• <tr id="yyy80"></tr>
  • <sup id="yyy80"></sup>
  • <tfoot id="yyy80"><noscript id="yyy80"></noscript></tfoot>
  • 99热精品在线国产_美女午夜性视频免费_国产精品国产高清国产av_av欧美777_自拍偷自拍亚洲精品老妇_亚洲熟女精品中文字幕_www日本黄色视频网_国产精品野战在线观看 ?

    Responses of Seed Yield and Economic Benefit of Winter Oilseed Rape(Brassica napus L.)to Different NPK Ratio and Dose

    2015-11-08 08:23:33YingziWANGChangTlANXuanZHOUWenmingWANGJianweiPENGZhenhuaZHANGHaixingSONGChunyunGUAN
    Agricultural Science & Technology 2015年11期

    Yingzi WANG,Chang TlAN,Xuan ZHOU,Wenming WANG,Jianwei PENG*,Zhenhua ZHANG,4,Haixing SONG,4*,Chunyun GUAN

    1.College of Resources and Environment,Hunan Agricultural University,Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use&Hunan Provincial Key Laboratory of Plant Nutrition in Common University&National Engineering Laboratory of College of Resources and Environment,Changsha 410128,China;

    2.College of Horticulture and Landscape,Hunan Agricultural University,Changsha 410128,China;

    3.College of Environmental Science and Resources,Zhejiang University,Hangzhou 310058,China;

    4.Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China,Changsha 410128,China;

    5.Hunan Branch,National Center of Oilseed Crops Improvement,Changsha 410128,China

    Responses of Seed Yield and Economic Benefit of Winter Oilseed Rape(Brassica napus L.)to Different NPK Ratio and Dose

    Yingzi WANG1,2,Chang TlAN1*,Xuan ZHOU3*,Wenming WANG1,Jianwei PENG1**,Zhenhua ZHANG1,4,Haixing SONG1,4*,Chunyun GUAN5

    1.College of Resources and Environment,Hunan Agricultural University,Hunan Provincial Key Laboratory of Farmland Pollution Control and Agricultural Resources Use&Hunan Provincial Key Laboratory of Plant Nutrition in Common University&National Engineering Laboratory of College of Resources and Environment,Changsha 410128,China;

    2.College of Horticulture and Landscape,Hunan Agricultural University,Changsha 410128,China;

    3.College of Environmental Science and Resources,Zhejiang University,Hangzhou 310058,China;

    4.Southern Regional Collaborative Innovation Center for Grain and Oil Crops in China,Changsha 410128,China;

    5.Hunan Branch,National Center of Oilseed Crops Improvement,Changsha 410128,China

    Field experiments were conducted during 2008-2010 to investigate the effects of NPK fertilization on seed yield and economic benefit of a new hybrid cultivar of winter oilseed rape (Brassica napus L.)-Xiangzayou763,and to determine the optimum NPK ratio and dose in Hunan,China.The results showed that NPK ratio (1∶0.50∶0.50)with 180 kg/hm2N,90 kg/hm2P2O5and 90 kg/hm2K2O was the optimum combination for the highest seed yield (2 231.13 kg/hm2)and economic benefit (9 816.97 Yuan/hm2),of which 1 641.23 Yuan/hm2being set for fertilizer investment (VCR=4.11).Besides,the effects of N,P and K fertilizers on seed yield and oil production of winter oilseed rape were not identical.N had the greatest effect on plant growth of winter oilseed rape,followed by P and K.Total leaf number,green leaf number,leaf length and width,rhizome diameter,branch number,dry weight per plant and other agronomic characters in high Ntreatments were higher than those in low N treatments.By correlation and path analysis of yield components,the contribution rate to seed yield was found:effective silique number per plant>seed number per silique>1 000-seed weight.

    NPK ratio and dose;Seed yield;Economic benefit;Winter oilseed rape

    O ilseed rape (Brassica napus L.)is a major oil crop and feed crop in China,and a promising biodiesel crop as well[1].Rape production among small holder farmers is important for its nutritional and income generation[2-3].As the largest economic crop in Hunan Province of China,oilseed rape is grown at least 10 000 km2per year[4].In recent years,with the development of technique of fertilization and breeding for oilseed rape,more attention has been paid to the breeding of new varieties of oilseed rape and its fertilization[5].However, oilseed rape which is grown at high density needs high inputs to ensure its production and quality.

    Nutrient management in soil on sustainable basis includes fertilizer types,amounts,time and methods of their application.Proper amount and time of fertilizer application is considered a key to the bumper crop[6].Wang et al.[7]found that,compared with no fertilizer,the scientific fertilization of NPK increased the seed yield of rape by 173.7%,much more than that of rice(46.7%),wheat(109.8%)and cotton(68.6%).And the results of 386 field experiments indicated that the reasonable combination of N,P and K significantly increased crop yield[8]. Thus,it is necessary to optimize the allocation of fertilizers for maximizing the yield of oilseed rape.Some researches had been done by Central China Agricultural University for oilseed rape growth in Hubei and Yangtze drainage area ofChina,which have recommended reasonable NPK ratio and dose[9-13].Results above have provided supports for scientific fertilization and technological generalization in oilseed rape production[1,14]. However,the reasonable applications of N,P and K have not been completely determined especially under different fields and production conditions.Therefore,the objective of this study is to determine the effect of different combinations of NPK on the seed yield of winter oilseed rape and recommend the optimal ratio and dose of NPK in Hunan of China,and provide theory basis for cultural technique system of a new good-quality and high-yield variety.

    Materials and Methods

    Site description

    The experimental site is situated at the experimental station of Yong'an Town,Liuyang City,Hunan Province,Central China.This region has a typical continental sub-tropical humid monsoon climate with an annual mean temperature of 17.3℃and an annual average rainfall of 1 171.6 mm.Thesoil,classified as a reddish yellow soil,evolved from the red earth platform of quaternary period.The main soil properties (0-20 cm depth)of this study site are described in Table 1.

