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2024年山西省大豆生產技術指導意見

2024-04-02 13:47:32 來源:山西省農業農村廳 閱讀量:17810 評論

  【農機網 地方農機】 為切實加強技術支撐,進一步提升我省大豆生產水平,結合氣象條件和生產實際,特制定2024年山西省大豆生產技術指導意見。
 
  一、選擇良種
 
  根據當地生態條件和市場需求,選擇熟期合適、優質高產、抗病抗倒、適宜機收的大豆品種,防止越區種植。晉北地區選用生育期相對較短的早熟品種,如:晉豆15號、晉豆25號、晉科5號、晉科7號、同豆8181、長豆34、東豆一號等;中部地區選用晉豆19、晉大74、晉遺51、晉遺52、晉遺53、汾90024、汾豆78、汾豆93、汾豆98、品豆24、長豆34等品種;晉西干旱區選用晉豆21、汾豆62等品種;南部復播區選用汾豆56、汾豆79、運豆101、晉豆50、長豆35號等品種。
 
  二、選地整地
 
  合理輪作倒茬,前茬最好是禾本科作物,如小麥、高粱、玉米等。無深翻深松基礎的地塊,進行秋翻或深松整地;秋季未整地地塊,如遇干旱或上一年有深翻深松基礎,應采取免耕播種。
 
  三、搶墑播種
 
  根據土壤溫度、墑情,適時適墑機械播種。北部春播區
 
  可采用地膜覆蓋技術,適時搶墑早播。南部復播區可采用免耕覆秸精量播種機,一次性完成播種、施肥、封閉除草、秸稈覆蓋等作業。播前曬種1~2天,可用根瘤菌拌種。春大豆播期以4月下旬~5月上旬為宜,復播大豆在小麥收獲后6月中下旬播種。
 
  播種密度根據品種特性、水肥條件及栽培方式而定。建議精量播種,春播高水肥地塊每畝留苗0.6萬~0.8萬株,種子量為3~4公斤/畝,旱地為1.0萬~1.2萬株/畝,種子量5公斤/畝。復播區畝留苗1.2萬~1.4萬株,播種量6~7公斤/畝。可采用40厘米等行距種植或采用寬窄行種植,寬行60厘米、窄行40厘米,株距15厘米左右。
 
  四、田間管理
 
  (一)間苗定苗。在大豆出苗對生真葉展開至第1片復葉展開前進行人工間苗,按計劃密度定苗。
 
  (二)中耕管理。生育期進行2~3次中耕,大豆剛長出真葉時中耕一次,以后每隔10天左右再中耕1~2次。根據土壤是否板結及雜草多少靈活掌握中耕次數。
 
  (三)水肥管理。在水地種植大豆,要灌足底墑水,以保全苗;控制幼苗水,適當蹲苗;飽澆花莢水,以增花保莢,同時防止花莢期雨水過量而倒伏。有條件的地方根據當時旱情和生長發育需水規律進行滴噴灌。堅持科學施肥,底肥施入70%的化肥,施肥深度10~15厘米;剩余30%的化肥作種肥施入,深度為4~5厘米;鼓勵結合整地施農家肥。對旺長田塊,在分枝期或初花期噴施生長調節劑,控制節間伸長,防止倒伏。
 
  (四)雜草防除。根據當地雜草種類,選擇安全、高效、低毒的化學除草劑。土壤水分較好的地塊提倡封閉除草,在播種后出苗前進行;土壤水分較差或封閉除草效果不佳時,可在大豆苗后2~3葉期進行莖葉除草。操作時應嚴格按劑量要求噴灑,減少對下茬作物的影響。
 
  (五)病蟲害防治。以豆莢螟、食心蟲、蚜蟲、霜霉、灰斑等病蟲害為防治重點,堅持“預防為主,綜合防治”的方針,加強農業防治、生物防治、物理防治和化學防治的協調與配套,嚴格控制化學農藥的施用量。藥劑篩選和病蟲害防治按照說明書或在農技部門指導下進行。
 
  五、適時收獲
 
  機械收獲的最佳時期應在完熟初期,此時大豆葉片全部脫落;人工收獲在落葉達90%時進行。建議選用大豆專用收割機,調整相關參數,減少落莢、落粒,降低籽粒破損率和損失率。
 
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