• <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 ?

    Applicability of Biodegradable Mulch in Maize Production in Northeastern Yunnan

    2015-12-14 08:32:36YunshuangDINGJimeiHUANGChengminQIANBinzhaoLIUJinZHOULiushuangNI
    Agricultural Science & Technology 2015年10期
    關(guān)鍵詞:農(nóng)用地內(nèi)蒙古科技

    Yunshuang DING, Jimei HUANG, Chengmin QIAN, Binzhao LIU, Jin’e ZHOU, Liushuang NI

    China Agricultural Research System Qujing Corn Experiment Station/Qujing City Academy of Agricultural Sciences, Qujing 655000, China

    Northeastern Yunnan is situated in Wumeng Mountains of the Yunnan-Guizhou Plateau and lies within the humid subtropical zone.There is less rain in winter and spring,and rainy season is in hot summer and autumn. In general, rainy season starts from the end of May. In early maize growth stage,northeastern Yunnan is with less rain and insufficient accumulated temperature, and it becomes indispensible to make use of mulches for maize cultivation.However,common mulch is difficult to be degraded or recycled,and consequently,soil contamination by mulches would go worse, deteriorating eco-environment simultaneously. Therefore, the research collected 15 controllable biodegradable mulches nationwide and conducted an experiment concerning drying in the sun, soil burying,and maize cultivation with mulches in order to select controllable biodegradable mulches to replace common mulches.

    Methods and Materials

    Test design

    Drying in the sun The test was designed as per randomized block design, including 17 treatments, and two replications, covering the treatments with 15 biodegradable mulch, the treatment with common mulch (CK1)and the treatment without mulch(CK2).Specifically,the length of every test plot is 10 m,and ridging was conducted as per 90 cm of wide row and 40 cm of narrow row. Besides, thermometers were arranged in replication 1 in the middle of the test plot, covering ground thermometer, maximum and minimum thermometers. Specifically, maximum and minimum thermometers were set on mulches in the plot with mulches and on ground in the treatment without mulches.

    Test design with burying The test with burying used split plot design.Specifically,ground sample was factorA, and A1-A15 were biodegradable mulches and A16 was common mulch(CK1); ground depth was factor B,concerning three treatments of 5 cm(B1),15 cm(B2)and 25 cm(B3),with 4 replications. Furthermore, for every replication, a rectangle-shaped flat bottom pit (50×600 cm) was dug and 16 biodegradable mulches and common mulches (CK1) were cut into mulch pieces (45×20 cm), followed by tabbing. Subsequently, the samples were placed in the pits in order randomly, and then recorded to formulate a plane graph. Finally, all dug soils were refilled.

    Test design of maize cultivation with mulches The test was conducted as per randomized block design, including the treatments with mulches of A1-A15,the treatment with common mulch of A16 (CK1), and the treatment without mulches of A17(CK2), with three replications and 51 test plots. The cultivation crop was maize Yunduan No.999.The length of every test plot was 20 m, and ridges were constructed with a height of 1.3 m. Besides, the maize was cultivated in wide and narrow rows with line spacing of 90 and 40 cm, respectively. Additionally, plant distance was kept 40 cm, and the test left seedling doubly.

    Test materials

    The degradable mulches included Huali 1# (A1), Huali 2#(A2), Huali No.3#(A3),HY—1(A4),HY—2(A5),HY—3(A6), Jinfa 1#(A7), Jinfa 2#(A8), 1#(A9), 2# (A10), 3# (A11), BASF—1(A12), BASF—2 (A13), BASF—3(A14),Yide(A15),and common mulch Qingtian(A16).

    Test condition and management

    The preceding crop was vegetable in the test fields,and soil plough layer reached 30 cm. The soils are sandy red soils. Maize seeds were sown on April 23, 2014 as per direct seeding with wide and narrow rows.Furthermore, decomposed dung was applied at 15 000 kg/hm2and slow-release fertilizer at 600 kg/hm2as base fertilizers. On May 23, maize was irrigated, and seedlings were thinned out and fixed. It is notable that 176 plants were maintained in every test plot. A heavy rain occurred on July 3 and precipitation was abundant in later period. Besides, additional fertilizer, disease and pest control were conducted as per local methods. Maize was harvested on September 25,2014.