    Materials

    Winter oilseed rape variety tested-Xiangzayou763,provided by the China National Grain and Oils Improvement Center of Hunan,was cropped after double-cropping rice(forecrop).Fertilizers were applied as urea (N 46%),calcium magnesium phosphate(P2O512%),potassium chloride (K2O 60%)and borax(B 11.3%).

    Experimental design

    Test Ⅰ:Keeping in view of the conventional fertilization amount,treatments with different NPK fertilizer combination were selected.The doses of N and P2O5were set for two levels-180,150 kg/hm2and 90,60 kg/hm2. The dose of K2O was set for three levels-210,158 and 105 kg/hm2.There were 12 different ratios of NPK treatments(Table 2).

    Test Ⅱ:To further confirm the reliability of Test Ⅰ,field trials with relatively higher content of available K were performed at the neighboring village. The amount of K2O was reduced to 90,120 and 150 kg/hm2,adding another level of N (210 kg/hm2)and P2O5(120 kg/hm2)(Table 3).

    Winter oilseed rape was transplanted in October 2008/2009 and harvested in May 2009/2010.In detail,25 day-old seedlings were transplanted to plots of 20 m2(4 m×5 m)each,separated with ditches of 20-25 cm deep,giving a population of 30 hills/m2.

    The treatments along with fertilizers applied are described in Table 2 and Table 3.Treatments were arranged according to completely randomized block design with three replications.50%N,60%K2O,100%P2O5and 100%B were applied as basal fertilizers by scattering at one time,20%N and 20%K2O as seedling fertilizer,30%N and 20%K2O as bolting fertilizer. Tillage,mechanical and chemical control of agricultural pests in the plantation were typical for this plant specie and consistent with the recommendations for protection.

    Sampling and analysis

    Plant samples were collected at maturity stage,and branch number, effective silique number,seed number,branch height and plant height were recorded.Seeds of each plot were harvested,oven-dried for 4 d at 60℃,and weighed to obtain seed yield.Oil content(%)was determined by taking 100 g cleaned seeds from each treatment,which were crushed and oil was extracted by soxlet method[15].

    Statistical analysis

    All the statistical analyses were performed by using the SPSS 17.0 package (SPSS,Chicago,IL,USA). Statistically significant differences were identified using analysis of variance (ANOVA);Duncan's Multiple Range Test was conducted to determine significant mean differences at 0.05 probability.

    Oil yield=Seed yield×Oil content;

    Seed output=Seed yield×Seed price;

    Fertilizer investment=N amount× N price+P2O5amount×P2O5price+ K2O amount×K2O price+B amount×B price.

    Seed and fertilizer price were seasonal prices.

    Table 1 Selected physico-chemical properties of the soil

    Table 2 Experimental treatments showing all possible combination of NPK for TestⅠkg/hm2

    Results and Analysis

    Seed yield

    The seed yield of winter oilseed rape showed significant response to the various combinations of NPK fertilization (P<0.05;Fig.1 and Fig.2).A-mong the treatments in Test Ⅰ,Treatment 1 had the highest seed yield(1 829.99 kg/hm2),followed by Treatment 2(1 800.47 kg/hm2).Compared with CK,Treatment 1 and Treatment 2 increased the seed yield by 1 394.57 and 1 365.05 kg/hm2,respectively.Under the same dose of P and K,the seed yield in high N treatments(Treatment 1-Treatment 6)were higher than those in low N treatments(Treatment 7-Treatment 12),above 1 680kg/hm2(P<0.05).Besides,P displayed the similar trend,namely the seed yield in high P treatments(Treatment 1-Treatment 3 and Treatment 7-Treatment 9)were also higher than those in low P treatments(Treatment 4-Treatment 6 and Treatment 7-Treatment 9),while K did not.

    Table 3 Experimental treatments showing all possible combination of NPK for Test Ⅱ kg/hm2

    In Test Ⅱ,Treatment B had the highest seed yield (2 231.13 kg/hm2),which was obviously higher than other treatments(P<0.05),followed by Treatment G(2 065.26 kg/hm2),which was obviously higher than Treatment D,Treatment F and CK(P<0.05).And the lowest seed yield of NPK treatments was in Treatment F,1 608.23 kg/hm2.Under the same dose of P and K,the seed yield increased along with N(e.g.Treatment A,Treatment F and Treatment G),while P was consistently(e.g.Treatment A,Treatment D and Treatment E).The seed yield did not increase by applying more K,and even decreased instead (e.g.Treatment A,Treatment B and Treatment C).Results indicated that the responses of winter oilseed rape in seed yield followed the order of N>P>K.

    In conclusion,under the same P and K level increasing N or under the same N and K level increasing P,both raised the seed yield of winter oilseed rape in two-year test.In Test Ⅰ and Ⅱ,Treatment 1(1:0.5:0.58),Treatment 2(1:0.5:0.88),Treatment5 (1:0.33: 0.88),Treatment B (1:0.50:0.50)and Treatment G (1:0.43:0.57)were the optimum treatments in the seed yield. Although the volume variances for these treatments were not significant(P>0.05),the best NPK combination of two-year experiment was obtained as 1:0.50:0.50,with 180 kg/hm2N,90 kg/hm2P2O5,90 kg/hm2K2O based on the reduction of K application.

    Correlation and path analysis of yield and its components

    Taking effective siliques number per plant(X1),seed number per silique(X2)and 1 000-seed weight(X3)as the independent variables,and seed yield(Y)as dependent variable,correlation analysis and path analysis of two-year experiment,multivariate regression analysis were performed to establish a regression equation of three components on seed yield as below.

    Y=-3 425.56+45.66X1+33.14X2+ 236.22X3(F=78.22**,R=0.9814)TestI;

    Y'= -2 580.94+8.56X1'+ 109.50X2'+359.55X3'(F=20.98**,R= 0.969 7)Test Ⅱ.

    Correlation analysis and path analysis of two-year experiment(Fig. 3:Test Ⅰ,F(xiàn)ig.4:Test Ⅱ)on the three yield components and seed yield were performed.In the two-year experiment,the coefficient of efficient siliques number per plant was the highest in either path coefficient or correlation coefficient(P<0.01),indicated that a certain number of effective siliques per plant was the foundation of winter oilseed rape for high yield.Besides,the path coefficient of 1 000-seed weight was higher than that of seed number per silique,while the correlation coefficients in TestⅠdisplayed negative value(-0.279),which needs further study to confirm.

