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大豆生長后期“四防一促”奪豐收技術(shù)意見

2022-08-31 10:04:56 來源：農(nóng)業(yè)農(nóng)村部 閱讀量：17520 評論

　　【農(nóng)機(jī)網(wǎng) 熱點(diǎn)關(guān)注】當(dāng)前，“處暑”已過，南方夏大豆正值開花期，北方春大豆處于鼓粒期，是大豆產(chǎn)量形成關(guān)鍵期。據(jù)氣象部門預(yù)測，今年南方地區(qū)華西秋雨出現(xiàn)時(shí)間早、較常年同期偏強(qiáng)、空間分布不均，可能出現(xiàn)旱澇急轉(zhuǎn)情況；北方地區(qū)秋汛預(yù)期較重，早霜、臺風(fēng)威脅較大，大豆后期生產(chǎn)形勢不容樂觀。要加強(qiáng)大豆后期田間管理，以防漬澇、防低溫、防倒伏、防病蟲、促早熟“四防一促”為重點(diǎn)，全力以赴防災(zāi)抗災(zāi)奪大豆豐收。
 
　　(一)防漬澇。雨后及時(shí)疏通溝渠，搶排積水，降低田間土壤濕度，預(yù)防漚根爛根，減輕漬害影響。對受災(zāi)地塊及時(shí)清理植株，視倒伏程度扶正培直護(hù)根，促進(jìn)恢復(fù)生長。大豆經(jīng)過水淹，土壤養(yǎng)分大量流失，同時(shí)根系吸收能力衰弱，應(yīng)及時(shí)追肥增加產(chǎn)量。絕收地塊可及時(shí)改種速生蔬菜等短生育期作物，盡量彌補(bǔ)災(zāi)害損失。
 
　　(二)防低溫。密切關(guān)注氣溫變化趨勢，采取葉面噴施蕓苔素內(nèi)酯等生長調(diào)節(jié)劑，增強(qiáng)植株抗寒能力，切實(shí)防范早霜和寒露風(fēng)等低溫冷害。對墑情偏差的地塊，因地制宜補(bǔ)水改善土壤墑情，做到以水調(diào)溫。對發(fā)生低溫凍害、產(chǎn)量減產(chǎn)的地塊，可適時(shí)晚收，延長后熟時(shí)間，穩(wěn)定大豆產(chǎn)量。
 
　　(三)防倒伏。適時(shí)追施鉀肥增強(qiáng)大豆植株抗倒能力，盡量降低產(chǎn)量損失。遭遇大風(fēng)、冰雹造成倒伏的地塊，要根據(jù)倒伏程度，因地因情施策。對嚴(yán)重倒伏(植株倒伏于地)的地塊，不要人工扶起，以免植株折斷，造成更大的產(chǎn)量損失。對輕度倒伏的地塊，可人工適當(dāng)扶起，兩行對扶，并培土施肥，促進(jìn)恢復(fù)生長。
 
　　(四)防病蟲。堅(jiān)持病蟲兼治、以防為主，切實(shí)做好病蟲害綜合防控。東北地區(qū)重點(diǎn)防治食心蟲，黃淮海地區(qū)和西北地區(qū)重點(diǎn)防治點(diǎn)蜂緣蝽和煙粉虱，南方地區(qū)重點(diǎn)防治斜紋夜蛾、高隆象和銹病等。在病蟲防治過程中，可與噴施葉面肥、調(diào)節(jié)劑同時(shí)作業(yè)，實(shí)現(xiàn)防病、防蟲、減災(zāi)、提質(zhì)、增產(chǎn)的多重效果。
 
　　(五)促早熟。可葉面噴施磷酸二氫鉀補(bǔ)充養(yǎng)分，同時(shí)根據(jù)土壤缺素情況適當(dāng)增施鉬酸銨、硼砂等微肥，噴施時(shí)間以下午4點(diǎn)后為宜。此外，通過拔凈田間大草，增加田間通風(fēng)透光，可促進(jìn)大豆生長發(fā)育。
 
　　國家大豆和油料產(chǎn)能提升工程大豆專家指導(dǎo)組
 
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