    Results and Analysis

    Analysis on degradation of mulches in test fields

    Analysis on degradation of mulches As shown in Fig.1,induction periods of the 15 degradable mulches were all fewer than the target of 70 d.Specifically, the induction period of treatment A12 reached the longest of 56 d; the periods of rest most treatments were in the range of 35-45 d;the periods of few treatments were below 20 d. As for rifting stage,degradable mulches all performedpoorly, which were far from meeting target of 85 d. For example, rifting stages of treatments A5, A6, A12 and A13 reached over 50 d, but the stage of treatment A15 just last for 20 d.Furthermore, the heavier-rifting stages of all the treatments were fewer than the target days. For example, the stages of treatments A5, A6 and A12 last longer for about 70 d. The broken periods of treatment A12 last the longest(after 175 d) and of treatment A10 reached the shortest (after 45 d). Finally, non-mulch periods just occurred in the treatments of A3, A10, A14 and A15 on the 160th or 170thd.

    Effects of mulches on soil temperatures

    Mulching for 4-12 d The test showed that all test mulches did not reach induction period on the 12thd of mulching, showing little differences with CK1. Compared with CK2, temperatures of soils kept increasing in the depths of 5 and 10 cm(Fig.2).

    Mulching for 16-44 d Since the 16thd of mulching,degradable mulches entered induction periods in succession.It observed that soil temperature differed insignificantly among treatments at 8:00, but significantly at 17:00,which incorporated that temperature growth caused by accumulated tem-perature is considerable by mulching(Fig.3).

    Mulching for 48-60 d After 48 d mulching, all degradable mulches entered induction periods and most treatments entered heavier-rifting stage except of treatments A5,A6 and A12(Fig.4).

    Table 1 Degradation rates of different treatments %

    Table 2 Growth stages of maize in different treatments d

    Analysis on test results

    As shown in Table 1, degradation rates of degradable mulches tended to be volatile upon mulch species and the effects of burying depth on degradable rates were also under the influence.

    Analysis on mulching tests of maize

    Analysis on degradation of mulches The induction periods of the 15 degradable mulches were all fewer than the target of 70 d. Specifically, the induction period of treatment A12 reached the longest of 56 d and of treatments A2, A10, A14 anmd A15 maintained the shortest of 16 d, suggesting that degradation process can not be effectively controlled.As for rifting stage,degradable mulches all performed poorly, which were far from meeting target of 85 d. For example,rifting stages of treatments A12 lastthe longest of 59 d and of treatment A10 the shortest of 20 d.Furthermore,the heavier-rifting stages of all the treatments were fewer than the target days of 105 d.For example,the stages of treatment A12 last the longest for about 90 d and of treatments A10 and A11 the shortest of 35 d. The broken periods of treatment A12 last the longest (175 d) and of treatment A10 reached the shortest (45 d). Finally,non-mulch periods just occurred in the treatments of A3, A10, A14 and A15 on the 160th or 170thd.

    Effects of mulches on soil temperatures

    Analysis on soils with the depth of 5 cm It was observed at 8:00 and 17:00 that soil temperature increased in all treatments compared with CK2.On the 4thd of mulching,soil temperature grew higher in treatments A13 and A14 than that of CK1, and soil temperatures in treatments A5, A6,A9, A10, A13 and A14 kept higher than that of CK1 on the 8thd of mulching. On the 12thd, however, soil temperatures of treatments A2, A3,A4,A6,A9 and A13 maintained higher than that of CK1.

    Analysis on soils with the depth of 10 cm It was observed at 8:00 and 17:00 that soil temperatures in all treatments kept lower than that of CK1, indicating that temperature growth effects are poorer, but kept higher than that of CK2. After 4 d mulching, however, soil temperatures in treatments A13, A14 and A15 were lower than that of CK1. After 8 d mulching, in contrast, temperature growth in treatment A6 performed stronger and soil temperatures of the treatments were close to that of CK1 12 d after mulching.

    Effects of degradable mulches on maize growth stage The growth stage of mulched maize last for 137-148 d, which was 7-15 d shorter than that of CK2. Besides, some of the mulched maize kept longer than CK1 in terms of growth stage, but some shorter.

    Effects of mulching on disease and pest damages Generally speaking,dominated by Puccinia sorghi Schw,disease damages proved lighter and the treatments had insignificant effects on the diseases.

    Effects of mulching on maize yield It can be concluded from analysis of variance that insignificant differences were shown of maize yield of 13 treatments with CK1,and significant differences were shown of the other two treatments with CK1. In contrast, 14 treatments showed little differences with CK2 in terms of maize yield, and the other treatment showed significant differences with CK2. Besides, significant differences were shown between CK1 and CK2.

