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地點(diǎn): 西安市
開展時(shí)間: 2025-03-13
舉辦單位: 中國機(jī)械工業(yè)聯(lián)合會、中國通信工業(yè)協(xié)會
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地點(diǎn): 武漢市
開展時(shí)間: 2025-03-14
舉辦單位: 北京鼎成創(chuàng)贏國際展覽有限公司
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地點(diǎn): 成都市
開展時(shí)間: 2025-03-15
舉辦單位: 四川省農(nóng)機(jī)服務(wù)協(xié)會、四川省農(nóng)業(yè)機(jī)械學(xué)會、四川省農(nóng)業(yè)工程學(xué)會、四川省5G產(chǎn)業(yè)聯(lián)盟智慧農(nóng)業(yè)專委會、中國天
小麥控旺抗旱防凍保安全越冬技術(shù)指導(dǎo)意見
2025-01-31
09:44:33
來源:全國農(nóng)技推廣中心 閱讀量:12146
評論
【農(nóng)機(jī)網(wǎng) 科技創(chuàng)新】 “大寒”已至,冬小麥全面進(jìn)入越冬期。近期,全國氣溫持續(xù)偏高,部分地區(qū)小麥旺長趨勢進(jìn)一步加劇。氣象部門統(tǒng)計(jì),2024年11—12月,全國平均氣溫較常年偏高0.9℃,主產(chǎn)區(qū)小麥越冬期普遍推遲5—7天。氣象部門預(yù)測,未來一段時(shí)間,全國大部分地區(qū)氣溫偏高仍將持續(xù),局部地區(qū)日最高氣溫將比常年同期偏高10℃以上,加之主產(chǎn)區(qū)近期無有效降水降雪,部分麥區(qū)土壤墑情不足、旱情已有所抬頭,旱寒疊加風(fēng)險(xiǎn)持續(xù)加大。針對當(dāng)前氣象條件和生產(chǎn)實(shí)際,各地要緊盯農(nóng)時(shí)、緊扣環(huán)節(jié)、緊抓措施,圍繞控旺促弱、抗旱防凍、防控病蟲,立足冬季早抓早管、促進(jìn)苗情轉(zhuǎn)化,全力搭好豐收苗架。
控制旺長培育壯苗
部分播期偏早、播量偏大的旺長麥田,如遇冬季氣溫持續(xù)偏高,可能造成生育進(jìn)程提前,加大凍害風(fēng)險(xiǎn)。一要機(jī)械鎮(zhèn)壓。堅(jiān)持“壓干不壓濕、壓軟不壓硬、壓輕不壓重”原則,趁當(dāng)前土壤尚未封凍的有利時(shí)機(jī),因苗因地因墑開展機(jī)械鎮(zhèn)壓。對旺長趨勢明顯的麥田,及時(shí)組織機(jī)械重壓,控地上分蘗、促地下長根、保穩(wěn)健生長;對土壤過濕地塊,不宜進(jìn)行鎮(zhèn)壓;對晚播弱苗注意輕壓,避免出現(xiàn)機(jī)械損傷。二要及時(shí)化控。對群體偏大、有旺長趨勢麥田,可在日均溫8℃以上時(shí)葉面噴施生長調(diào)節(jié)劑,抑制地上部分生長,噴施要均勻適量,避免重復(fù)噴施。對群體偏大、葉片過長但個(gè)體瘦弱的“假旺苗”,或有缺肥癥狀的麥田,不宜化控,可噴施磷酸二氫鉀等生長調(diào)節(jié)劑,促根健苗、增強(qiáng)抗性。三要適時(shí)劃鋤。對苗齡過大、群體過旺的麥田,可采用中耕劃鋤,在小麥行間深鋤5—7厘米,切斷部分根系,控制養(yǎng)分吸收和地上部分生長,減少分蘗,培育壯苗。
肥水調(diào)控促弱穩(wěn)壯
根據(jù)土壤墑情和小麥苗情抓好肥水管理,培育壯苗、促弱轉(zhuǎn)壯、控旺保穩(wěn),確保小麥安全越冬。對土壤墑情較差、有旱象苗頭的麥田,要及時(shí)澆水適量施肥,促進(jìn)健壯生長。對墑情適宜、長勢正常的壯苗,當(dāng)前可不進(jìn)行肥水管理。對施肥不足、群體偏小、長勢較差的弱苗,要趁雨或趁墑追施速效氮肥,促進(jìn)苗情轉(zhuǎn)化。對秸稈還田量大、土壤懸空不實(shí)的麥田,要適時(shí)澆水、踏實(shí)土壤,促進(jìn)根系下扎,提高植株抗逆能力。對稻茬小麥,要重點(diǎn)做好內(nèi)外“三溝”配套,及時(shí)清溝理墑,確保溝系暢通,預(yù)防漬害發(fā)生,也有利于必要時(shí)溝灌洇水。
適時(shí)冬灌抗旱防凍
因時(shí)因地因苗抓好冬灌,既可改善土壤墑情、促進(jìn)生根分蘗,又可緩沖降溫影響、降低冬季凍害風(fēng)險(xiǎn)。要搶抓合適時(shí)期,避免因冬灌過早提前蒸發(fā)無法增墑防凍,或因冬灌過晚土壤凍結(jié)水分無法下滲,造成麥苗受凍或窒息死亡。對土壤相對含水量低于70%的麥田,應(yīng)在日均溫3℃左右夜凍晝消時(shí)澆越冬水;對冬前土壤墑情較好的旺苗麥田,可適當(dāng)推遲冬灌或不冬灌。冬灌應(yīng)采用“小白龍”、微灌、噴灌等灌溉措施,灌后及時(shí)劃鋤松土,一般畝澆水量不超過40立方米,切忌大水漫灌。對單根獨(dú)苗的晚播弱苗可不進(jìn)行冬灌,避免降低地溫,影響苗情轉(zhuǎn)化,但若出苗不足,可適量灌水促足苗。
壓低基數(shù)防治病蟲草害
加強(qiáng)系統(tǒng)監(jiān)測,適時(shí)開展藥劑防控和綠色防控,盡量壓低病蟲草害越冬基數(shù)。對于小麥病害,西北菌源區(qū)和西南冬繁區(qū)是條銹病防治重點(diǎn)地區(qū),要堅(jiān)持“帶藥偵查、發(fā)現(xiàn)一點(diǎn)、控制一片”,減少發(fā)病中心、控制發(fā)生蔓延;紋枯病病菌在溫濕度適宜環(huán)境下傳播速度快,務(wù)必及時(shí)防治,控制病菌蔓延。對于小麥蟲害,要密切監(jiān)測地下害蟲、麥蜘蛛、蚜蟲等發(fā)生動態(tài),一旦達(dá)到防治標(biāo)準(zhǔn),及時(shí)開展綜合防治。對于麥田雜草,要根據(jù)草相和氣溫變化,選擇對路藥劑,在均溫5℃以上、無霜凍降雨的晴好天氣開展化學(xué)除草,防止出現(xiàn)凍藥害。
來源:農(nóng)業(yè)農(nóng)村部小麥專家指導(dǎo)組、全國農(nóng)業(yè)技術(shù)推廣服務(wù)中心
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