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山西省當前玉米田間管理技術要點
2024-08-01
08:34:13
來源:山西省農業農村廳 閱讀量:14057
評論
【農機網 熱點關注】 目前,我省春玉米大多處于灌漿期,夏玉米處于大喇叭口期。針對本年度氣候情況,提出以下四點后期管理措施。
一、旱情應對措施
1.對有灌溉條件的區域,要充分利用現有田間水利設施修復,采用滴灌、壟灌、微噴灌等節水灌溉措施,組織農戶統籌安排及時灌溉,灌溉時要注意避開大風等極端氣象,避免發生倒伏等現象。
2.對雨養旱作區域,建議地方農業、氣象部門積極溝通,采用燃放焰條和發射增雨火箭,人工增雨,緩解旱情。也還可采用噴施抗旱劑和葉面肥的方式,增強玉米抗旱能力。一但出現有效降雨,一定要抓住機會加強追肥、病蟲害防治等田間管理。
3.在高溫時期,要特別注意玉米的授粉情況,出現授粉不良時要及時采用無人機輔助授粉,提高結實率。
二、澇害應對措施
1.盡快排除積水,降低田間漬害程度。連續降雨田間積水過多,會導致土壤缺氧、阻礙根系呼吸代謝、吸收養分等活動,甚至導致爛根、爛葉、引發根腐病、莖腐病等病害,要及時排水,通過挖排水溝、抽水泵抽水等方式及時將田間的積水排走。
2.及時開展中耕松土。通過中耕還可將表層與底層土壤之間的毛細管水通道切斷,在表層土壤中形成疏松的覆蓋層,利于深層水分的快速散失,起到避免漬害發生的效果。
3.做好倒伏玉米植株的管理。玉米植株在大喇叭口期前發生漬害倒伏的和在拔節期后倒伏角度若小于45度的,不需人工扶正即可自行直立;在抽雄散粉階段后出現漬害、倒伏現象的,需進行人工扶正,并在莖基部適量培土,用腳踏實,經過2-3天即可有新的根系長出。
三、中后期病蟲害應對措施
8月份需注意病害流行擴散,建議農戶提前防控,盡早噴施殺螨劑、
殺蟲劑、殺菌劑,配合葉面肥等噴施實現一噴多防和一噴多促,并與植物生長調節劑蕓苔素內酯以及葉面肥磷酸二氫鉀等配合使用,達到防蟲治病,增產提質的目標。
1.降雨偏少地區。重點關注葉螨、雙斑螢葉甲等害蟲的發生發展動態,可用噻蟲胺、噻蟲嗪、氯蟲苯甲酰胺等殺蟲劑防治。
2.高溫高濕地區。重點關注大斑病和莖腐病的流行與發展,可選用枯草芽孢桿菌、井岡霉素A、苯醚甲環唑、吡唑醚菌酯、丙環·嘧菌酯等殺菌劑噴施。
四、其它管理措施
1.增加水肥投入。有滴灌條件的地塊應加大水肥投入,利用水肥一體化設備追施水溶肥或微生物菌肥,無灌溉條件的區域可采用無人機葉面噴施液態氮、生物鉀、微量元素和羥基蕓苔素組成的葉面肥套餐,防止后期脫肥早衰,有效調節玉米生理機能,增強玉米后期抗病性和持綠度。
2.適時晚收。加強培訓宣傳,建議農戶盡量晚收,在不存在莖腐病倒伏和葉片未枯死的前提下,春玉米可在早霜時間再進行收獲,充分利用光熱資源,延長灌漿時間和站桿脫水時間,以獲得更高產量。
3.機收減損。積極組織農機手,開展機收減損技術培訓,
收獲機維修保養調試。積極宣傳新技術新裝備,引導機具以舊換新,提高新裝備應用水平,進一步降低機收損失率。
來源|廳科教處
監審|馮耀斌
責編|馮曉君
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