    Discussions

    The controllability analysis on induction period

    From mulch degradation in the test, it can be concluded that the in-duction period last the longest of 56 d which was still below than the target of 70 d.Therefore, it is hard for induction period to meet maize demands in terms of humidity and temperature,and the test showed that only treatments A12,A13,A6 and A7 performed better in controllability of induction periods.

    The controllability analysis on rifting period In different test plots, induction periods of all degradable mulches all kept below 60 d, directly affecting the target of 85 d rifting period.Besides, only treatment A12 performed well, entering rifting period after 59 d.

    The controllability analysis on heavier-rifting stage Under influence of poor controllability of induction period and rifting period,heavier-rifting stages of the degradable mulches among the treatments all maintained lower than expected 105 d.besides,of the test treatments, treatment A12 performed better,which achieved 90 d in terms of the heavier-rifting stage after 15 d in the mulching treatment and after 70 d in the treatment dried under the sun.

    Table 3 Comparisons of maize yields by mulching

    The exposed parts in ridges and degradation effects of mulches buried under soils

    The degradation effects of exposed mulches in ridges In terms of the treatment dried under the sun, treatments A3, A10 and A14 performed better in exposed parts, so that mulches were totally degraded on the 160th, 170thand 170thd, respectively.After 190 d mulching, mulches in rest treatments all broke and the degradation effect reached over 95%. In the mulching treatment, however, treatments A2, A3, A7, A8, A11 and A10 performed better in degradation effects for the exposed parts, and the mulches were totally decomposed on the 130th, 170th, 170th, 170th, 170thand 190thd,respectively.

    Degradation effects in the burying treatment In the treatment, the degradation effects of A2, A3, A6, A9,A11 and A14 were better and of the rest treatments poorer.

    Mulching effect of degradable mulches

    Temperature-increasing effect In early mulching stage, temperatures of soils in different treatments all kept increasing, and the effect on soils with depth of 5 cm were better than that of soils with depth of 10 cm.

    Advancing maize growth For the mulched maize, key growth stage was 6-15 d earlier than that of exposed maize. Compared with CK1, key growth stages of treatments A1 and A2 were 2-17 d later,but maize in rest treatments showed similar or 1-8 d later before tasseling stage,and 1-8 d earlier after tasseling stage.

    Yield increasing effect Yields of mulched maize proved all higher than yield of exposed maize, which demonstrated that degradable mulch plays the role of improve maize yield.Meanwhile, maize yields in the treatments with degradable mulches or common mulches were similar.

    Results and Analysis

    Poor controllability of induction period of degradable mulches

    The induction periods of the 15 degradable mulches were all fewer than the target of 70 d.Specifically,the induction period of treatment A12 reached the longest of 56 d; the periods of rest most treatments were in the range of 35-45 d; the periods of few treatments were below 20 d. These demonstrated that the degradation process can not be well controlled and controllability of induction period is poor.

    Similar mulching effect with that of common mulch

    In the mulching treatment, most degradable mulches could meet demands of agricultural operation.In accordance with the test results, totally degradable mulches prove similar with common mulches in terms of heat preservation and yield increasing for crops, and perform excellently in covering strength, extension degree and toughness.

    The role of degradable mulches in removing mulch residues

    It can be concluded from drying and mulching tests that the fewer mulch residues were left or totally degraded after maize harvesting. From burying test, however, most mulches can be degraded, except of the treatment A10 where mulches in the depths of 5, 15 and 25 cm were less degraded. In general, degradable mulches would remove mulch residues in a certain period.

    Expectation

    The test proved that similar to common mulch, biodegradable mulch functions well in heat preservation and yield increasing, as well as resolving the issue of plastic pollution, which is of great significance in environment protection,agricultural sustainable development, and eco-agriculture, green agriculture and modernized agriculture.

    Suggestion

    It is necessary to further regulate controllability, anti-tensile strength and heat preservation of degradable mulches and adjust recipe proportions of raw materials to improve property and quality of degradable mulches according to growth term of crops and induction periods.

    [1]MA WL (馬文蓮),MA QY (馬全義),MA XM (馬學(xué)銘), et al. Comparison research on biodegradable mulch and common mulch(生物降解膜與普通地膜的比較示范研究)[J].Inner Mongolia Agricultural Science and Technology (內(nèi)蒙古農(nóng)業(yè)科技),2012,(4):42-43.

