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水稻機(jī)械化收獲減損技術(shù)指導(dǎo)意見

2022-06-02 10:24:41 來源:農(nóng)業(yè)農(nóng)村部農(nóng)機(jī)化總站 閱讀量:18711 評論

導(dǎo)讀:近日,農(nóng)業(yè)農(nóng)村部農(nóng)業(yè)機(jī)械化管理司、農(nóng)業(yè)農(nóng)村部農(nóng)業(yè)機(jī)械化總站、農(nóng)業(yè)農(nóng)村部農(nóng)作物生產(chǎn)全程機(jī)械化推進(jìn)專家指導(dǎo)組發(fā)布水稻機(jī)械化收獲減損技術(shù)指導(dǎo)意見。

  (2022年5月修訂)
 
  農(nóng)業(yè)農(nóng)村部農(nóng)業(yè)機(jī)械化管理司 農(nóng)業(yè)農(nóng)村部農(nóng)業(yè)機(jī)械化總站 農(nóng)業(yè)農(nóng)村部農(nóng)作物生產(chǎn)全程機(jī)械化推進(jìn)專家指導(dǎo)組
 
  本技術(shù)指導(dǎo)意見適用于聯(lián)合收割機(jī)、分段式割曬機(jī)的水稻收獲作業(yè)。在一定區(qū)域內(nèi),水稻品種及種植模式應(yīng)盡量規(guī)范一致,作物生長及田塊條件適于機(jī)械化收獲。機(jī)手應(yīng)提前檢查調(diào)試好機(jī)具,確定適宜收獲期,嚴(yán)格按照作業(yè)質(zhì)量標(biāo)準(zhǔn)和操作規(guī)程,減少收獲環(huán)節(jié)損失。
 
  一、作業(yè)前準(zhǔn)備
 
  作業(yè)前要保持機(jī)具良好工作狀態(tài),預(yù)防和減少作業(yè)故障,提高作業(yè)質(zhì)量和效率。
 
  (一)機(jī)具檢查
 
  作業(yè)季節(jié)開始前要依據(jù)產(chǎn)品使用說明書對聯(lián)合收割機(jī)進(jìn)行一次全面檢查與保養(yǎng),確保機(jī)具在整個收獲期能正常工作。檢查清理散熱器,將散熱器上的草屑、灰塵清理干凈,防止散熱器堵塞,引起發(fā)動機(jī)過熱,水箱溫度過高,應(yīng)在每個工作班次間隙及時清理。檢查空氣濾清器,每班次前檢查空氣濾清器濾網(wǎng)堵塞情況,做必要清理。檢查割臺、輸送帶及傳動軸等運(yùn)動及連接部分的緊固件和連接件,防止松動。檢查各潤滑油、冷卻液是否需要補(bǔ)充。檢查各運(yùn)轉(zhuǎn)部件及升降系統(tǒng)是否工作正常。檢查和調(diào)整各傳動皮帶的張緊度,防止作業(yè)時皮帶過度張緊或過松打滑。檢查攪龍箱體、糧倉連接部、振動篩周邊等密封性,防止連接部間隙增大或密封條破損導(dǎo)致漏糧。檢查脫粒齒、凹板篩是否過度磨損。
 
  (二)試割
 
  正式開始作業(yè)前要進(jìn)行試割。試割作業(yè)行進(jìn)長度以30米左右為宜,根據(jù)作物、田塊的條件確定適合的作業(yè)速度,對照作業(yè)質(zhì)量標(biāo)準(zhǔn)仔細(xì)檢測試割效果(損失率、含雜率和破碎率),并以此為依據(jù)對相應(yīng)部件(如風(fēng)機(jī)進(jìn)風(fēng)口開度、振動篩篩片角度、脫粒間隙、撥禾輪位置、半喂入收割機(jī)的喂入深淺、全喂入收割機(jī)的收割高度等)位置及參數(shù)進(jìn)行調(diào)整。調(diào)整后再進(jìn)行試割并檢測,直至達(dá)到質(zhì)量標(biāo)準(zhǔn)為止。作物品種、田塊條件有變化時要重新試割和調(diào)試機(jī)具。
 
  二、確定適宜收獲期
 
  準(zhǔn)確判斷確定適宜收獲期,防止過早或過遲收獲造成脫粒清選損失或割臺損失增加。針對不同田塊大小、軟硬程度、倒伏情況選擇合適的收獲機(jī)型和方式。選擇晴好天氣,及時收割。
 
