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2024年黃淮海夏大豆生產技術指導意見

2024-06-05 09:37:24 來源:全國農業技術推廣服務中心 閱讀量:16035 評論

  【農機網 熱點關注】 當前,黃淮海地區冬小麥正由南向北陸續成熟收獲,夏大豆即將搶時搶墑播種。針對黃淮海地區自然條件和生產方式,農業農村部大豆專家指導組會同全國農業技術推廣服務中心,制定了2024年黃淮海夏大豆生產技術指導意見,旨在助力黃淮海地區大豆大面積單產提升。
 
  選用優良品種  做好種子處理
 
  所選品種應通過當地審定或引種備案,嚴禁跨生態區引種。根據市場需求和生產條件,宜選擇高產、優質、抗倒性好、抗病性強、適合機械化收獲的中小粒型大豆品種,推薦種植高油高產品種;播種質量高的農戶建議選用株型收斂的耐密品種。播前做好種子精選,剔除病斑粒、蟲蝕粒、破瓣粒和雜質,確保種子飽滿、活力強。近幾年黃淮海地區大豆根腐病、擬莖點種腐病等土傳病害呈加重趨勢,建議選用精甲霜靈?咯菌腈為基礎配方的種衣劑進行包衣,提高大豆保苗率。
 
  搶墑造墑播種  提高出苗質量
 
  麥收后土壤墑情適宜時搶墑播種;墑情不足時造墑播種或播后噴灌補墑;有水肥一體化條件的地塊建議“干播濕出”。可采用小麥低茬收割、秸稈粉碎拋撒后免耕播種;小麥秸稈量大且土壤含水量較低的田塊,打捆部分秸稈離田防止播種機堵塞,土壤較濕時不宜打包,防止車輛反復碾軋壓影響播種質量;有條件地區建議選擇免耕覆秸精量播種機播種,一次性完成播種、側深施肥、封閉除草、秸稈覆蓋等作業。所選播種機應具有仿型部件,保證播種深度一致。播種深度一般3~5厘米,土壤粘重地塊適當淺播。根據品種特性及生產條件等確定適宜種植密度。一般地塊畝保苗1.2萬~1.5萬株,土壤水肥條件較好地塊可適當提高種植密度;耐密品種或者晚播地塊應適當增加密度。
 
  強化精準施藥  減少產量損失
 
  免耕覆秸精量播種可同時進行封閉除草;無封閉除草或封閉除草效果不理想的田塊,可在大豆2~3片復葉期進行苗后除草。黃淮片區主要蟲害有甜菜夜蛾、斜紋夜蛾、點蜂緣蝽、造橋蟲、蚜蟲、紅蜘蛛、葉蟬、煙粉虱等,重點加強點蜂緣蝽等刺吸蟲害動態監測和預報預警,蟲口達到閾值地塊施用噻蟲嗪或吡蟲啉可濕性粉劑田間噴霧防控,防止“癥青”發生,有條件地區開展統防統治。規范噴藥時機、方法和用量,避免重噴、漏噴,降低藥害發生,提高防控效果。
 
  水肥前控后促  提高大豆產量
 
  黃淮南部地區播種時應注意開好“三溝”,預防澇害、漬害發生。大豆苗期適當控水,促進大豆根系下扎;花莢鼓粒期時如遇干旱天氣,及時滴灌或噴灌補水,促進大豆結莢和鼓粒。提倡結合播種側深施肥(10厘米左右),可每畝施用復合肥15~20公斤;結莢鼓粒期長勢偏弱地塊,利用水肥一體化設施或結合害蟲防治噴施尿素,增加單株有效莢數、單株粒數和百粒重,提高產量;對旺長田塊,于分枝期或初花期可每畝用縮節胺20毫升兌水20公斤噴施或15%多效唑50克兌水40~50公斤噴施,控制節間伸長,防止倒伏。
 
  低損高質收獲  確保豐產豐收
 
  大豆適時收獲,當植株葉片基本脫落、搖動時有響鈴聲、籽粒含水量降為18%以下時進行機械收獲。收獲時避開露水,防止籽粒粘附泥土,影響外觀品質;避開中午高溫時段,以免炸莢造成損失。開始作業前要保持機具良好技術狀態,減少作業故障,提高工作質量和效率。以不漏莢為原則,盡量放低割臺。建議選用大豆專用收割機或者配備大豆專用收獲專用割臺的收割機收獲。使用稻麥收割機收獲時,確保使用大豆專用篩子;注意調整撥禾輪轉速,減輕對植株的擊打力度,減少落莢、落粒;正確選擇和調整脫粒滾筒的轉速與間隙,降低大豆籽粒的破損率;適當調大風門,利于減少雜質。
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