    [2]CHU WH(褚衛(wèi)紅),SHI YH(石亞輝).The function and effect of agricultural mulches and countermeasures (農(nóng)用地膜在農(nóng)業(yè)生產(chǎn)中的作用、影響及對策)[J].Inner Mongolia Agricultural Science and Technology(內(nèi)蒙古農(nóng)業(yè)科技),2007,(7):142-143.

    猜你喜歡
    農(nóng)用地內(nèi)蒙古科技
    在內(nèi)蒙古,奶有一百種吃法
    這是美麗的內(nèi)蒙古
    草原歌聲(2019年2期)2020-01-06 03:11:12
    可愛的內(nèi)蒙古
    草原歌聲(2018年2期)2018-12-03 08:14:06
    科技助我來看云
    科技在線
    愛在內(nèi)蒙古
    草原歌聲(2017年3期)2017-04-23 05:13:44
    科技在線
    科技在線
    住建部:城市大數(shù)據(jù)已覆蓋400個城市
    精品(2015年10期)2015-11-01 02:14:08
    龍海市縣域農(nóng)用地整理規(guī)劃
    宅男免费午夜| 巨乳人妻的诱惑在线观看| 国产精品久久久久成人av| 日本av免费视频播放| 啦啦啦中文免费视频观看日本| 国产精品免费大片| svipshipincom国产片| 男女边吃奶边做爰视频| 少妇猛男粗大的猛烈进出视频| 亚洲欧美清纯卡通| 国产精品亚洲av一区麻豆 | av国产久精品久网站免费入址| 国产一区二区三区av在线| 在线看a的网站| 久久国产精品大桥未久av| 岛国毛片在线播放| 欧美日本中文国产一区发布| 亚洲精华国产精华液的使用体验| 男女床上黄色一级片免费看| 99国产精品免费福利视频| 国产成人精品福利久久| 国产有黄有色有爽视频| a级毛片在线看网站| 日本色播在线视频| 国产男人的电影天堂91| 2021少妇久久久久久久久久久| 国产野战对白在线观看| 欧美xxⅹ黑人| 一级片'在线观看视频| 亚洲精品国产av成人精品| 亚洲美女搞黄在线观看| 欧美激情高清一区二区三区 | 国产色婷婷99| 欧美精品一区二区大全| 亚洲国产精品一区三区| 999精品在线视频| 99re6热这里在线精品视频| 汤姆久久久久久久影院中文字幕| 国产精品女同一区二区软件| 婷婷色av中文字幕| 日韩熟女老妇一区二区性免费视频| 波多野结衣一区麻豆| 综合色丁香网| 亚洲专区中文字幕在线 | 2021少妇久久久久久久久久久| 在线观看人妻少妇| 天天操日日干夜夜撸| 可以免费在线观看a视频的电影网站 | 丝袜喷水一区| 国产免费福利视频在线观看| 中文字幕色久视频| a 毛片基地| 美女中出高潮动态图| 黄频高清免费视频| 国产男人的电影天堂91| 欧美成人午夜精品| 国产一区二区三区综合在线观看| 亚洲av成人精品一二三区| 日日爽夜夜爽网站| av在线app专区| 大陆偷拍与自拍| 日韩制服骚丝袜av| 日韩免费高清中文字幕av| 新久久久久国产一级毛片| 国产av精品麻豆| 色婷婷av一区二区三区视频| 国产精品嫩草影院av在线观看| 亚洲国产毛片av蜜桃av| 母亲3免费完整高清在线观看| 欧美国产精品一级二级三级| 韩国高清视频一区二区三区| 不卡视频在线观看欧美| 精品一区二区三区四区五区乱码 | 在现免费观看毛片| 熟女av电影| 久久精品亚洲av国产电影网| 国精品久久久久久国模美| 如何舔出高潮| 欧美日韩综合久久久久久| 最近最新中文字幕免费大全7| 美国免费a级毛片| 欧美av亚洲av综合av国产av | 丰满饥渴人妻一区二区三| 