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農業機械化管理司關于印發大豆機械化收獲減損技術指導意見的函
2021-09-24
10:12:13
來源:農機化司 閱讀量:19866
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【農機網 通知公告】 農機科〔2021〕93號
各省、自治區、直轄市及計劃單列市農業農村(農牧)廳(局、委),新疆生產建設兵團農業農村局,北大荒農墾集團有限公司,廣東省農墾總局,各有關單位:
為貫徹落實習近平總書記關于“厲行節約、反對浪費”重要指示精神和《農業農村部辦公廳關于將機收減損作為糧食生產機械化主要工作常抓不懈的通知》(農辦機〔2021〕10號)要求,強化“減損就是增產”意識,毫不放松抓好秋糧作物機械化生產,進一步減少糧食機械化收獲損失,我司組織農業農村部農業機械化總站和農作物生產全程機械化推進專家指導組制定了大豆機械化收獲減損技術指導意見,現印發給你們。請結合實際,加強作業質量標準宣貫和技術培訓指導,切實推進糧食機收提質減損工作,力爭“顆粒歸倉”,為保障國家糧食安全提供更有力的機械化支撐。
農業農村部農業機械化管理司
2021年9月16日
大豆機械化收獲減損技術指導意見
農業農村部農業機械化管理司
農業農村部農業機械化總站
農業農村部農作物生產全程機械化推進專家指導組
(2021年9月)
本技術指導意見適用于大豆機械化聯合收獲和分段收獲。在一定區域內,大豆品種及種植模式應盡量規范一致,大豆及田塊條件適于機械化收獲,農機手應選擇與大豆種植行距、適宜收獲方式對應的
收割機并提前檢查調試好機具,確定適宜收獲期,嚴格按照大豆機收作業質量標準和操作規程,注意安全生產,減少收獲環節損失,提高生產作業質量和效率。
一、作業前機具檢查調試
開始作業前要保持機具良好技術狀態,預防和減少作業故障,提高工作質量和效率。應做好以下檢查準備工作。
(一)機具檢查
駕駛操作前要檢查各操縱裝置功能是否正常;
離合器、制動踏板自由行程是否適當;
發動機機油、冷卻液是否適量;儀表板各指示是否正常;輪胎氣壓是否正常;傳動鏈、張緊輪是否松動或損傷,運動是否靈活可靠;檢查和調整各傳動皮帶的張緊度,防止作業時皮帶打滑;重要部位螺栓、螺母有無松動;有無漏水、滲漏油現象;割臺、機架等部件有無變形等,機械收割保證刀片鋒利,人工收割刀要磨快,減少損失。備足備好田間作業常用工具、零配件、易損件及油料等,以便出現故障時能夠及時排除。
(二)試割
正式開始作業前要選擇有代表性的地塊進行試割。試割作業行進長度以50米左右為宜,根據作物、田塊的條件確定適合的作業速度,對照作業質量標準仔細檢測試割效果(損失率、破碎率、含雜率,有無漏割、堵塞、跑漏等異常情況),并以此為依據對相應部件(如撥禾輪轉速、撥禾輪位置、割刀頻率、脫粒滾筒轉速、脫粒間隙、導流板角度、作業速度、風機轉速、風門開度、篩子開度、振動篩頻率等)進行調整。調整后再進行試割并檢測,直至達到質量標準和農戶要求為止。作物品種、田塊條件有變化時要重新試割和調試機具。試割過程中,應注意觀察、傾聽機器工作狀況,發現異常及時解決。
二、確定適宜收獲期
準確判斷確定適宜收獲期,防止過早或過晚收獲對大豆的產量和品質產生不利影響,實現大豆豐產增收。
(一)機械聯合收獲期的確定
機械收獲的最佳收獲期在黃熟期后至完熟期之間,此期間大豆籽粒含水率在15%—25%,莖稈含水率45%—55%,豆葉全部脫落,豆粒歸圓,搖動大豆植株會聽到清脆響聲。
(二)分段收獲期的確定
