摘""要:植保無人飛機(jī)作業(yè)參數(shù)對(duì)無人飛機(jī)噴灑過程中的霧滴分布有顯著影響,從而影響農(nóng)藥的利用率和病蟲害的防治效果。為探究多旋翼植保無人飛機(jī)作業(yè)參數(shù)對(duì)杧果樹冠層噴霧質(zhì)量與效果的影響,以提高植保無人飛機(jī)施藥的對(duì)靶高效沉積,本研究應(yīng)用大疆T40型植保無人飛機(jī)采用正交試驗(yàn)對(duì)杧果樹進(jìn)行噴霧作業(yè),對(duì)主要作業(yè)參數(shù)霧滴粒徑(80、100、120"μm)、作業(yè)高度(2.0、2.5、3.0"m)、作業(yè)速度(3.0、4.0、5.0"m/s)進(jìn)行優(yōu)選。結(jié)果表明:施藥參數(shù)為霧滴粒徑80"μm、作業(yè)高度2.0"m、作業(yè)速度3.0"m/s時(shí),植保無人飛機(jī)霧滴在杧果樹各個(gè)冠層的霧滴沉積密度、覆蓋率、霧滴均勻性等均顯著大于其他處理組。霧滴沉積密度、覆蓋率、作業(yè)高度與作業(yè)速度呈負(fù)相關(guān)。極差分析結(jié)果顯示,霧滴粒徑是影響杧果樹冠層霧滴沉積密度的主要因素;作業(yè)高度是影響杧果樹下層葉片正面與內(nèi)層葉片背面霧滴覆蓋率的主要因素;作業(yè)速度是影響杧果樹上層葉片背面霧滴覆蓋率的主要因素;其余各層葉片正面與背面的噴霧粒徑是影響霧滴覆蓋率的主要因素。植保無人飛機(jī)在杧果樹冠層的霧滴分布差異性較大,影響霧滴均勻性的主要因素是霧滴粒徑,其次是作業(yè)速度、作業(yè)高度。根據(jù)T40多旋翼植保無人飛機(jī)在杧果樹冠層的霧滴沉積密度、霧滴覆蓋率、霧滴均勻性結(jié)果綜合得到植保無人飛機(jī)在杧果樹上作業(yè)的最佳參數(shù)組合為霧滴粒徑80"μm,作業(yè)高度2.0"m,作業(yè)速度3.0"m/s,為小型植保無人飛機(jī)在杧果及其他類似果園空中噴灑作業(yè)提供指導(dǎo)。
關(guān)鍵詞:植保無人飛機(jī);杧果;作業(yè)參數(shù);霧滴;沉積分布中圖分類號(hào):S436.67;S494""""""文獻(xiàn)標(biāo)志碼:A
Effects"of"Spraying"Parameters"for"Plant"Protection"Unmanned"Aerial"Vehicle"on"Deposition"Distribution"of"Droplets"in"Mango"Canopy
WANG"Bingjie1,2,"PAN"Bo1,2,"DU"Changyuan3,"JIANG"Lei1,2*,"LIN"Yong1,2*,"ZHANG"Shaoshuai4
1."Environment"and"Plant"Protection"Institute,"Chinese"Academy"of"Tropical"Agricultural"Sciences,"Haikou,"Hainan"571101,"China;"2."Key"Laboratory"of"Integrated"Pest"Management"of"Tropical"Crops,"Ministry"of"Agriculture"and"Rural"Affairs,"Haikou,"Hainan"571101,"China;"3."College"of"Plant"Science"and"Technology,"Huazhong"Agricultural"University,"Wuhan,"Hubei"430070,"China;"4."Chinese"Academy"of"Tropical"Agricultural"Sciences,"Haikou,"Hainan"571101,"China
Abstract:"Plant"protection"unmanned"aerial"vehicle"(UAVs)"operational"parameters"have"remarkable"effects"on"droplet"distribution"in"UAVs"spraying,"which"significantly"affects"pesticide"utilization"rate"and"treatment"effectiveness."The"study"was"aimed"to"explore"the"effects"of"operating"parameters"of"electric"UAVs"on"droplet"deposition"distribution