久久av网站| 日本色播在线视频| 中文字幕av电影在线播放| 韩国精品一区二区三区| 精品国产一区二区三区久久久樱花| 99久久精品国产亚洲精品| 国语对白做爰xxxⅹ性视频网站| 国产野战对白在线观看| a级毛片在线看网站| 在线观看国产h片| 亚洲熟女毛片儿| 中文字幕人妻丝袜一区二区 | 在线观看一区二区三区激情| 亚洲精品自拍成人| 日韩成人av中文字幕在线观看| 亚洲精品国产区一区二| 老司机影院毛片| 桃花免费在线播放| 久久久久精品性色| 人人妻人人爽人人添夜夜欢视频| 日本vs欧美在线观看视频| 国产精品久久久久成人av| 日韩精品免费视频一区二区三区| 日本色播在线视频| 欧美 亚洲 国产 日韩一| 巨乳人妻的诱惑在线观看| 老鸭窝网址在线观看| 丰满乱子伦码专区| 999久久久国产精品视频| 亚洲成色77777| 女人精品久久久久毛片| 亚洲五月色婷婷综合| 亚洲,欧美精品.| 男人操女人黄网站| 高清欧美精品videossex| 国产精品久久久av美女十八| 尾随美女入室| 男女下面插进去视频免费观看| 精品午夜福利在线看| 亚洲国产av影院在线观看| 黑人猛操日本美女一级片| 亚洲欧美激情在线| 大香蕉久久网| 2018国产大陆天天弄谢| 免费看av在线观看网站| 中文字幕另类日韩欧美亚洲嫩草| 精品第一国产精品| 亚洲av在线观看美女高潮| 亚洲成av片中文字幕在线观看| 国产男女超爽视频在线观看| 久久精品人人爽人人爽视色| 久久国产精品大桥未久av| 国产成人精品无人区| 十八禁人妻一区二区| 中文字幕人妻丝袜一区二区 | 亚洲av成人精品一二三区| 免费人妻精品一区二区三区视频| 精品国产乱码久久久久久男人| 久久av网站| 国产欧美亚洲国产| 老汉色av国产亚洲站长工具| 五月开心婷婷网| 亚洲av中文av极速乱| 各种免费的搞黄视频| 中文字幕av电影在线播放| 国产精品一二三区在线看| 精品国产一区二区三区四区第35| videosex国产| 国产精品一国产av| 亚洲国产中文字幕在线视频| 日本欧美国产在线视频| 久久久久久人妻| 99re6热这里在线精品视频| 最新的欧美精品一区二区| 日韩成人av中文字幕在线观看| 亚洲av在线观看美女高潮| 永久免费av网站大全| 制服人妻中文乱码| 国产精品麻豆人妻色哟哟久久| 欧美精品人与动牲交sv欧美| 国产1区2区3区精品| 在线观看人妻少妇| 国产精品一国产av| 一边摸一边抽搐一进一出视频| 亚洲精品一二三| 亚洲欧洲国产日韩| 国产乱来视频区| 男女床上黄色一级片免费看| 视频在线观看一区二区三区| 国产黄频视频在线观看| 人体艺术视频欧美日本| www.av在线官网国产| 国产淫语在线视频| 在线亚洲精品国产二区图片欧美| 一级a爱视频在线免费观看| 色婷婷久久久亚洲欧美| 美女视频免费永久观看网站| 成人漫画全彩无遮挡| 精品少妇内射三级| 久久久久久人妻| 五月开心婷婷网| 久久精品亚洲av国产电影网| 国产亚洲最大av| 亚洲一区中文字幕在线| 欧美av亚洲av综合av国产av | 丝袜美足系列| 久久久久久人人人人人| 1024香蕉在线观看| 久久天躁狠狠躁夜夜2o2o | 黄色怎么调成土黄色| av线在线观看网站| 国产精品国产三级专区第一集| 色播在线永久视频| 久久av网站| 桃花免费在线播放| 如何舔出高潮| 丝袜人妻中文字幕| 欧美国产精品va在线观看不卡| 欧美黑人精品巨大| 极品人妻少妇av视频| 欧美日韩精品网址| 大陆偷拍与自拍| 伦理电影免费视频| 天天影视国产精品| 日本vs欧美在线观看视频| 一边摸一边做爽爽视频免费| 中文字幕人妻丝袜制服| 人人妻人人添人人爽欧美一区卜| 人妻 亚洲 视频| 哪个播放器可以免费观看大片| 丰满迷人的少妇在线观看| 欧美成人精品欧美一级黄| 美女高潮到喷水免费观看| 