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徐州出臺(tái)春季麥田化學(xué)除草技術(shù)意見(jiàn)

2023-02-22 09:36:56 來(lái)源：江蘇省徐州市農(nóng)機(jī)推廣站 閱讀量：22746 評(píng)論

　　【農(nóng)機(jī)網(wǎng) 熱點(diǎn)關(guān)注】隨著氣溫逐步回升，麥田雜草即將進(jìn)入快速生長(zhǎng)期，強(qiáng)化草情監(jiān)測(cè)，搶抓有利時(shí)機(jī)，迅速開(kāi)展麥田化學(xué)除草，保障小麥生長(zhǎng)安全。
 
　　一、當(dāng)前麥田雜草發(fā)生情況
 
　　徐州今年冬季整體氣溫偏高，當(dāng)前麥田雜草偏重發(fā)生，主要表現(xiàn)為：一是雜草密度高。2月6-7日普查，全市田間禾本科雜草平均密度13.7株/平方尺，未防除田塊最高達(dá)305株/平方尺，闊葉雜草平均密度11.6株/平方尺，未防除田塊最高達(dá)87株/平方尺。二是發(fā)生面積大。全市雜草發(fā)生面積339萬(wàn)畝，其中需防面積達(dá)162萬(wàn)畝。三是不平衡性大?？傮w來(lái)看，東南部麥區(qū)雜草發(fā)生密度高于西北部麥區(qū)、稻茬麥區(qū)高于旱茬麥區(qū)，冬前未采取土壤封閉處理的田塊雜草密度明顯高于土壤封閉處理過(guò)的田塊。未來(lái)一段時(shí)間，隨著氣溫的回升和雨水的增多，田間雜草將迅速生長(zhǎng)，并形成危害。
 
　　二、麥田雜草防控技術(shù)意見(jiàn)
 
　　一要選準(zhǔn)防除時(shí)間。根據(jù)近期天氣特點(diǎn)、草齡及小麥生長(zhǎng)狀況等因素綜合分析，今年防除適期為2月中旬—3月上旬(小麥拔節(jié)前)，日平均氣溫穩(wěn)定在5℃以上，避開(kāi)寒流霜凍，選準(zhǔn)防除時(shí)間，迅速開(kāi)展防除工作。
 
　　二要科學(xué)選用除草劑。(1)以硬草、日本看麥娘、節(jié)節(jié)麥等禾本科雜草為主的田塊，可選用唑啉草酯、啶磺草胺、唑啉·炔草酯、氟唑·炔草酯等除草劑防除；對(duì)雜草密度較高，草齡偏大，可適當(dāng)增加用藥量。(2)以豬殃殃、播娘蒿、牛繁縷等闊葉雜草為主的田塊，可選用氯氟吡氧乙酸、2甲4氯、雙氟·氟氯酯、雙氟·唑草酮等除草劑防除。(3)禾本科雜草與闊葉雜草混生田塊，可選擇上述除草劑進(jìn)行兩次防除，即先防除一遍闊葉雜草，隔5天左右再防除一遍禾本科雜草，也可選擇上述兩類藥劑組合用藥。(4)注意事項(xiàng)：施藥時(shí)要避開(kāi)“倒春寒”天氣；苗齡偏大或低洼積水的小麥田謹(jǐn)慎用藥；前期遭遇低溫凍害嚴(yán)重的田塊，須等凍害恢復(fù)后開(kāi)展化除，避免加重凍藥害；禁止使用長(zhǎng)殘留期除草劑；炔草酯、唑啉草酯等與激素類除草劑混用易產(chǎn)生藥害，氯氟吡氧乙酸與苯醚甲環(huán)唑混用時(shí)易產(chǎn)生藥害。
 
　　三要加強(qiáng)技術(shù)服務(wù)指導(dǎo)。充分利用電視、廣播、報(bào)紙、網(wǎng)絡(luò)、微信、明白紙、農(nóng)信通等多種形式和途徑，加強(qiáng)技術(shù)指導(dǎo)，及時(shí)把雜草防除信息和技術(shù)送到千家萬(wàn)戶，讓農(nóng)戶充分認(rèn)識(shí)到雜草防除的重要性，熟練掌握雜草防除技術(shù)，增強(qiáng)防除雜草的自覺(jué)性和主動(dòng)性；要大力推廣自走式噴桿噴霧機(jī)等高效植保機(jī)械，用足藥量、兌足水量，噴勻噴透，防止漏噴降低效果，重噴引起藥害；科學(xué)管控好無(wú)人機(jī)施藥，防止漂移造成藥害。要根據(jù)田間實(shí)際情況，強(qiáng)化分類指導(dǎo)，對(duì)不同土壤墑情、苗情的農(nóng)戶分別提出指導(dǎo)意見(jiàn)。針對(duì)部分田塊播后未及時(shí)開(kāi)展冬前化除或防治效果不理想的田塊，要迅速組織開(kāi)展化學(xué)防除，減少雜草對(duì)小麥生產(chǎn)的危害。

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