"in"mango"trees"canopy"and"to"enhance"the"efficiency"of"targeted"deposition"by"UAVs."The"DJI"T40"multi-rotor"electric"plant"protection"UAV"was"used"and"the"main"operational"parameters"including"droplet"sizes"(80,"100,"120"μm),"flight"height"(2.0,"2.5,"3.0"m)"and"flight"speed"(3.0,"4.0,"5.0"m/s)"were"optimized"by"an"orthogonal"test."When"the"droplet"size"was"80"μm"with"2.0"m"of"flight"height"and"3.0"m/s"of"flight"speed,"the"droplet"deposition"density,"coverage"rate"and"uniformity"in"each"canopy"of"mango"trees"were"significantly"larger"than"those"of"the"other"groups."There"was"a"negative"correlation"between"droplet"deposition"density,"coverage"rate"and"flight"height,"flight"speed."The"resultsnbsp;of"range"analysis"showed"that"droplet"size"was"the"main"factor"affecting"the"deposition"density"of"droplet"in"mango"canopy."The"flight"height"was"the"main"factor"affecting"the"coverage"rate"of"spray"droplets"on"the"front"side"of"the"lower"canopy"leaves"and"the"back"side"of"the"inner"canopy"leaves"of"mango"trees."The"flight"speed"was"the"main"factor"affecting"the"coverage"rate"of"spray"droplets"on"the"back"side"of"the"upper"canopy"leaves"of"mango"trees."The"spray"diameter"of"the"front"and"back"of"the"leaves"of"the"other"layers"was"the"main"factor"affecting"the"droplet"coverage"rate."The"droplet"distribution"within"mango"canopy"exhibited"significant"variation,"with"droplet"size"being"the"primary"factor"determining"uniformity,"followed"by"flight"speed"and"flight"height."In"our"current"study,"according"to"the"droplet"deposition"density,"coverage"rate"and"uniformity"in"mango"canopy,"the"best"operating"parameters"of"T40"multi-rotor"electric"plant"protection"UAV"were"obtained"as"follows:"droplet"size"of"80"μm,"operation"height"of"2.0"m,"and"operation"speed"of"3.0"m/s."It"could"provide"fundamental"guidance"of"the"operation"of"small"UAVs"for"the"aerial"spraying"of"mango"trees"and"other"similar"orchards.
Keywords:"plant"protection"UAV;"mango;"operational"parameters;"droplet;"deposition"distribution