  (一)根據(jù)水稻生長特征判斷確定
 
  水稻的蠟熟末期至完熟初期較為適宜收獲,此時稻谷籽粒含水量15%—28%。一般認(rèn)為,谷殼變黃、籽粒變硬、水分適宜、不易破碎時標(biāo)志著水稻進(jìn)入完熟期。水稻分段式割曬機(jī)作業(yè)一般適宜在蠟熟末期進(jìn)行。
 
  (二)根據(jù)稻穗外部形態(tài)判斷確定
 
  一般來說,水稻穗部90%以上籽粒谷殼及穗軸、枝梗轉(zhuǎn)黃、谷粒變硬時即可進(jìn)行收獲。不同類型品種,其稻穗籽粒落粒性不同,秈稻比粳稻更容易落粒。落粒性強(qiáng)的品種可以適當(dāng)早收,不易落粒的品種可以適當(dāng)晚收。在易發(fā)生自然災(zāi)害或復(fù)種指數(shù)較高的地區(qū),為搶時間,可提前至九成成熟時開始收獲。
 
  (三)根據(jù)生長時間判斷確定
 
  一般南方早秈稻適宜收獲期為齊穗后25—30天,中秈稻為齊穗后30—35天,晚秈稻為齊穗后35—40天,中晚粳稻為齊穗后40—45天;北方單季稻區(qū)齊穗后45—50天收獲。
 
  三、機(jī)收作業(yè)質(zhì)量要求和測定方法
 
  (一)作業(yè)質(zhì)量標(biāo)準(zhǔn)
 
  機(jī)收作業(yè)質(zhì)量應(yīng)符合NY/T498-2013《水稻聯(lián)合收割機(jī) 作業(yè)質(zhì)量》標(biāo)準(zhǔn)要求。
 
(二)簡易測定法
 
  推薦“半米幅寬法”和“巴掌法”。選擇自然落粒少的田塊,在收割機(jī)穩(wěn)定作業(yè)區(qū)域,往返兩個行程內(nèi)隨機(jī)選取兩個取樣區(qū),收集區(qū)域內(nèi)掉落地上的籽粒個數(shù),根據(jù)當(dāng)?shù)氐牡竟惹ЯV?或落地籽粒稱重)和平均畝產(chǎn)量估算平均損失率。
 
  1.半米幅寬法。取樣區(qū)為沿著收割機(jī)前進(jìn)方向長度為0.5米,寬為聯(lián)合收割機(jī)工作幅寬,按照公式(1)計(jì)算取樣區(qū)的損失率。
 
(1)
 
  式中:Si—第i個取樣區(qū)損失率,單位為%;Wi—為第i個取樣區(qū)落地籽粒質(zhì)量,單位為克;M—收割機(jī)工作幅寬,單位為米;L—水稻畝產(chǎn)量,單位為公斤/畝。
 
  如果沒有稱重條件,可以用往年稻谷千粒重估算落地籽粒質(zhì)量。以稻谷千粒重25克、畝產(chǎn)量500kg公斤,工作幅寬為2米的收割機(jī)為例,按照全喂入收割機(jī)標(biāo)準(zhǔn)損失率≤3.5%,“半米幅寬法”一個取樣區(qū)域內(nèi)落地籽粒應(yīng)不超過1050粒。不同水稻品種按千粒重、畝產(chǎn)量以及收割機(jī)工作幅寬確定落地籽粒判定標(biāo)準(zhǔn)粒數(shù)。
 
  2.巴掌法。用成人的手掌劃定取樣區(qū)域,面積按0.02平米計(jì),按照公式(2)計(jì)算取樣區(qū)的損失率。
 
(2)
 
  式中:Ni—第i個取樣區(qū)籽粒數(shù)量,單位為個;G—該地塊往年稻谷千粒重,單位為克。
 
  以稻谷千粒重25克、畝產(chǎn)量500公斤為例,按照全喂入收割機(jī)標(biāo)準(zhǔn)損失率≤3.5%,“巴掌法”一個取樣區(qū)域內(nèi)落地籽粒應(yīng)不超過21粒。不同水稻品種按千粒重和畝產(chǎn)量確定落地籽粒判定標(biāo)準(zhǔn)粒數(shù)。
 
  四、減少機(jī)收環(huán)節(jié)損失的措施
 
  作業(yè)前要實(shí)地察看作業(yè)田塊土地、種植品種、生長高度、植株倒伏、作物產(chǎn)量等情況,預(yù)調(diào)好機(jī)具狀態(tài)。作業(yè)過程中,嚴(yán)格執(zhí)行作業(yè)質(zhì)量要求,隨時查看作業(yè)效果,如遇損失變多等情況要及時調(diào)整機(jī)具參數(shù),使機(jī)具保持良好狀態(tài),保證收獲作業(yè)低損、高效。
 