    The three yield components effective silique number per plant,seed number per silique and 1 000-seed weight existed significant interaction mutually(P<0.05).It indicated that the seed numbers per silique could had an indirect effect on the seed yield by silique number per plant.

    Consequently,it was suitable to increase the seed yield by improvement of silique number per plant.This fact indirectly emphasized the importance of the period from the stage of eargrowth to the stage of seed growth,which was decisive for final formation of the seed yield.Of yield components,it was further confirmed that effective silique number per plant had the greatest effect on seed yield,followed by 1 000-seed weight and seed number per silique.

    Oil yield

    In Test Ⅰ,the maximum oil yield of winter oilseed rape at harvest(Fig.5)was achieved by Treatment 2(7 37.61 kg/hm2),followed by Treatment 1(737.21 kg/hm2).In Test Ⅱ,the maximum oil yield of winter oilseed rape at harvest (Fig.2)was achieved by Treatment B(938.25 kg/hm2),followed by Treatment G(737.21 kg/hm2).Therewere no significant differences among these treatments in oil content(40.40%-41.70%)like seed yield(P>0.05).And high N treatments(40.40%-40.90%)were lower in oil content than those of low N treatments (41.13%-41.70%).Namely high N treatments had higher seed yield,but relatively lower oil content.As shown in Test Ⅱ(Fig.6),Treatment B had the highest oil yield (938.25 kg/hm2),followed by Treatment G (869.96 kg/hm2).Within the range of oil content (41.93%-42.96%),oil yield had the similar trend with seed yield.

    In conclusion,the trend of oil production in general depended on seed yield.For oil content differed slightly among these treatments,and there was a decrease in oil content with N ratio increasing.Zhao et al.[16]found a similar result,namely with the increase of N application rate,oil content very significantly decreased,oil content would be reduced by 0.21%-0.24% with N increasing by every 1 kg.Thus,oil yield and seed yield had the same trend,and the differences of oil yield in each treatment were not so obvious as seed yield.

    Table 4 Economic benefits of winter oilseed rape(Test Ⅰ) Yuan/hm2

    Economic benefit

    The statistical analysis showed that economic benefit was significantly affected by different NPK treatments(P<0.05;Table 4 and Table 5).In Test Ⅰ,the seed output of winter oilseed rape in Treatment 1 was the highest(7 319.96 Yuan/hm2)(Table 4).After deducting the fertilizer investment,of which fertilizer efficiency also achieved maximum,3 905.26 Yuan/hm2(VCR= 2.33),followed by Treatment 4(VCR= 2.25).According to the actual situation of China's agricultural production,the fertilizer application in VCR>2.0 had remarkable economic benefits[14].On the other hand,the higher economic benefit was obtained in the treatments with lower K application,indicated that K had a certain influence on the VCR. By analyzing the economic benefit,we found that Treatment 1 (1∶0.5∶0.58)was the most suitable ratio of NPK. In Test Ⅱ,the seed output in Treatment B was9816.97Yuan/hm2(Table 5)with the lowest fertilizer investment 1 641.23 Yuan(VCR=4.11),followed by Treatment A,of which fertilizer efficiency amounted to 5 572.78 Yuan/hm2,and VCR surpassed 2.0(P<0.05).As a consequence of economic benefit,Treatment B achieved the highest seed output and VCR for the lowest fertilizer investment.

    Table 5 Economic benefits of winter oilseed rape(Test Ⅱ) Yuan/hm2

    Discussion

    Nitrogen is considered as major element of fertilizer for high yield and closely linked to the control of vegetative growth of plant and hence determines the fate of reproductive cycle. Phosphorous is required in a smaller amount than nitrogen for plant growth and equally important for crop growth. Potassium is also required in a large amount by crop.NPK fertilization exerted a significantly higher and positive effect on yield oof maize and oilseed rape as compared with winter wheat and spring barley[17].Higher yield per unit area can be achieved by adopting modern cultural practices with better nutrient management.Hence,the rapid growth of fertilizer input still has great potentiality for sustained agricultural production in China.Balanced application of N,P and K is considered as a guarantee of rational supply of essential nutrients for normal growth to sustain crop yield,increase fertilizer use efficiency and restore soil fertility under intensive cropping[18].

    Normally,it was needed to produce 100 kg oilseed with 10 kg N,3.6 kg P2O,11 kg K2O and 1.0 kg B in Hunan,China[19].In Test Ⅰ,we found that Treatment 1 (1∶0.50∶0.58)with 180 kg/hm2N,90 kg/hm2P2O5and 105 kg/hm2K2O was the optimum ratio and dose for seed yield by reducing K application.On the other hand,it was further confirmed by Treatment B in Test Ⅱ.The researches in Jiangxi suggested that the application of K(90 kg/hm2)in a reasonable range could be recommended to properly reduce the whole application of NPK[20].Due to the development of straw returning,K deficiency in soil for winter oilseed rape was largely alleviated in the Yangtze River area[21].Moreover,to soil rich in K,applying more K would decrease the content of available Mg due to nutrient antagonism,resulting in a considerable reduction in production[22].Most researches found N and P were the main nutrition elements affecting crop yield,followed by K[7,23-24],while the influence of K application is minimal.Sun et al.[25]showed that with K application increasing,the seed yield conformed to parabolic model by the optimum amount of K at 135 kg/hm2in field,which was consistent with our results.Thus more studies are needed to determine K application combined with seed quality in the future.

    Under the same ratio of P and K,high N treatments in total leaf number,green leaf number,leaf length and width,rhizome diameter,dry weight per plant and other agronomic characters were higher than those in low N treatments(Data not shown).It indicated that the suitable ratio of NPK could improve the formation of agronomic characters to promote production[26]. Szczepaniak et al.[17]suggested that seed number per plant was a more sensitive component of yield structure response to balanced supply of basic nutrients than 1 000-seeds weight.In the test,the maximum correlation was between siliques number per plant and seed yield,followed by seed number per silique and1 000-seeds weight.