DOI:"10.3969/j.issn.1000-2561.2024.11.018
杧果被稱為“熱帶水果之王”,是世界上最重要的五大水果之一[1]。我國(guó)杧果種植面積位居世界第二,主產(chǎn)區(qū)在海南、廣西、廣東、云南和四川等地[2]。農(nóng)業(yè)農(nóng)村部農(nóng)墾局?jǐn)?shù)據(jù)顯示,2021年我國(guó)杧果種植面積為37.46萬hm2,產(chǎn)量395.8萬t,其中海南的杧果種植面積為6.62萬hm2,產(chǎn)量55.5萬t。然而,熱區(qū)高溫高濕的氣候環(huán)境導(dǎo)致病蟲草害的滋生蔓延,農(nóng)藥年均使用量也相應(yīng)地高于溫帶地區(qū),施藥次數(shù)與施藥作業(yè)強(qiáng)度較大。海南杧果種植區(qū)多為丘陵山地,傳統(tǒng)地面施藥方式,包括背負(fù)式手動(dòng)噴霧器和地面機(jī)械噴霧器,效率低,勞動(dòng)強(qiáng)度大,面臨嚴(yán)峻挑戰(zhàn)[3-4]。并且傳統(tǒng)施藥器械屬于大霧滴、大容量噴灑,農(nóng)藥浪費(fèi)嚴(yán)重,有效利用率僅為35%左右[5-7]。目前熱區(qū)果樹種植人工成本的30%(甚至更高)為施藥作業(yè)所消耗,杧果園勞動(dòng)力短缺與管理技術(shù)落后等問題日益突出,植保無人飛機(jī)是一種高效的現(xiàn)代化施藥器械,合理使用可以及時(shí)、快速、有效地對(duì)農(nóng)作物病蟲害進(jìn)行防控,同時(shí)也能緩解果園勞動(dòng)力短缺問題,從而提高農(nóng)藥利用率,實(shí)現(xiàn)節(jié)本增效[8-10]。
大量研究發(fā)現(xiàn),植保無人飛機(jī)作業(yè)參數(shù)對(duì)噴霧質(zhì)量與效果有很大的影響。極飛P20無人飛機(jī)作業(yè)速度和作業(yè)高度越低在火龍果樹上的噴霧效果越好[11];影響極飛P20無人飛機(jī)霧滴在荔枝樹冠層穿透性的主要因素是作業(yè)高度[12]。TH-X60油動(dòng)無人飛機(jī)作業(yè)高度和作業(yè)速度顯著影響其在荔枝樹上的噴霧效果[13]。六旋翼植保無人飛機(jī)不同噴頭類型影響櫻桃樹冠中下層的霧滴沉積分布和均勻性[14]。3WQF120-12無人飛機(jī)作業(yè)速度越低沉積越多,對(duì)不同樹形桃樹噴霧的均勻性有顯著性差異[15]。極飛XP"20無人飛機(jī)不同作業(yè)參數(shù)對(duì)庫(kù)爾勒香梨的授粉有顯著差異[16-17]。3WYD-4-22A無人飛機(jī)作業(yè)速度為2"m/s時(shí),桃樹冠層霧滴沉積量最大[18]。韋加JF01-20無人飛機(jī)作業(yè)速度越低,在蘋果樹上的噴霧效果越好[19]。極飛XP"20無人飛機(jī)作業(yè)速度的改變對(duì)主干型紅棗花期冠層霧滴沉積密度影響最大[20]。
小型電動(dòng)多旋翼植保無人飛機(jī)具有使用成本低,操作保養(yǎng)簡(jiǎn)單,起降靈活,不需要專用的機(jī)場(chǎng)等優(yōu)點(diǎn),市場(chǎng)占有率較高。因此,本研究以小型四旋翼植保無人飛機(jī)(大疆T40)為研究對(duì)象,通過3因子3水平正交試驗(yàn),結(jié)合霧滴沉積密度、霧滴覆蓋率、均勻性等指標(biāo),優(yōu)選出適用于杧果園的四旋翼無人飛機(jī)作業(yè)參數(shù),以提高植保無人飛機(jī)霧滴在杧果冠層的有效沉積,推動(dòng)我國(guó)果樹施藥器械與技術(shù)向現(xiàn)代化、智能化、輕簡(jiǎn)化方向發(fā)展。
1.1""材料
研究對(duì)象為春梢生長(zhǎng)期的貴妃杧果樹(杧果樹平均株高2.0"m,果園行距4~6"m)。于2023年4月23日在海南省三亞市崖州區(qū)開展試驗(yàn)。
主要設(shè)備:大疆T40四旋翼電動(dòng)無人飛機(jī),載藥量為40"L,最大作業(yè)速度為7"m/s,最大有效噴幅為11"m,可調(diào)離心噴頭;AVM-01型風(fēng)速儀(臺(tái)灣泰儀電子股份有限公司);LS-204型溫濕度儀(中山市朗信電子有限公司);霧滴測(cè)試卡(重慶六六山下植??萍加邢薰荆?;衛(wèi)生紙;回形針和自封袋等。
1.2""方法