青草久久国产| 在线 av 中文字幕| 国产免费现黄频在线看| 亚洲欧洲精品一区二区精品久久久 | 一区二区三区乱码不卡18| 国产免费一区二区三区四区乱码| 国产精品久久久久久精品电影小说| 一区二区三区乱码不卡18| 夜夜骑夜夜射夜夜干| 久久 成人 亚洲| 观看美女的网站| 一二三四中文在线观看免费高清| 日韩欧美精品免费久久| 亚洲国产欧美日韩在线播放| 母亲3免费完整高清在线观看| 91精品伊人久久大香线蕉| 久久毛片免费看一区二区三区| 国产一区二区在线观看av| 亚洲三区欧美一区| 天天操日日干夜夜撸| 热re99久久国产66热| 少妇被粗大的猛进出69影院| 国产精品亚洲av一区麻豆 | 最新在线观看一区二区三区 | 91成人精品电影| 制服诱惑二区| 国产乱来视频区| 亚洲第一区二区三区不卡| 欧美日韩视频高清一区二区三区二| 国产免费又黄又爽又色| 色吧在线观看| 纯流量卡能插随身wifi吗| 久久久久久久久久久久大奶| 亚洲国产欧美在线一区| 青春草国产在线视频| 中文字幕人妻丝袜制服| 9191精品国产免费久久| 国产一区二区三区综合在线观看| 丰满迷人的少妇在线观看| 日本欧美视频一区| 99久久精品国产亚洲精品| 亚洲精品国产区一区二| 国产极品天堂在线| 狂野欧美激情性bbbbbb| 黄频高清免费视频| 亚洲综合精品二区| 成人亚洲欧美一区二区av| 日韩成人av中文字幕在线观看| 在线观看免费视频网站a站| 免费不卡黄色视频| 亚洲专区中文字幕在线 | 丝瓜视频免费看黄片| 免费人妻精品一区二区三区视频| 久热爱精品视频在线9| 99精国产麻豆久久婷婷| 国产成人免费无遮挡视频| 日韩一区二区视频免费看| 国产极品天堂在线| 欧美另类一区| a级毛片黄视频| 狂野欧美激情性bbbbbb| 另类亚洲欧美激情| 午夜91福利影院| 欧美日韩视频高清一区二区三区二| 国产成人a∨麻豆精品| 在现免费观看毛片| 另类亚洲欧美激情| 国产福利在线免费观看视频| 亚洲国产av新网站| 亚洲欧美清纯卡通| 日韩欧美一区视频在线观看| 精品少妇一区二区三区视频日本电影 | 亚洲第一av免费看| 亚洲精品日韩在线中文字幕| 天美传媒精品一区二区| 涩涩av久久男人的天堂| 精品久久久久久电影网| 黄色 视频免费看| 婷婷色麻豆天堂久久| 亚洲自偷自拍图片 自拍| 90打野战视频偷拍视频| 91精品伊人久久大香线蕉| 国产精品二区激情视频| 人人澡人人妻人| 少妇被粗大的猛进出69影院| 欧美少妇被猛烈插入视频| 日本欧美视频一区| 久久久久国产一级毛片高清牌| 亚洲国产精品国产精品| 少妇人妻久久综合中文| 女人高潮潮喷娇喘18禁视频| 99久久精品国产亚洲精品| 纯流量卡能插随身wifi吗| 欧美精品一区二区免费开放| 亚洲熟女毛片儿| 日韩av不卡免费在线播放| 国产片特级美女逼逼视频| 中文字幕另类日韩欧美亚洲嫩草| 一本久久精品| 在线天堂最新版资源| 中文字幕高清在线视频| 五月开心婷婷网| 最近中文字幕高清免费大全6| 亚洲第一青青草原| 国产高清国产精品国产三级| 亚洲成人国产一区在线观看 | 麻豆乱淫一区二区| 午夜日本视频在线| 国产日韩欧美视频二区| 国产精品偷伦视频观看了| 97人妻天天添夜夜摸| 天堂中文最新版在线下载| av卡一久久| 美女高潮到喷水免费观看| 日本爱情动作片www.