    The oil production was calculated on the basis of the determined oil content and the seed production[27].According to economic benefit of twoyear test,in Test Ⅰ,the fertilizer efficiencies of Treatment 1 (1∶0.5∶0.58)and Treatment 4 (1∶0.33∶0.58)were significantly obvious(P<0.05),and the seed output and VCR of Treatment 1 were higher than those of other treatments.In Test Ⅱ,the seed output of Treatment A(1∶0.50∶0.67)and Treatment B(1∶0.50∶0.50)were significantly obvious(P<0.05).Due to higher K application,the fertilizer efficiency of Treatment A was lower than that of Treatment B by 1 168.56 Yuan/hm2. Analyzing the results of the two-year experiment,in Test Ⅱ Treatment B(1∶0.50:0.50)with 180 kg/hm2N,90 kg/hm2P2O5and 90 kg/hm2K2O was the most appropriate ratio and dose of NPK.

    It could be conducted that Treatment 1 has the best NPK combination among the treatments for it produced similar seed yield but required lower K application compared with other treatments.Therefore,the combination of N,P,K and B fertilizers is a generally recommended technique in oilseed rape production in Hunan,China.Simultaneously,the economic profit from fertilizers would be reducing because the price of fertilizers has risen greatly in recent years[28].In this regard,we suggest that one element nutrient will be tentatively reduced or even deducted from the total fertilizers if it is relatively abundant in soil.For instance,the application of K fertilizer can be lessened or ignored during some periods in the areas with high available K in soil. Moreover,the fertilization thresholds under different yield levels in various ecosystems and soil fertlity need further studies to conduct precise fertilization in the future.

    Conclusion

    (1)The NPK combination of Treatment B seemed to be the optimum dose and ratio in terms of maximum seed yield(2 231.13 kg/hm2)and oil yield(938.25 kg/hm2)in Hunan,and the methods of N application hadgreatest influence on seed yield and oil yield of winter oilseed rape,followed by P and K.

    (2)Of yield components,the contribution rate to seed yield was further confirmed that:effective silique number per plant>1 000-seed weight>seed number per silique.

    (3)The NPK ratio(1∶0.50∶0.50)of the tested treatments with 180 kg/hm2N,90 kg/hm2P2O5and 90 kg/hm2K2O in the seed output amounted to a maximum of 9 816.97 Yuan/hm2,with the lowest fertilizer investment(VCR= 4.11).Considering all,it is the optimum combination for plant growth of winter oilseed rape.

    [1]TU JX,ZHANG DX,ZHANG Y,et al. Discussion on some standards of variety registration and breeding goals of Brassica napus in China[J].Chinese Journal of Oil Crop Sciences,2007,29(3):350-352.

    [2]FAO.Agriculture,food and nutrition for Africa:A resource book for teachers of agriculture[M].Rome:FAO Publishing Managerial Group,1997.

    [3]ACQUAAH.Horticulture:principles and practices[M].New Jersey:Pearson Education,2005.

    [4]HUANG FL.Comparison of Xiangzayou 5 with major rapeseed cultivars commercially released in Hunan Province[J].Crop Research,2004,(1):22-24.

    [5]LOU YS,LIANG YC,YANG Y,et al.Effect of fertilization on plant growth and nutrient uptake in oilseed rape under varying boron supply[J].Communications in Soil Science&Plant Analysis,2003,34(7):1059-1075.

    [6]AFRIDI MZ,JAN MT,SHAD AA.Some aspects of NPK nutrition for improved yield and oil contents of canola[J]. Asian Journal of Plant Sciences,2002,(5):507-509.

    [7]WANG RQ,YANG GZ,SHI QS,et al. Effects of the mixed application of N,P,K,Mg,Zn on oil and protein yield of rapeseed(Brassica napus L.)[J].Hubei Agricultural Sciences,2009,48 (5): 1096-1100.

    [8]WANG WN,LU JW,REN T,et al.Inorganic fertilizer application ensures high crop yields in modern agriculture:A large-scale field case study in Central China[J].Journal of Food Agriculture and Environment,2012,10(2):703-709.

    [9]LU JW,CHEN F,YU CB,et al.Response of rapeseed yield to K application and primary study of soil critical available K content for rapeseed[J]. Chinese Journal of Oil Crop Sciences,2003,25(4):107-112.

    [10]LU MX,ZOU J,LU JW,et al.Study on response of rapeseed to P application and classification criterion for available P in the soil[J].Chinese Journal of Oil Crop Sciences,2006,28(4):448-452.

    [11]LI YS,LU JW,ZOU J,et al.Study on response to potassium(K)application and recommendation of optimalK rates for rapeseed in Hubei[J].Chinese Journal of Oil Crop Sciences,2008,30(4):469-475.

    [12]LI YS,LU JW,ZOU J,et al.Study on effect of nitrogen application and recommendation of optimal N application for rapeseed in Hubei[J].Chinese Journal of Oil Crop Sciences,2008,30(2):218-223.

    [13]LI YS,LU JW,ZOU J,et al.Response to phosphorus application and effective P application for rapeseed in Hubei[J].Chinese Journal of Oil Crop Sciences,2009,31(1):44-45.

    [14]ZOU J,LU JW,CHEN F,et al.Increasing yield and profit of rapeseed under combined fertilization of nitrogen,phosphorus,potassium,and boron in Yangtze River Basin[J].Acta Agronomica Sinica,2009,35(1):87-92.

    [15]BAO SD.Analysis method for soil agrochemistry[M].Beijing:Agricultural Publishing House of China,2005.

    [16]ZHAO JX,CHENG GP,REN TB,et al. Effect of different nitrogen rates on yield and quality parameters of high grade yellow seed hybrid rape[J].Plant Nutrition&Fertilizer Science,2007,13(5):882-889.

    [17]SZCZEPANIAK W,BAR?óG P,?UKOWIAK R,et al.Effect of balanced nitrogen fertilization in four-year rotation on plant productivity [J].Journal of Central European Agriculture,2013,14(1):64-77.