  (一)選擇適用機(jī)型
 
  水稻生長高度為65—110厘米、穗幅差≤25厘米,或者收割難脫粒品種(脫粒強(qiáng)度大于180克)時,建議選用半喂入式聯(lián)合收割機(jī)。收割易脫粒品種(脫粒強(qiáng)度小于100克)或高留茬收獲時,建議使用全喂入收割機(jī)。作物高度超出110厘米時,可以適當(dāng)增加割茬高度,半喂入聯(lián)合收割機(jī)要適當(dāng)調(diào)淺脫粒喂入深度。
 
  (二)檢查作業(yè)田塊
 
  檢查去除田里木樁、石塊等硬雜物,了解田塊的泥腳情況,對可能造成陷車或傾翻、跌落的地方做出標(biāo)識,以保證安全作業(yè)。查看田埂情況,如果田埂過高,應(yīng)用人工在右角割出(割幅)×(機(jī)器長度)的空地,或在田塊兩端的田埂開1.2倍割幅的缺口,便于收割機(jī)順利下田。
 
  (三)正確開出割道
 
  從易于收割機(jī)下田的一角開始,沿著田埂割出一個割幅,割到頭后倒退5—8米,然后斜著割出第二個割幅,割到頭后再倒退5—8米,斜著割出第三個割幅;用同樣的方法開出橫向方向的割道。規(guī)劃較整齊的田塊,可以把幾塊田連接起來開好割道,割出三行寬的割道后再分區(qū)收割,提高收割效率。收割過程中機(jī)器保持直線行走,避免邊割邊轉(zhuǎn)彎,壓倒部分谷物造成漏割,增加損失。
 
  (四)合理確定行走路線
 
  行走路線最常用的有以下三種:1.四邊收割法。對于長和寬相近、面積較大的田塊,開出割道后,收割一個割幅到割區(qū)頭,升起割臺,沿割道前進(jìn)5—8米后,邊倒車邊向右轉(zhuǎn)彎,使機(jī)器橫過90度,當(dāng)割臺剛好對正割區(qū)后,停車,掛上前進(jìn)擋,放下割臺,再繼續(xù)收割,直到將谷物收完。2.梭形雙向收割法。對于長寬相差較大、面積較小的田塊,沿田塊兩頭開出的割道,長方向割到割區(qū)頭,不用倒車,繼續(xù)前進(jìn),左轉(zhuǎn)彎繞到割區(qū)另一邊進(jìn)行收割。3.分塊收割法??紤]集糧倉容積,根據(jù)作物產(chǎn)量,估算籽粒充滿集糧倉所需的作業(yè)長度規(guī)劃收割路徑,針對較大田塊,收割至田塊的適當(dāng)位置,左轉(zhuǎn)收割穿過田塊,把一塊田分幾塊進(jìn)行收割。
 
  (五)選擇作業(yè)速度
 
  作業(yè)過程中(包括收割作業(yè)開始前1分鐘、結(jié)束后2分鐘)應(yīng)盡量保持發(fā)動機(jī)在額定轉(zhuǎn)速下運(yùn)轉(zhuǎn),地頭作業(yè)轉(zhuǎn)彎時,應(yīng)適當(dāng)降低作業(yè)速度,防止清選篩面上的物料甩向一側(cè)造成清選損失,保證收獲質(zhì)量。當(dāng)作物產(chǎn)量超過600公斤/畝時,應(yīng)降低作業(yè)速度,全喂入聯(lián)合收割機(jī)還應(yīng)適當(dāng)增加割茬高度并減小收割幅寬。若田間雜草太多,應(yīng)考慮放慢收割機(jī)作業(yè)速度,減少喂入量,防止喂入量過大導(dǎo)致作業(yè)損失率和谷物含雜率過高等情況。
 
  (六)收割潮濕水稻及濕田作業(yè)
 