在线观看| 黄片小视频在线播放| 伦理电影免费视频| 欧美老熟妇乱子伦牲交| 中文字幕色久视频| 精品国产超薄肉色丝袜足j| 日韩,欧美,国产一区二区三区| 午夜av观看不卡| 色婷婷av一区二区三区视频| 天堂8中文在线网| 女性被躁到高潮视频| 高清在线视频一区二区三区| 另类亚洲欧美激情| 制服丝袜香蕉在线| 在线观看免费午夜福利视频| 成人18禁高潮啪啪吃奶动态图| 亚洲情色 制服丝袜| 国产精品一二三区在线看| 岛国毛片在线播放| 大片电影免费在线观看免费| 麻豆精品久久久久久蜜桃| 99国产综合亚洲精品| 国产精品三级大全| 九九爱精品视频在线观看| 欧美精品人与动牲交sv欧美| 国产成人免费无遮挡视频| 国产淫语在线视频| 99热国产这里只有精品6| a级毛片黄视频| 国产成人精品福利久久| 高清av免费在线| 中文字幕制服av| 亚洲一码二码三码区别大吗| 久久青草综合色| 精品一品国产午夜福利视频| 亚洲色图 男人天堂 中文字幕| 欧美日韩av久久| 国产女主播在线喷水免费视频网站| 国产精品嫩草影院av在线观看| 亚洲欧美一区二区三区黑人| 美女福利国产在线| 亚洲伊人色综图| 国产野战对白在线观看| 日本欧美视频一区| 日本vs欧美在线观看视频| 欧美成人精品欧美一级黄| 麻豆av在线久日| av不卡在线播放| 国产有黄有色有爽视频| 久久韩国三级中文字幕| 亚洲欧美成人精品一区二区| 成人国产av品久久久| 亚洲欧美中文字幕日韩二区| 国产伦人伦偷精品视频| 国产成人a∨麻豆精品| 十八禁网站网址无遮挡| 激情五月婷婷亚洲| avwww免费| 中国三级夫妇交换| 黄色 视频免费看| 永久免费av网站大全| 天天躁日日躁夜夜躁夜夜| 久久久久精品人妻al黑| 中文精品一卡2卡3卡4更新| av线在线观看网站| 欧美日韩福利视频一区二区| 一级a爱视频在线免费观看| 中文字幕人妻丝袜制服| 亚洲国产欧美网| 日韩视频在线欧美| 精品一区二区三区四区五区乱码 | 黄色怎么调成土黄色| 午夜免费男女啪啪视频观看| 亚洲综合色网址| 男人舔女人的私密视频| 免费高清在线观看视频在线观看| 不卡av一区二区三区| videosex国产| 久久人人爽av亚洲精品天堂| 人妻 亚洲 视频| 极品人妻少妇av视频| 国产无遮挡羞羞视频在线观看| 男女边摸边吃奶| 一边摸一边抽搐一进一出视频| 成年美女黄网站色视频大全免费| 亚洲,一卡二卡三卡| 欧美老熟妇乱子伦牲交| 国产成人欧美在线观看 | 亚洲国产中文字幕在线视频| 精品人妻一区二区三区麻豆| 一区在线观看完整版| 久热爱精品视频在线9| 黄频高清免费视频| 午夜福利视频精品| 国产成人午夜福利电影在线观看| 18禁裸乳无遮挡动漫免费视频| 中文字幕制服av| 亚洲精品久久久久久婷婷小说| 欧美国产精品va在线观看不卡| 色网站视频免费| 高清不卡的av网站| 久久天堂一区二区三区四区| av网站在线播放免费| 欧美精品高潮呻吟av久久| 国产激情久久老熟女| 宅男免费午夜| 男男h啪啪无遮挡| 国产伦人伦偷精品视频| 最近的中文字幕免费完整| 香蕉国产在线看| 女人被躁到高潮嗷嗷叫费观| 极品人妻少妇av视频| 久久国产精品男人的天堂亚洲| 激情五月婷婷亚洲| 欧美激情极品国产一区二区三区| 中文字幕精品免费在线观看视频| 伊人亚洲综合成人网| 性色av一级| 人人妻人人澡人人看| 久久精品国产a三级三级三级| 爱豆传媒免费全集在线观看| 80岁老熟妇乱子伦牲交| 丰满饥渴人妻一区二区三| 欧美日韩视频精品一区| 国产日韩欧美亚洲二区| 高清av免费在线| 亚洲成人国产一区在线观看 | 嫩草影视91久久| 精品久久蜜臀av无| 欧美老熟妇乱子伦牲交| 国产成人a∨麻豆精品| 欧美xxⅹ黑人| 国产亚洲一区二区精品| 亚洲伊人久久精品综合| 久久久精品免费免费高清| 综合色丁香网| 在线天堂最新版资源| 国产精品免费视频内射| 最黄视频免费看| 亚洲少妇的诱惑av| 欧美少妇被猛烈插入视频| 捣出白浆h1v1| av不卡在线播放| 日韩大码丰满熟妇| 18禁观看日本| 大码成人一级视频| 高清视频免费观看一区二区| 热re99久久国产66热| 看十八女毛片水多多多| 高清不卡的av网站| av有码第一页| 男男h啪啪无遮挡| 中文字幕人妻丝袜制服| 一边摸一边做爽爽视频免费| 