    [18]YADAV RL.Assessing on-farm efficiency and economics of fertilizer N,P and K in rice wheat systems of India[J].Field Crops Research,2003,81(1): 39–51.

    [19]GUAN CY.Good quality and high yield cultivation technique ofrape [M]. Changsha:Hunan Science and Technology Publishing House,1992.

    [20]ZOU XY,CHEN LL,LI SY,et al.Effect of nitrogen,phosphorus,potassium,and boron fertilizers on yield and profit of hybrid rapeseed(Brassica napus L.)[J].Scientia Agricultura Sinica,2011,44(5):917-924.

    [21]ZHANG FS,CUI ZL,WANG JQ,et al. Current status of soil and plant nutrient management in China and improvement strategies[J].Chinese Bulletin of Botany,2007,24(6):687-694.

    [22]LIU DB,CHEN F,LU JW,et al.Effect of K Application on dry matter accumulation and absorption of K,Ca and Mg of oil rape [J].Soils&Fertilizers,2001,(4):24-28.

    [23]LI ZY,HU Q,LIAO X,et al.Effects of nitrogen,phosphorus and boron on the yield and quality of high-efficient oilseed rape hybrid Zhongyouza No.8[J].Chinese Journal of Oil Crop Sciences,2005,27(4):59-63.

    [24]ZOU J,LU JW,LI YS,et al.Study on the effects of NPK fertilizers and optimum fertilizer rate on direct-seeding rapeseed [J].Chinese Journal of Oil Crop Sciences,2008,30(1):90-94.

    [25]SUN KG,WANG YL,LU ZJ,et al. Study on nutritional character of rape and potassium fertilizer application effect[J].Soils&Fertilizers,2002,(4): 35-37.

    [26]SONG X,LIU FL,ZHENG PY,et al. Correlation analysis between agronomic traits and yield of rapeseed(Brassica napus L.)for high-density planting[J].Scientia Agricultura Sinica,2010,43(9):1800-1806.

    [27]GROSZ D.The influence of the fertilization upon the oil content and production on one assortment of the rape varieties[J].Research Journal of Agricultural Science,2009,41(1):27-30.

    [28]SABAHI H,GHALAVAND A,SANAVY SAMM.Impacts of fertilization systems on nitrogen loss and yield of oilseed rape (Brassica napus L.)[J].Pakistan Journal of Biological Sciences,2008,11(2):232-237.

    Responsible editor:Qingqing YlN

    Responsible proofreader:Xiaoyan WU

    Supported by the Youth Fund of Orient Science and Technology College,Hunan Agricultural University(14QNZ09);Cultivation Physiology Station of National Technical System in Rape Industrial,National Key Technology Support Program(2012BAD15B04,2010BAD01B01);Special Fund of Government in Hunan Province,National Natural Science Foundation of China(31071851,31101596,3132130);Open Fund Project of Innovation Platform in Colleges and Universities of Hunan Province(12K064).

    *These authors contributed equally to this work.