  在季節(jié)性搶收時,如遇到潮濕作物較多的情況,應(yīng)經(jīng)常檢查凹板篩、清選篩是否堵塞,注意及時清理。有露水時,要等到露水消退后再進(jìn)行作業(yè)。在進(jìn)行濕田收割前,務(wù)必仔細(xì)確認(rèn)作物狀態(tài)(倒伏角的大小)和田塊狀態(tài)(泥濘程度),收割過程中如遇到收割機(jī)打滑、下沉、傾斜等情況時,應(yīng)降低作業(yè)速度,不急轉(zhuǎn)彎,不在同一位置轉(zhuǎn)彎,避免急進(jìn)、急退,盡量減輕收割機(jī)的重量(及時排除糧倉內(nèi)的谷粒)。若在較為泥濘的濕田中收割倒伏作物或潮濕作物時,容易造成割臺、凹板篩和振動篩的堵塞,因此需低速、少量依次收割,并及時清除割刀和喂入筒入口的秸稈屑及泥土。有條件的地方可以更換半履帶,以適應(yīng)泥濘田塊正常收獲作業(yè)。
 
  (七)收割倒伏水稻
 
  收割倒伏水稻時,可通過安裝“扶倒器”和“防倒伏彈齒”裝置,盡量減少倒伏水稻收獲損失,收割倒伏水稻時放慢作業(yè)速度,原則上倒伏角小于45度時收割作業(yè)不受影響;倒伏角45—60度時撥禾輪位置前移、調(diào)整彈齒角度后傾;在倒伏角大于60度時,使用全喂入聯(lián)合收割機(jī)逆向收割,撥禾輪位置前移且轉(zhuǎn)速調(diào)至最低,調(diào)整彈齒角度后傾。
 
  (八)收割過熟水稻
 
  水稻完全成熟后,谷粒由黃變白,枝梗和谷粒都變干,特別是經(jīng)過霜凍之后,晴天大風(fēng)高溫,穗莖和枝梗易折斷,這時收獲需注意:盡量降低留茬高度,一般在10—15厘米,但要防止切割器“入泥吃土”,并且嚴(yán)禁半喂入收獲,以減少切穗、漏穗。
 
  (九)分段收獲
 
  使用分段式割曬機(jī)作業(yè)時,要鋪放整齊、不塌鋪、不散鋪,穗頭不著地,防止干濕交替,增加水稻驚紋粒,降低品質(zhì)。撿拾作業(yè)時,最佳作業(yè)期在水稻割后晾曬3—5天,稻谷水分降至14%左右時,要求不壓鋪、不丟穗、撿拾干凈。
 
  (十)規(guī)范作業(yè)操作
 
  作業(yè)時應(yīng)根據(jù)作物品種、高度、產(chǎn)量、成熟程度及秸稈含水率等情況來選擇前進(jìn)擋位,用作業(yè)速度、割茬高度及割幅寬度來調(diào)整喂入量,使機(jī)器在額定負(fù)荷下工作,盡量降低夾帶損失,避免發(fā)生堵塞故障。要經(jīng)常檢查凹板篩和清選篩的篩面,防止被泥土或潮濕物堵死造成糧食損失,如有堵塞要及時清理。收割作業(yè)結(jié)束后糧箱存糧,要及時卸凈。
 
  (十一)在線監(jiān)測
 
  提升裝備智能化水平,可在小麥聯(lián)合收割機(jī)上裝配損失率、含雜率、破碎率在線監(jiān)測裝置。機(jī)手根據(jù)在線監(jiān)測裝置提示的相關(guān)指標(biāo)、曲線,適時調(diào)整作業(yè)速度、喂入量、留茬高度等作業(yè)狀態(tài)參數(shù),得到并保持損失率、含雜率、破碎率較理想的作業(yè)狀態(tài)。
 
  五、培訓(xùn)與監(jiān)督
 
  (一)開展收獲技術(shù)培訓(xùn)
 
  機(jī)手、種植戶和從事收獲質(zhì)量監(jiān)督的鄉(xiāng)鎮(zhèn)農(nóng)機(jī)管理人員應(yīng)經(jīng)過培訓(xùn),掌握水稻品種、籽粒含水率、種植模式、收割地形等方面的知識,掌握聯(lián)合收割機(jī)的正確使用、維護(hù)保養(yǎng)知識以及作業(yè)質(zhì)量標(biāo)準(zhǔn)要求。
 
  (二)加強(qiáng)作業(yè)質(zhì)量監(jiān)督
 
  鼓勵種植戶與機(jī)手簽訂收獲作業(yè)損失協(xié)議,農(nóng)機(jī)管理人員可通過巡回檢查監(jiān)督作業(yè)損失等情況,并在損失偏大或出現(xiàn)其他不合乎要求情形時,要求機(jī)手對聯(lián)合收割機(jī)進(jìn)行調(diào)整,仍不合要求的,應(yīng)及時更換故障部件或整機(jī)。
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