分段收獲方式的最佳收獲期為黃熟期,此時葉片脫落70%—80%,籽粒開始變黃,少部分豆莢變成原色,個別仍呈現青綠色。
(三)選擇適宜作業時段
收割大豆應該選擇早、晚時間段收割;避開露水時段,以免收獲的大豆產生“泥花臉”;避開中午高溫時段,以免炸莢造成損失。
三、減少機收環節損失的措施
作業前要實地察看作業田塊、種植品種、自然高度、植株倒伏、大豆產量等情況,調試好機具狀態。作業過程中,嚴格執行作業質量要求,隨時查看作業效果,發現損失變多等情況要及時調整機具參數,使機具保持良好狀態,保證收獲作業低損、高效。
(一)檢查作業田塊
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、跌落的地方做出標識,以保證安全作業。對地塊中的溝渠、田埂﹑通道等予以平整,并將地里水井、電桿拉線、樹樁等不明顯障礙進行標記。
(二)選擇合適的收獲方式
東北春大豆及黃淮海夏大豆產區宜選擇聯合收獲方式,南方大豆產區依據種植模式和天氣情況,合理選擇聯合收獲方式與分段收獲方式。
1.聯合收獲
采用聯合收割機直接收獲大豆,首選專用大豆聯合收割機,也可以選用多用聯合收割機或借用小麥聯合收割機,但一定要更換大豆收獲專用的撓性割臺。大豆機械化收獲時,要求割茬高度一般在4—6厘米,要以不漏莢為原則,盡量放低割臺。為防止炸莢損失,要保證割刀鋒利,割刀間隙需符合要求,減少割臺對豆枝的沖擊和拉扯;適當調節撥禾輪的轉速和高度,一般早期的豆枝含水率較高,撥禾輪轉速可適當提高,晚期的豆枝含水率較低,撥禾輪轉速需要相對降低,并對撥禾輪的輪板加橡皮等緩沖物,以減小撥禾輪對豆莢的沖擊。在大豆收割機作業前,根據豆枝含水率、喂入量、破碎率、脫凈率等情況,調整機器作業參數。一般調整脫粒滾筒轉速為500—700轉/分,脫粒間隙30—35毫米。在收獲時期,一天之內豆枝和籽粒含水量變化很大,同樣應根據含水量和實際脫粒情況及時調整滾筒的轉速和脫粒間隙,降低脫粒破損率。要求割茬不留底莢,不丟枝,機收作業時按照《大豆聯合收割機 作業質量》NY/T 738-2020標準執行,損失率≤5%,含雜率≤3%,破碎率≤5%,莖稈切碎長度合格率≥85%,收割后的田塊應無漏收現象。
2.分段收獲
分段收獲有收割早、損失小,炸莢、豆粒破損和泥花臉少的優點。割曬放鋪要求連續不斷空,厚薄一致,大豆鋪底與機車前進方向呈30度角,大豆鋪放在壟臺上,豆枝與豆枝之間相互搭接,以防拾禾掉枝,做到底莢割凈、不漏割,揀凈,減少損失。割后5—10天,籽粒含水量在15%以下,及時拾禾脫粒。要求綜合損失不超過3%,拾禾脫粒損失不超過2%,收割損失不超過1%。
(三)選擇適用機型
1.北方春大豆產區
主要采用大型大豆聯合收割機或改裝后的大型自走式稻麥聯合收割機。
2.黃淮海夏大豆產區
主要采用中型的輪式大豆收割機或改裝后的小麥聯合收割機。
3.南方大豆產區
主要采用小型履帶式大豆聯合收割機或改裝后的水稻聯合收割機。
4.機具調整
改裝后的稻麥聯合收割機用于收割大豆,應注意適合于大豆收割的關鍵作業部件更換和作業參數調整。
(1)大豆專用割臺。更換適合于大豆收割的撓性割臺,并依據收獲大豆植株高度調整撥禾輪前后位置、上下位置,依據收獲大豆底莢高度調整割臺高度使割刀離地高度約5—10厘米。
(2)脫粒分離系統。更換適合于大豆收獲作業的脫粒分離系統,中小型聯合收割機建議采用閉式弓齒脫粒滾筒,大型聯合收割機建議采用“紋桿塊+分離齒”式復合脫粒滾筒,凹板篩建議采用圓孔凹板篩,脫粒滾筒與凹板篩在結構、尺寸上應做到匹配,確保脫粒間隙在30—35毫米。