    **Corresponding author.E-mail:jwpngpd@sina.com,shx723@126.com Received:August 18,2015 Accepted:October 10,2015

    91精品三级在线观看| 亚洲 欧美一区二区三区| 精品一区二区三区av网在线观看| 又紧又爽又黄一区二区| 一区二区日韩欧美中文字幕| 欧美激情高清一区二区三区| 三级毛片av免费| 淫妇啪啪啪对白视频| 亚洲精品一卡2卡三卡4卡5卡| 村上凉子中文字幕在线| 免费女性裸体啪啪无遮挡网站| 后天国语完整版免费观看| 日本三级黄在线观看| 亚洲自偷自拍图片 自拍| 国产深夜福利视频在线观看| 久久久水蜜桃国产精品网| 桃红色精品国产亚洲av| 制服人妻中文乱码| 国产精品98久久久久久宅男小说| av视频免费观看在线观看| 免费观看人在逋| 欧美日韩福利视频一区二区| 久久国产亚洲av麻豆专区| 欧美日韩国产mv在线观看视频| 成年版毛片免费区| 妹子高潮喷水视频| 一a级毛片在线观看| 极品教师在线免费播放| 国产97色在线日韩免费| 亚洲av片天天在线观看| 欧美日本亚洲视频在线播放| 国产av精品麻豆| 国产极品粉嫩免费观看在线| 看黄色毛片网站| 欧美日韩亚洲高清精品| 成人免费观看视频高清| 色婷婷av一区二区三区视频| 9191精品国产免费久久| 天天躁夜夜躁狠狠躁躁| 亚洲精品国产色婷婷电影| 高潮久久久久久久久久久不卡| 欧美成人午夜精品| 男女床上黄色一级片免费看| 大陆偷拍与自拍| 亚洲精品粉嫩美女一区| 最新美女视频免费是黄的| 性少妇av在线| 国产成人啪精品午夜网站| 91大片在线观看| 亚洲色图综合在线观看| 韩国av一区二区三区四区| 国产乱人伦免费视频| 色老头精品视频在线观看| 国产精品成人在线| 亚洲国产欧美一区二区综合| 日本a在线网址| 国产一区二区激情短视频| 国产欧美日韩精品亚洲av| 一a级毛片在线观看| 亚洲视频免费观看视频| 免费高清视频大片| 中文字幕人妻丝袜制服| 色精品久久人妻99蜜桃| 国产av又大| 国产欧美日韩综合在线一区二区| 99久久精品国产亚洲精品| 高清av免费在线| 久久国产精品人妻蜜桃| 91精品国产国语对白视频| 亚洲一区中文字幕在线| 亚洲精品国产区一区二| 日本五十路高清| 久久久久久大精品| 国产亚洲欧美98| 亚洲欧美一区二区三区久久| 精品一区二区三卡| 一级,二级,三级黄色视频| 黑人猛操日本美女一级片| 日韩精品中文字幕看吧| 国产真人三级小视频在线观看| 国产精品av久久久久免费| 97超级碰碰碰精品色视频在线观看| 亚洲av片天天在线观看| 80岁老熟妇乱子伦牲交| 久久久久国内视频| 亚洲情色 制服丝袜| 亚洲成人久久性| 啦啦啦 在线观看视频| 亚洲人成电影免费在线| 欧美 亚洲 国产 日韩一| 一级a爱片免费观看的视频| cao死你这个sao货| 久久久久久久久免费视频了| 久久欧美精品欧美久久欧美| 国产成人精品无人区| 亚洲精品国产一区二区精华液| 9热在线视频观看99| 婷婷六月久久综合丁香| 久久性视频一级片| 亚洲精品久久午夜乱码| 丁香欧美五月| 99国产精品一区二区蜜桃av| 国产精品一区二区免费欧美| 99久久人妻综合| 中文字幕人妻丝袜制服| 国产日韩一区二区三区精品不卡| 日韩欧美国产一区二区入口| 香蕉丝袜av| 精品欧美一区二区三区在线| 激情视频va一区二区三区| 亚洲久久久国产精品| 一级作爱视频免费观看| 亚洲自偷自拍图片 自拍| 亚洲片人在线观看| 嫁个100分男人电影在线观看| 国产精品一区二区在线不卡| 嫩草影视91久久| 大陆偷拍与自拍| 老司机福利观看| 黄色成人免费大全| 国产一区二区在线av高清观看| 精品国产一区二区久久| 美女国产高潮福利片在线看| 亚洲视频免费观看视频| 国产精品美女特级片免费视频播放器 | 欧美日韩视频精品一区| 国产成人免费无遮挡视频| 成人国产一区最新在线观看| 51午夜福利影视在线观看| 美女扒开内裤让男人捅视频| 一级黄色大片毛片| videosex国产| 精品欧美一区二区三区在线| 999久久久精品免费观看国产| 国产黄a三级三级三级人| 美女 人体艺术 gogo| 精品久久久精品久久久| 99热只有精品国产| 国产成人欧美在线观看| 亚洲人成网站在线播放欧美日韩| 国产亚洲欧美在线一区二区| 亚洲精品国产一区二区精华液| 黄网站色视频无遮挡免费观看| 国产三级黄色录像| 免费久久久久久久精品成人欧美视频| 日本免费一区二区三区高清不卡 | 亚洲人成伊人成综合网2020| 国产精品99久久99久久久不卡| 天堂动漫精品| 精品久久蜜臀av无| 欧美日韩黄片免| 国产精品自产拍在线观看55亚洲| 高清在线国产一区| 韩国精品一区二区三区| 色精品久久人妻99蜜桃| 国产熟女xx| 日本欧美视频一区| 99在线视频只有这里精品首页| 女人爽到高潮嗷嗷叫在线视频| 午夜a级毛片| 桃红色精品国产亚洲av| 美国免费a级毛片| 一区福利在线观看| 99久久国产精品久久久| 久久国产精品影院| 黑丝袜美女国产一区| 久久久国产一区二区| 中文亚洲av片在线观看爽| 成年人免费黄色播放视频| aaaaa片日本免费| 热99国产精品久久久久久7| 村上凉子中文字幕在线| 中文字幕人妻丝袜一区二区| 欧美乱色亚洲激情| 又黄又粗又硬又大视频| 国产精品亚洲一级av第二区| 亚洲国产看品久久| 叶爱在线成人免费视频播放| 午夜老司机福利片| 99精品在免费线老司机午夜| 亚洲成人免费电影在线观看| 日韩欧美一区二区三区在线观看| 51午夜福利影视在线观看| 欧美丝袜亚洲另类 | 80岁老熟妇乱子伦牲交| 亚洲黑人精品在线| 精品一区二区三区av网在线观看| avwww免费| tocl精华| 亚洲av五月六月丁香网| 久久精品人人爽人人爽视色| 久久影院123| 韩国精品一区二区三区| 久久性视频一级片| 曰老女人黄片| 欧美黄色片欧美黄色片| 成熟少妇高潮喷水视频| 