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寧夏農機推廣站制定倒伏水稻機械化收獲減損技術指引
2024-10-10
08:43:19
來源:寧夏農業機械化技術推廣站/技術推廣科 閱讀量:15736
評論
【農機網 科技創新】 當前,寧夏水稻機械化收獲已進入關鍵時期,為有效應對風雨天氣對水稻產量造成的損失,科學開展秋季收獲,減少倒伏水稻收獲損失,確保秋糧顆粒歸倉,寧夏農業機械化技術推廣站制定倒伏水稻機械化收獲減損技術指引,加強技術指導與服務。
一、選擇適宜收獲方式和機具。機械化收獲作業前,實地觀察水稻倒伏情況,科學選擇
收獲機具。收獲倒伏水稻時,半喂入
谷物聯合收割機作業效果一般優于全喂入谷物
聯合收割機。嚴重倒伏且倒伏方向一致,應優先選用半喂入機型。倒伏不嚴重且倒伏方向交錯,可選用全喂入機型。
二、提前檢查和調試機具。由于收獲倒伏水稻難度大,對作業機具的要求更高,要全面檢查調整好機具,保證收獲機各系統運轉正常。一是倒伏角小于45度時,對收獲作業影響有限,一般不進行特殊處理。二是倒伏角大于45度小于60度時,如選用半喂入機型,應采用順向收獲或側向收獲方式;如選用全喂入機型,應采用逆向收獲或側向收獲方式。三是倒伏角大于60度,均應采用順向收獲或側向收獲方式,選用全喂入機型還應加裝“扶倒器”同時更換“防倒伏彈齒”,并調整撥禾輪與割刀的相對位置,調整彈齒角度后傾,將割臺降至適宜高度。
三、選擇適宜收獲期。適期收獲可增加粒重、減少損失、提高產量和品質。作業前,應準確判斷確定適收期,過早或過遲收獲會增加損失率和破碎率。如遇自然災害等特殊情況,可適當提前收獲。
四、選擇作業方式。下地前,仔細觀察水稻倒伏程度,針對性地采取作業方式。一是提前規劃行走路線。水稻收獲作業一般采用向心回轉法,作業前,提前查看地塊,對地塊中的溝渠、田埂、通道等予以平整,并將水井、墳頭、電桿拉線、樹樁等不明顯障礙進行標記,據此合理規劃路線,科學避讓。作業時,如有必要,可提前開出收割道。二是合理控制作業速度。根據機型特點、水稻產量、植株密度、自然高度、干濕程度、留茬高度等因素選擇合理的作業速度。當作物密、植株大、產量高、地塊起伏不平、早晚及雨后作物濕度大時,應適當降低作業速度。一般先低速收獲,然后逐步提高至正常作業速度。嚴禁使用行走擋位進行收獲作業,低速行駛作業時,不能降低發動機轉速。三是科學規范駕駛操作。作業時,通過調整作業速度和幅寬實時控制喂入量,使機具在額定負荷下工作,降低夾帶損失,避免發生堵塞故障。注意幅寬銜接,避免相鄰兩個作業帶之間出現漏收損失。地頭轉彎時,應停止作業,采用倒車法轉彎或兜圈法直角轉彎,直線行駛后再開始作業。注意地頭、邊角和障礙物附近作物收獲情況,做到應收盡收,減少損失。
五、及時烘干和收儲。收獲后的水稻稻谷含水率如未達到儲藏要求,應及時烘干。烘干作業應遵循就近原則,提前聯系烘干地點,統籌安排,合理拉運,隨收隨烘,避免濕糧長時間堆放。水稻宜采用低溫烘干,可選用循環式或連續式烘干機。烘干前,應進行初清,達到含雜率≤2%且不得有長莖稈、麻袋繩、塑料薄膜等雜物的要求。應測定谷物初始含水率,同一批烘干的谷物水分不均度應≤3%。烘干時,水稻籽粒溫度一般不超過40℃,最高不超過43℃,應控制干燥速率不大于1.5%/h,防止爆腰率增大。烘干后,谷物色澤氣味應無明顯變化,無熱損傷粒、焦糊粒。
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