(3)清選系統。中小型聯合收割機可采用常規魚鱗篩,以調整風機轉速、魚鱗篩開度等清選作業參數為主,有條件的可改裝導風板結構,增加風道數量至3個;大型聯合收割機建議使用加長魚鱗篩,有條件的可在篩面安裝逐稿輪。
(4)籽粒輸送系統。更換適合于大豆低破碎的輸送系統,升運器建議采用勺鏈式升運器,復脫攪龍建議采用尼龍材質攪龍。
(四)正確開出割道
作業前必須將要收割的地塊四角進行人工收割,按照機車的前進方向割出一個機位。然后,從易于機車下田的一角開始,沿著田的右側割出一個割幅,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收割,提高收割效率。
(五)選擇行走路線
行走路線最常用的有以下兩種: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頭,升起割臺,沿割道前進5—8米后,邊倒車邊向右轉彎,使機器橫過90度,當割臺剛好對正割區后,停車,掛上前進擋,放下割臺,再繼續收割,直到將大豆收完。2.左旋收割法。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,長方向割到割區頭,不用倒車,繼續前進,左轉彎繞到割區另一邊進行收割。
(六)選擇作業速度
作業過程中應盡量保持發動機在額定轉速下運轉,機器直線行走,避免邊割邊轉彎,壓倒部分大豆造成漏割,增加損失。地頭作業轉彎時,不要松油門,也不可速度過快,防止清選篩面上的大豆甩向一側造成清選損失,保證收獲質量。若田間雜草太多,應考慮放慢收割機前進速度,減少喂入量,防止出現堵塞和大豆含雜率過高等情況。
(七)收割潮濕大豆
在季節性搶收時,如遇到潮濕大豆較多的情況,應經常檢查凹板篩、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行作業。
(八)收割倒伏大豆
收獲倒伏大豆時,可通過安裝“扶倒器”和“防倒伏彈齒”裝置,盡量減少倒伏大豆收獲損失,收割倒伏大豆時應先放慢作業速度,原則上倒伏角小于45度時順向作業;倒伏角45度—60度時逆向作業;在倒伏角大于60度時,要盡量降低收割速度。
(九)規范作業操作
作業時應根據大豆品種、高度、產量、成熟程度及秸稈含水率等情況來選擇作業擋位,用作業速度、割茬高度及割幅寬度來調整喂入量,使機器在額定負荷下工作,盡量降低夾帶損失,避免發生堵塞故障。收割采用“對行盡量滿幅”原則,作業時不要“貪寬”,收割機的分禾器位置應位于行與行之間,避免收割機的行走造成大豆的拋撒損失。采用履帶式收割機作業的時候,要針對不同濕度的田塊對履帶張緊度進行調整,泥濘地塊適當調緊一些,干燥地塊適當調松,以提高機具通過能力、減少履帶磨損。要經常檢查凹版篩和清選篩的篩面,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。
(十)在線監測
有條件的可以在收割機上裝配損失率、含雜率、破碎率在線監測裝置,駕駛員根據在線監測裝置提示的相關指標、曲線,適時調整行走速度、喂入量、留茬高度等作業狀態參數,以保持低損失率、低含雜率、低破碎率的良好作業狀態。
四、培訓與監督
機手、種植戶和從事收獲質量監督的鄉鎮農機管理人員應經過培訓,掌握大豆品種、含水率、種植模式、收割地形等方面的農藝知識,掌握收割機的正確使用、維護保養知識以及作業質量標準要求。鼓勵種植戶與機手簽訂收獲作業損失協議,鄉鎮農機管理人員可通過巡回檢查監督作業損失等情況,并在損失偏大或出現其它不合乎要求情形時,要求機手調整,仍然不合要求的,應更換作業機器。
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