亚洲国产欧美日韩在线播放| 视频在线观看一区二区三区| av国产精品久久久久影院| 亚洲成人精品中文字幕电影 | 美国免费a级毛片| 18禁国产床啪视频网站| 少妇的丰满在线观看| 久热爱精品视频在线9| 国产一区二区激情短视频| 亚洲男人的天堂狠狠| 国产视频一区二区在线看| 亚洲精品一区av在线观看| 中文字幕色久视频| 69av精品久久久久久| 国产精品亚洲av一区麻豆| 欧美乱码精品一区二区三区| 天天躁夜夜躁狠狠躁躁| 久久精品亚洲精品国产色婷小说| 成人影院久久| 看片在线看免费视频| 大型黄色视频在线免费观看| 女生性感内裤真人,穿戴方法视频| 大香蕉久久成人网| 丰满迷人的少妇在线观看| 精品福利观看| 99久久人妻综合| av视频免费观看在线观看| 欧美成人性av电影在线观看| 国产在线精品亚洲第一网站| 天天影视国产精品| 女警被强在线播放| 亚洲精品中文字幕在线视频| 一边摸一边抽搐一进一小说| 色老头精品视频在线观看| 亚洲精品国产精品久久久不卡| 91麻豆av在线| 国产精品影院久久| 久9热在线精品视频| 手机成人av网站| 久久香蕉国产精品| 人人澡人人妻人| 新久久久久国产一级毛片| 大香蕉久久成人网| 一级a爱视频在线免费观看| 精品久久久久久久毛片微露脸| 色尼玛亚洲综合影院| 国产视频一区二区在线看| 免费av毛片视频| 免费搜索国产男女视频| 丰满迷人的少妇在线观看| 国产精品影院久久| 日韩视频一区二区在线观看| 欧美日韩福利视频一区二区| 免费一级毛片在线播放高清视频 | 可以在线观看毛片的网站| 欧美激情久久久久久爽电影 | 欧美日韩视频精品一区| 精品少妇一区二区三区视频日本电影| 18禁美女被吸乳视频| 国产在线精品亚洲第一网站| 欧美午夜高清在线| 很黄的视频免费| 一边摸一边做爽爽视频免费| 亚洲五月天丁香| 欧美日韩国产mv在线观看视频| 亚洲久久久国产精品| 校园春色视频在线观看| 午夜影院日韩av| 亚洲一卡2卡3卡4卡5卡精品中文| 国产视频一区二区在线看| 18禁美女被吸乳视频| 真人做人爱边吃奶动态| 成年人免费黄色播放视频| 丰满人妻熟妇乱又伦精品不卡| 久久久国产欧美日韩av| 99精品久久久久人妻精品| 欧美日韩精品网址| 在线看a的网站| 在线观看免费高清a一片| 久久天堂一区二区三区四区| 亚洲精品国产一区二区精华液| 99久久人妻综合| 日韩高清综合在线| 午夜激情av网站| 国产免费现黄频在线看| 日韩大尺度精品在线看网址 | 亚洲av第一区精品v没综合| av国产精品久久久久影院| 日韩欧美一区视频在线观看| 精品久久蜜臀av无| 最好的美女福利视频网| 在线观看免费午夜福利视频| 在线观看www视频免费| 精品免费久久久久久久清纯| 欧美日韩国产mv在线观看视频| 欧美黄色片欧美黄色片| 国内久久婷婷六月综合欲色啪| 成人国产一区最新在线观看| 久久精品亚洲av国产电影网| 老熟妇乱子伦视频在线观看| 大陆偷拍与自拍| 亚洲情色 制服丝袜| av在线播放免费不卡| 精品无人区乱码1区二区| 亚洲欧美激情在线| 夜夜爽天天搞| 日韩国内少妇激情av| 琪琪午夜伦伦电影理论片6080| 国产精品永久免费网站| 男女做爰动态图高潮gif福利片 | 亚洲精品久久午夜乱码| 12—13女人毛片做爰片一| 成人亚洲精品一区在线观看| 亚洲成国产人片在线观看| 色播在线永久视频| 国产精品亚洲一级av第二区| 精品久久久久久成人av| 精品少妇一区二区三区视频日本电影| 亚洲第一青青草原| 黄片大片在线免费观看| 亚洲va日本ⅴa欧美va伊人久久| 1024香蕉在线观看| 欧美丝袜亚洲另类 | 黄色视频不卡| 最新在线观看一区二区三区| 久久精品亚洲熟妇少妇任你| 黄色女人牲交| 老汉色av国产亚洲站长工具| 亚洲欧美激情综合另类| 欧美国产精品va在线观看不卡| 亚洲片人在线观看| 国产色视频综合| 精品久久久精品久久久| 久久精品国产亚洲av香蕉五月| 中亚洲国语对白在线视频| 国产精品永久免费网站| 午夜视频精品福利| 日韩三级视频一区二区三区| aaaaa片日本免费| 韩国av一区二区三区四区| 亚洲精品在线美女| 欧美日本中文国产一区发布| 黄色片一级片一级黄色片| 色综合婷婷激情| 国产不卡一卡二| x7x7x7水蜜桃| 国产精品免费视频内射| 90打野战视频偷拍视频| 色尼玛亚洲综合影院| 日本五十路高清| 国产精品偷伦视频观看了| 99国产精品99久久久久| 日韩欧美一区二区三区在线观看| 性少妇av在线| 亚洲一区二区三区色噜噜 | 亚洲av成人一区二区三| 国产免费av片在线观看野外av| 精品国产一区二区久久| 国产视频一区二区在线看| 亚洲欧美一区二区三区黑人| 亚洲色图综合在线观看| 欧美老熟妇乱子伦牲交| 日本vs欧美在线观看视频| 美女国产高潮福利片在线看| 久久久久久大精品| 午夜久久久在线观看| 波多野结衣高清无吗| 亚洲精华国产精华精| 一级毛片精品| 丰满的人妻完整版| 精品国产一区二区久久| 757午夜福利合集在线观看| 90打野战视频偷拍视频| 黄色丝袜av网址大全| 久久欧美精品欧美久久欧美| 国产成人影院久久av| 欧美最黄视频在线播放免费 | 亚洲精品粉嫩美女一区| 熟女少妇亚洲综合色aaa.