1.2.1""正交試驗(yàn)""參考植保無人飛機(jī)杧果園噴灑情況,設(shè)定噴液量為30"L/hm2,噴幅為5"m,設(shè)置3個(gè)因子(霧滴粒徑、作業(yè)高度、作業(yè)速度),每個(gè)變量為3個(gè)水平(表1),按照3因子3水平正交設(shè)計(jì),設(shè)計(jì)9組試驗(yàn),進(jìn)行T40植保無人飛機(jī)杧果園作業(yè)參數(shù)優(yōu)化試驗(yàn)。各處理的相關(guān)氣象參數(shù)見表2。
1.2.2""采樣點(diǎn)布設(shè)""隨機(jī)選擇植保無人飛機(jī)中間2條航線的3株大小、樹形相似的杧果樹進(jìn)行取樣,杧果樹的上層、下層和內(nèi)層分別按照?qǐng)D1布設(shè)霧滴測(cè)試卡。在取樣?xùn)x果冠層上層和下層的4個(gè)方位分別布設(shè)1個(gè)采樣點(diǎn),內(nèi)層自上往下布設(shè)3個(gè)采樣點(diǎn),每株樹布設(shè)11個(gè)采樣點(diǎn),每個(gè)采樣點(diǎn)分別在葉片正面和背面各布設(shè)1張霧滴測(cè)試卡,每組試驗(yàn)共布設(shè)33個(gè)采樣點(diǎn),66張霧滴測(cè)試卡。用回形針將霧滴測(cè)試卡固定在每個(gè)采樣點(diǎn)杧果葉片正面和背面。每次試驗(yàn)結(jié)束后收集霧滴測(cè)試卡。
1.3""數(shù)據(jù)處理
掃描各個(gè)處理組的霧滴測(cè)試卡,并參照ZHU等[21]的方法,使用Deposit"Scan"(V1.2)軟件進(jìn)行分析處理,獲得各個(gè)處理的霧滴沉積密度及覆蓋率。采用SPSS"20.0軟件處理數(shù)據(jù),使用最小顯著性差異法(LSD)比較差異顯著性。
變異系數(shù)(CV)可以用來表征霧滴沉積的均勻性,若變異系數(shù)與霧滴沉積分布的均勻性呈負(fù)相關(guān),則CV越小,霧滴沉積分布均勻性越好。變異系數(shù)計(jì)算公式為:
式中,S為同處理組采集樣本標(biāo)準(zhǔn)差;Xi為每個(gè)采樣點(diǎn)霧滴密度,即覆蓋率;為各處理組霧滴密度,即覆蓋率平均值;n為各處理組采樣點(diǎn)個(gè)數(shù)。
2.1""植保無人飛機(jī)霧滴在杧果樹冠層的沉積密度
結(jié)果顯示,在不同參數(shù)下,植保無人飛機(jī)霧滴在杧果樹各個(gè)冠層的沉積密度有顯著差異。在各處理中,A1B1C1(霧滴粒徑80"μm,作業(yè)高度2.0"m,作業(yè)速度3.0"m/s)處理的杧果樹冠層上層、下層和內(nèi)層葉片正面和背面的霧滴沉積密度均最大,葉片正面的霧滴沉積密度分別為82.433±"18.208、71.519±13.199、97.315±4.655個(gè)/cm2,葉片背面的霧滴沉積密度分別為8.936±3.071、23.920±6.705、20.615±0.958個(gè)/cm2,顯著高于其他處理組(Plt;0.05,表3)。
由極差分析結(jié)果顯示,影響杧果樹內(nèi)層葉片正面霧滴沉積密度的因素從大到小依次為:噴霧粒徑gt;作業(yè)速度gt;作業(yè)高度。對(duì)其余冠層葉片正面與背面霧滴沉積密度的影響從大到小依次為:噴霧粒徑gt;作業(yè)高度gt;作業(yè)速度。霧滴粒徑是影響杧果樹植保無人飛機(jī)霧滴沉積密度的主要因素,當(dāng)霧滴粒徑為80"μm,作業(yè)高度為2.0"m,作業(yè)速度為3.0"m/s時(shí),杧果各冠層的霧滴沉積密度達(dá)到最大值(表4)。根據(jù)霧滴沉積密度獲得無人機(jī)的最優(yōu)作業(yè)參數(shù)為A1B1C1。
2.2""植保無人飛機(jī)霧滴在杧果樹冠層的霧滴覆蓋率
如表5所示,無人機(jī)不同作業(yè)參數(shù)下,除杧果樹下層葉片正面的霧滴覆蓋率外,杧果樹上、下、內(nèi)層的霧滴覆蓋率有組間顯著性差異。在各處理中,A1B1C1(霧滴粒徑80"μm,作業(yè)高度2.0"m,作業(yè)速度3.0"m/s)處理的杧果樹冠層上層、下層和內(nèi)層葉片正面和背面的霧滴覆蓋率均最大,葉片正面的霧滴覆蓋率分別為(12.784±"0.173)%、(7.248±1.513)%和(11.516±2.514)%,葉片背面的霧滴覆蓋率分別為(0.412±0.163)%、(1.077±0.342)%和(0.792±0.104)%。
