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黑龍江省大豆中后期田間管理技術指導意見
2024-07-31
08:44:02
來源:黑龍江省農業農村廳 閱讀量:17836
評論
【農機網 熱點關注】 目前我省大豆正值花莢期,局部毀種地塊也進入開花期,做好中后期田間管理對保證大豆豐產增收至關重要。據氣象部門預測,8月份全省降水多于常年,局部區域可能發生強降雨,易于大豆病害的發生。為進一步做好大豆中后期田間管理,提高大豆單產和品質,提出以下技術指導意見。
一、抗漬澇
1. 加強監測預報和預防工作。各級農業部門要加強與氣象、水利部門會商,及時監測預報澇害發生的時間、范圍和程度,做好預案。低洼易澇地塊,提前做好開溝、清淤、疏通溝渠河道等排水措施,減輕濕漬對根系的傷害,預防大豆倒伏。
2. 補施肥料。受澇地塊排水后,造成土壤養分流失,易出現脫肥現象,要及時葉面噴施磷酸二氫鉀等葉面肥,有條件的地塊也可增施硼、鉬、鋅等微量元素,連續噴施2~3次,延緩葉片功能期,保花保莢和促進籽粒建成,有利于產量形成。
二、科學防控病蟲害
1.病害防控。八月份多雨易誘發大豆菌核病等病害,發現大豆菌核病中心病株及時拔除,帶出田外深埋處理,并對中心病株周圍噴藥保護或全田施藥,防止病情擴散,可使用腐霉利、菌核凈、咪鮮胺等藥劑進行防治。防治大豆灰斑病、霜霉病等后期葉部病害,可使用嘧菌酯、咪鮮胺等廣譜性藥劑,做到“一噴多防”。
2.蟲害防控。食心蟲是大豆后期的主要蟲害,對產量和品質危害較大,應重點防控。對田間成蟲調查達到防治指標的田塊,選用高效、低毒綠色農藥進行防控,可使用無人機航化作業、與噴施葉面肥結合,實現“一噴多效”。
三、防倒伏
根據倒伏時期和倒伏程度,因地因情施策。嚴重倒伏地塊,不要再人工扶起,以免植株折斷,造成更大的產量損失。輕度倒伏的可以人工適當扶起,兩行對扶,并培土施肥,促使新根迅速下扎,可施用鉀肥增強大豆植株抗倒能力,盡量降低產量損失。
四、促早熟
目前毀種大豆地塊處于開花期,生育進程延后,要及時中耕培土、防除雜草、增強土壤滲透性,促進大豆生長。在大豆鼓粒期,采用噴施磷酸二氫鉀等葉面肥、補充硼等微量元素來緩解大豆養分供需矛盾,可使大豆提早成熟3~5天,防止大豆貪青、促進籽粒飽滿。
五、拔大草
在大豆鼓粒期,對于田間大草比較多的地塊,草籽形成前拔一遍大草,以利于大豆通風、透光,增加莢數和粒重,促熟增產。而且對于收獲、晾曬、脫粒均有益處,還可以減少下茬作物田間雜草,避免機械收獲造成“草花臉”影響大豆商品品質。
六、防早霜
大豆成熟前,密切關注天氣變化趨勢,預報有早霜發生,應在凌晨2~3時,當氣溫降到作物受害的臨界溫度1~2℃時,采取人工熏煙的方法防早霜。在地塊的上風口,放置秸稈、樹葉、雜草等點燃,慢慢熏燒,使大豆籠罩在煙霧中,提高近地面溫度1~2℃,改變局部環境,降低霜凍危害。熏煙堆要密,分布要均勻,盡量使煙霧控制整個田面。尤其對低洼和毀種大豆的地塊,進行重點實施。
七、適時收獲
大豆莖稈呈棕黃色,雜有少數棕杏黃色,豆葉全部落盡,子粒已歸圓時,適時進行機械收獲,同時粉碎秸稈,實施還田。低洼地塊,在大豆成熟前及時開溝、清淤,清除田間積水,便于機車進地適時收獲;收獲時田間仍有積水的地塊,宜采用履帶式
收獲機作業。
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