久久久精品国产亚洲av高清涩受| 国产成人系列免费观看| 久久综合国产亚洲精品| 夫妻性生交免费视频一级片| 亚洲欧美一区二区三区国产| 99热国产这里只有精品6| 亚洲第一av免费看| 人人妻人人添人人爽欧美一区卜| 你懂的网址亚洲精品在线观看| 免费黄色在线免费观看| 国产麻豆69| 男人添女人高潮全过程视频| 校园人妻丝袜中文字幕| 制服丝袜香蕉在线| 热re99久久精品国产66热6| 久久久精品国产亚洲av高清涩受| 欧美黑人精品巨大| 黄色毛片三级朝国网站| 在线看a的网站| 超碰97精品在线观看| 色吧在线观看| 午夜福利,免费看| 女人爽到高潮嗷嗷叫在线视频| 伊人亚洲综合成人网| 中文字幕亚洲精品专区| 在线观看三级黄色| 亚洲成av片中文字幕在线观看| 国语对白做爰xxxⅹ性视频网站| 亚洲av中文av极速乱| 亚洲美女搞黄在线观看| svipshipincom国产片| 精品酒店卫生间| 曰老女人黄片| 久久久久精品久久久久真实原创| 午夜福利乱码中文字幕| 在线观看免费高清a一片| 亚洲av日韩在线播放| 美女视频免费永久观看网站| 自拍欧美九色日韩亚洲蝌蚪91| 99国产精品免费福利视频| 亚洲自偷自拍图片 自拍| 青草久久国产| 在线观看一区二区三区激情| 天美传媒精品一区二区| 久久99一区二区三区| 妹子高潮喷水视频| 成年女人毛片免费观看观看9 | 欧美日韩一区二区视频在线观看视频在线| 建设人人有责人人尽责人人享有的| 99久久精品国产亚洲精品| kizo精华| 婷婷色综合www| 黄片无遮挡物在线观看| 午夜影院在线不卡| av国产精品久久久久影院| 男女免费视频国产| 蜜桃国产av成人99| 777米奇影视久久| 欧美日本中文国产一区发布| 曰老女人黄片| 一区二区av电影网| 亚洲视频免费观看视频| 一本久久精品| 国产 一区精品| 欧美精品高潮呻吟av久久| 黄色怎么调成土黄色| 国产成人精品久久二区二区91 | 只有这里有精品99| tube8黄色片| 久久久久久久精品精品| 亚洲欧美一区二区三区黑人| 18禁动态无遮挡网站| 欧美中文综合在线视频| 欧美最新免费一区二区三区| 亚洲欧美精品综合一区二区三区| 精品一区二区免费观看| 国产成人一区二区在线| 国产精品嫩草影院av在线观看| 中文字幕人妻熟女乱码| 久久婷婷青草| 久久韩国三级中文字幕| 国产黄色免费在线视频| 精品亚洲成国产av| 久久人人爽av亚洲精品天堂| 国产福利在线免费观看视频| 自线自在国产av| av天堂久久9| 久久人妻熟女aⅴ| 久久久久久人人人人人| 男女高潮啪啪啪动态图| 国产熟女欧美一区二区| 亚洲国产欧美日韩在线播放| 国产成人啪精品午夜网站| 久久国产精品大桥未久av| 热re99久久精品国产66热6| 成人三级做爰电影| 色94色欧美一区二区| 韩国av在线不卡| 十分钟在线观看高清视频www| 亚洲精品美女久久久久99蜜臀 | 久久久欧美国产精品| 婷婷色综合www| 中文字幕人妻熟女乱码| 热99久久久久精品小说推荐| 欧美人与性动交α欧美软件| 欧美日韩福利视频一区二区| 国产成人午夜福利电影在线观看| 国产精品久久久久成人av| 在线观看免费午夜福利视频| 久久毛片免费看一区二区三区| 国产在视频线精品| 欧美日韩福利视频一区二区| 1024香蕉在线观看| 热99国产精品久久久久久7| 日本午夜av视频| 午夜免费男女啪啪视频观看| 国产精品久久久久成人av| 国产极品粉嫩免费观看在线| 熟女av电影| 一边摸一边抽搐一进一出视频| 精品一区二区免费观看| 亚洲精品美女久久久久99蜜臀 | 国产一卡二卡三卡精品 | 精品国产露脸久久av麻豆| 亚洲国产欧美日韩在线播放| 欧美少妇被猛烈插入视频| 久久久欧美国产精品| 欧美人与性动交α欧美软件| 99热国产这里只有精品6| 尾随美女入室| 国产 精品1|