| 欧美成人午夜精品| 亚洲av日韩精品久久久久久密| 国产亚洲欧美98| 欧美精品啪啪一区二区三区| 国产又色又爽无遮挡免费看| 又大又爽又粗| 丁香六月欧美| 免费在线观看影片大全网站| 一夜夜www| 国产aⅴ精品一区二区三区波| 男人舔女人的私密视频| 国产成人精品无人区| 黄片播放在线免费| 日韩精品青青久久久久久| 免费搜索国产男女视频| 男男h啪啪无遮挡| 久热这里只有精品99| 精品欧美一区二区三区在线| 18禁观看日本| av超薄肉色丝袜交足视频| 午夜免费鲁丝| 在线观看免费视频网站a站| 国产精品美女特级片免费视频播放器 | 中文字幕人妻丝袜制服| av国产精品久久久久影院| 日韩欧美一区二区三区在线观看| xxx96com| 日本黄色日本黄色录像| 亚洲av片天天在线观看| 欧美激情高清一区二区三区| 在线十欧美十亚洲十日本专区| 99国产精品一区二区蜜桃av| 国产亚洲av高清不卡| 两性夫妻黄色片| 少妇粗大呻吟视频| 夜夜夜夜夜久久久久| 亚洲美女黄片视频| 午夜成年电影在线免费观看| 一区二区日韩欧美中文字幕| 国产精品一区二区免费欧美| 国产精品日韩av在线免费观看 | 亚洲全国av大片| 99久久精品国产亚洲精品| 级片在线观看| 黑人巨大精品欧美一区二区蜜桃| 久9热在线精品视频| 午夜两性在线视频| 国产极品粉嫩免费观看在线| 精品久久久久久,| 高清av免费在线| 国产精品国产av在线观看| 久久伊人香网站| 日韩精品免费视频一区二区三区| 老司机午夜十八禁免费视频| 91九色精品人成在线观看| 黄色毛片三级朝国网站| 国产精品久久久av美女十八| 成年人黄色毛片网站| 韩国av一区二区三区四区| 黄色女人牲交| 国产97色在线日韩免费| 丝袜人妻中文字幕| 无限看片的www在线观看| 免费女性裸体啪啪无遮挡网站| 又黄又爽又免费观看的视频| 视频在线观看一区二区三区| 国产高清视频在线播放一区| 亚洲一区高清亚洲精品| 国产免费av片在线观看野外av| 91老司机精品| 嫩草影院精品99| 老司机深夜福利视频在线观看| 高清黄色对白视频在线免费看| 麻豆成人av在线观看| 在线观看免费日韩欧美大片| 黑人巨大精品欧美一区二区蜜桃| 欧美一级毛片孕妇| 亚洲视频免费观看视频| 久久国产亚洲av麻豆专区| 91av网站免费观看| av免费在线观看网站| 男人的好看免费观看在线视频 | 久久性视频一级片| 婷婷精品国产亚洲av在线| 精品日产1卡2卡| av视频免费观看在线观看| 人人妻人人添人人爽欧美一区卜| 久久久久久大精品| 手机成人av网站| 欧美乱妇无乱码| 自线自在国产av| 91麻豆av在线| 欧美黑人欧美精品刺激| 午夜日韩欧美国产| 香蕉丝袜av| 变态另类成人亚洲欧美熟女 | av国产精品久久久久影院| 国产精品自产拍在线观看55亚洲| 九色亚洲精品在线播放| 成人黄色视频免费在线看| av天堂在线播放| www.精华液| 免费高清视频大片| 亚洲自偷自拍图片 自拍| 国产黄色免费在线视频| 欧美+亚洲+日韩+国产| 国产单亲对白刺激| 99热只有精品国产| 久久精品国产综合久久久| 久久99一区二区三区| 亚洲欧美激情在线| 日韩一卡2卡3卡4卡2021年| 巨乳人妻的诱惑在线观看| 正在播放国产对白刺激| 成年人免费黄色播放视频| 看片在线看免费视频| 久久精品国产亚洲av高清一级| 水蜜桃什么品种好| 久久久国产成人免费| 亚洲欧美日韩无卡精品| 亚洲精品国产色婷婷电影| 女性生殖器流出的白浆| 欧美日韩精品网址| 在线观看免费午夜福利视频| 亚洲国产看品久久| 国产99久久九九免费精品| 一夜夜www| 天堂俺去俺来也www色官网| 亚洲欧美激情综合另类| 丰满的人妻完整版| 亚洲午夜理论影院| 1024视频免费在线观看| 亚洲全国av大片| 亚洲欧美精品综合久久99| 国产亚洲精品第一综合不卡| 久久精品亚洲av国产电影网| 久久中文看片网| 校园春色视频在线观看| 国产在线观看jvid| 日韩一卡2卡3卡4卡2021年| 日韩免费av在线播放| 99香蕉大伊视频| 欧美亚洲日本最大视频资源| 如日韩欧美国产精品一区二区三区| 少妇粗大呻吟视频| 在线观看日韩欧美| ponron亚洲| 69精品国产乱码久久久| 又黄又爽又免费观看的视频| 午夜亚洲福利在线播放| 香蕉久久夜色| 国产成人精品在线电影| 色播在线永久视频| 国产伦人伦偷精品视频| 9191精品国产免费久久| 国产一区二区激情短视频| 久久 成人 亚洲| 亚洲熟妇熟女久久| 脱女人内裤的视频| 久久精品影院6| 成人18禁高潮啪啪吃奶动态图| 亚洲成人国产一区在线观看| 最新美女视频免费是黄的| 黄色女人牲交| 国产精品野战在线观看 | 亚洲专区字幕在线| 香蕉国产在线看| 搡老岳熟女国产| 精品国产乱子伦一区二区三区| 中文字幕另类日韩欧美亚洲嫩草| 黄网站色视频无遮挡免费观看| 国产区一区二久久| 精品乱码久久久久久99久播| av电影中文网址| 欧美精品一区二区免费开放| 亚洲成人免费av在线播放| 最新美女视频免费是黄的| 91av网站免费观看| 色哟哟哟哟哟哟| 黄色片一级片一级黄色片| 新久久久久国产一级毛片| 麻豆国产av国片精品| av天堂久久9| 99热只有精品国产| 久久久久久久久中文| 日日干狠狠操夜夜爽| 欧美成人午夜精品| 99在线视频只有这里精品首页| 三上悠亚av全集在线观看| 精品久久久久久电影网| 最好的美女福利视频网| 婷婷丁香在线五月| 在线观看免费视频网站a站| 中文字幕最新亚洲高清| 亚洲成av片中文字幕在线观看| 日日夜夜操网爽| 久久中文字幕一级| 日韩精品中文字幕看吧| 18美女黄网站色大片免费观看| 午夜两性在线视频| 精品国产一区二区久久| 欧美激情 高清一区二区三区| av电影中文网址| 成人黄色视频免费在线看| avwww免费| 精品国产国语对白av| 欧美精品一区二区免费开放| 久久狼人影院| 99国产精品99久久久久| 久久久久九九精品影院| 天天躁狠狠躁夜夜躁狠狠躁| 黄色怎么调成土黄色| 满18在线观看网站| 亚洲专区中文字幕在线| 91大片在线观看| 最近最新中文字幕大全免费视频| 伊人久久大香线蕉亚洲五| 高清在线国产一区| 国产伦人伦偷精品视频| 18禁观看日本| 最近最新中文字幕大全电影3 | 99久久久亚洲精品蜜臀av| 国产精品 欧美亚洲| 国产有黄有色有爽视频| 午夜视频精品福利| 丰满人妻熟妇乱又伦精品不卡| 91av网站免费观看| 三上悠亚av全集在线观看| 欧美大码av| 国产成人精品久久二区二区91| 99久久人妻综合| 黄色怎么调成土黄色| 久久精品91无色码中文字幕| 免费看a级黄色片| 亚洲色图综合在线观看| 又大又爽又粗| 午夜福利欧美成人| 色综合婷婷激情| 波多野结衣一区麻豆|