由霧滴覆蓋率極差分析結(jié)果顯示,作業(yè)高度是影響杧果樹下層葉片正面與內(nèi)層葉片背面霧滴覆蓋率的主要因素,作業(yè)速度是影響杧果樹上層葉片背面霧滴覆蓋率的主要因素,噴霧粒徑是影響其余各層葉片正面與背面霧滴覆蓋率的主要因素。當(dāng)無人機(jī)作業(yè)參數(shù)為霧滴粒徑80"μm,作業(yè)高度2.0"m,作業(yè)速度3.0"m/s時(shí),其霧滴覆蓋率最優(yōu)(表6)。霧滴覆蓋率與霧滴沉積密度的試驗(yàn)結(jié)果一致。
2.3""植保無人飛機(jī)霧滴在杧果樹上的均勻性
由霧滴沉積密度變異系數(shù)(CV)得出,植保無人飛機(jī)在杧果樹相同冠層水平面的霧滴分布存在較大差異(表7),A1B1C1處理中,其內(nèi)層葉片正面的均勻性最佳;A1B2C2處理中,其內(nèi)層葉片正面的均勻性最佳;A2B1C2處理中,其上層葉片正面的均勻性最佳;A2B3C1處理中,其上層葉片
背面和下層葉片背面的均勻性均較好;A1B1C1、A2B1C2、A2B3C1處理的冠層綜合均勻性相對(duì)較好。霧滴沉積密度均勻性極差分析得出,影響霧滴均勻性的因素主要是霧滴粒徑,其次是作業(yè)速度、作業(yè)高度。并且作業(yè)參數(shù)分別為霧滴粒徑80"μm,作業(yè)高度2.0"m,作業(yè)速度3.0"m/s時(shí),霧滴均勻性最好(表8)。
無人飛機(jī)的作業(yè)參數(shù)對(duì)液滴的分布和均勻性有很大影響。在植保無人飛機(jī)噴灑過程中,如果忽視作業(yè)參數(shù)優(yōu)化,使用過高的飛行速度,或者選用過高的飛行高度,不僅難以達(dá)到良好的防治效果,還會(huì)增加農(nóng)藥飄移風(fēng)險(xiǎn)[22-25]。本研究通過對(duì)霧滴沉積密度、覆蓋率、均勻性進(jìn)行分析,優(yōu)選出大疆T40型四旋翼無人飛機(jī)杧果園作業(yè)參數(shù)為霧滴粒徑80"μm,作業(yè)高度2.0"m,作業(yè)速度
3.0"m/s。植保無人飛機(jī)參數(shù)的改變,對(duì)霧滴在杧果樹不同冠層的沉積密度、覆蓋率和均勻性均有一定影響。研究發(fā)現(xiàn),植保無人飛機(jī)參數(shù)的改變,導(dǎo)致霧滴在不同果樹不同冠層的分布有顯著差異[11-20]。
作業(yè)速度和作業(yè)高度的降低可以有效減少飄移,提高液滴沉積量,從而提高噴灑質(zhì)量[12]。本研究得出相似的結(jié)論,霧滴沉積密度、覆蓋率和作業(yè)高度、作業(yè)速度存在負(fù)相關(guān)關(guān)系??赡苁怯捎跂x果采后修剪等農(nóng)事操作,春梢生長(zhǎng)期的貴妃杧果樹冠層較薄,植保無人飛機(jī)自身旋翼產(chǎn)生的風(fēng)場(chǎng)對(duì)其影響較小。較低的作業(yè)高度和作業(yè)速度,導(dǎo)致更多的噴霧霧滴向靶標(biāo)生物運(yùn)動(dòng)。然而,由于杧果種植環(huán)境、植保無人飛機(jī)機(jī)型特性、安全和效率問題,操作高度和速度不能過低。有研究發(fā)現(xiàn),飛行速度與植保無人飛機(jī)在火龍果[11]、桃樹[15]、棗樹[20]、小麥[26]和蘋果樹[19,"27]冠層霧滴沉積密度存在負(fù)相關(guān)關(guān)系;隨著植保無人飛機(jī)作業(yè)速度的提高,霧滴飄移風(fēng)險(xiǎn)也隨之增大[15,"19,"28];作業(yè)高度較低時(shí),植保無人飛機(jī)噴霧液滴在火龍果樹[11]、荔枝樹[13]的沉積密度較好。本研究發(fā)現(xiàn),植保無人飛機(jī)在杧果樹冠層的霧滴分布差異較大,影響霧滴均勻性的主要因素是霧滴粒徑。本研究結(jié)果與試驗(yàn)的天氣條件、杧果冠層大小密切相關(guān)。也有研究發(fā)現(xiàn),作業(yè)高度是影響植保無人飛機(jī)液滴在荔枝樹上分布均勻性的主要因素[12],可能是因?yàn)槔笾涔趯酉鄬?duì)較大,植保無人飛機(jī)對(duì)靶下壓風(fēng)場(chǎng)對(duì)其影響較大,所以作業(yè)高度是均勻性的主要影響因素。不同果樹的冠層特性差異較大,植保無人飛機(jī)的施藥效果也有差異。
本研究通過對(duì)T40多旋翼植保無人飛機(jī)在杧果樹冠層的霧滴沉積密度、霧滴覆蓋率、霧滴均勻性的綜合分析,得到適合杧果樹的植保無人飛機(jī)的最佳作業(yè)參數(shù)組合,研究結(jié)果為小型植保無人飛機(jī)在杧果及其他類似果園的空中噴灑作業(yè)提供一定的基礎(chǔ)指導(dǎo)。
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