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山東省2019年夏玉米后期管理技術意見
2019-08-30
08:51:28
來源:山東省農業農村廳 閱讀量:21194
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【農機網 通知公告】 各市農業農村局:
近期,省農業農村廳組織省農業專家顧問團玉米分團、省現代農業產業體系玉米創新團隊和廳有關單位的專家,對全省玉米生產情況進行了分組考察和指導,并召開了全省玉米生產形勢專家會商會議,分析了當前玉米生產形勢,研究制定了《2019年全省夏玉米后期管理技術意見》,現印發給你們,請根據專家們提出的技術意見,因地制宜采取具體措施,搞好技術指導,強化后期管理,有針對性地做好應對突發情況的預案,努力奪取玉米豐產豐收。
山東省農業農村廳
2019年8月26日
2019年全省夏玉米后期管理技術意見
今年上半年我省降水偏少,玉米播種期較常年略有推遲,部分地區因干旱影響播種或出苗,造成田間整齊度不高。七月底以來,全省降水總體偏多,尤其是8月中旬受強臺風“利奇馬”影響,全省平均降水超過160毫米,部分農田出現內澇,嚴重影響到了玉米生產。目前我省夏玉米進入開花授粉期或灌漿初期,是決定粒數和粒重的關鍵時期。此階段田間管理的中心任務是:提高授粉質量,保證粒數,確保光合面積和時間,防止早衰,增加粒重,以提高單產彌補因災減產。主要措施是:防倒、保葉、補肥、增粒重、防病蟲、適期收獲。
一是疏通溝渠,提高抗旱防澇能力。各地要提前做好防災減災預案,密切關注天氣變化,充分做好準備,采取及早發動群眾、疏通斷頭溝、開挖排水渠、組織好機械和排水設備等多種措施,做到發生內澇時盡快排凈田間積水。同時防范干旱天氣,遇旱澆水,保障玉米粒期正常水分供應。
二是追施粒肥,確保后期養分供應。當前我省玉米大多處于灌漿初期,部分地塊處于抽雄吐絲期,此期對養分尤其是氮肥需求量較大。前期全省普遍強降雨,土壤養分淋失,容易脫肥,應增施氮肥,以尿素為主畝施10~15公斤,提高葉片光合效率、延長葉片功能期。也可葉面噴施磷酸二氫鉀和尿素,增加光合產物轉化,提高粒重。高產攻關田酌情增加氮肥用量。
三是分類施策,改善通風透光條件。今年干旱造成播期延長,田間玉米長勢差異較大,尤其是臺風過后,部分地塊出現倒伏,影響通風透光,應根據情況采取相應措施。完成授粉后穗上折斷的玉米,要及時割除折斷部分;倒伏嚴重、穗下莖折嚴重、發育過遲的地塊,無法形成產量,應提早收獲作為青貯飼料。
四是綜合防治,減輕病蟲為害損失。強降雨過后玉米田間濕度大、溫度高,易于病蟲害的發生和傳播,要密切關注病蟲害發生發展趨勢,強化監測預警,抓好統防統治。玉米尚處于抽雄吐絲期的地區,要抓緊實施“一防雙減”,混配殺菌、
殺蟲劑,利用大型施藥器械和飛防進行規模化防治,一次施藥兼治多種病蟲害,減少玉米后期穗蟲發生基數、減輕病害流行程度。
五是挖掘潛力,適期收獲提高粒重。目前大多數品種生育期偏長,在收獲時不能完全成熟。適期收獲可以延長灌漿時間,有利于干物質積累,充分發揮品種的高產潛力,增加粒重,提高產量。尤其是在前期干旱影響玉米發育的情況下,要繼續做好玉米適期收獲技術的培訓和宣傳,盡可能提高玉米成熟度,增加粒重保證產量。建議一般地塊在9月底10月初收獲,高產地塊在10月10日前后收獲。
六是科學引導,提高秸稈利用質量。要積極宣傳,引導推動秸稈綜合利用。秸稈還田的地塊,要加強對機手的培訓,確保秸稈切碎拋勻,深翻時應添加尿素和腐熟劑,加快秸稈的分解;有條件的地區可以開展玉米黃貯和生物質能綜合利用試驗。
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