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當前水稻抗洪澇促恢復生長技術意見

2024-07-12 09:23:24 來源：全國農技中心 閱讀量：14048 評論

　　【農機網 科技創新】 6月以來，東北地區持續低溫，南方嚴重洪澇，不利于水稻生產。當前一季稻大部處于分蘗拔節期，由于種植區域跨度大，苗情相對復雜，病蟲草害威脅大。據氣象預報，隨著副熱帶高壓北抬，江淮、江南將進入降雨間歇期，南方高溫迅速發展，東北部分地區氣溫快速回升。針對當前水稻生產形勢和氣象條件，提出以“加強水分管理、看苗補肥促苗、強化災害防控、補種改種減損”為核心的水稻抗洪澇促恢復生長技術意見。
 
　　加強水分管理
 
　　強降雨過后，要及時排水露田，促進水稻根系恢復生長活力，防止倒伏。一季稻移(拋)栽后，堅持薄水活棵、適時露田，促根系下扎、分蘗早發，分蘗盛期開始及時曬田、控制無效分蘗。返青難、分蘗慢的地塊，適當延后排水曬田控蘗時期。對于秸稈還田量大的田塊，要多次排水露田通氣，增加土壤含氧量，加快秸稈腐熟，促進根系發育，防止僵苗。
 
　　看苗補肥促苗
 
　　對移栽期遲、秧苗素質弱或僵苗田塊，通過肥水調控或噴施生長調節劑，促苗情轉化。活棵返青后，及早施用分蘗肥。對于基肥施用不足的田塊，在分蘗肥施用后1周可根據苗情補施平衡肥。再生稻可根據受災情況，比正常年份適當提早噴施促芽肥，在齊穗后10—15天施用，促進再生芽萌發。
 
　　強化災害防控
 
　　開展病蟲監測預警，推行專業化統防統治。大水浸泡過的稻田易發白葉枯和紋枯病，退水后應及時防治；高溫高濕條件易導致病蟲害加重發生，尤其是要加強稻縱卷葉螟、稻飛虱等監測，視情況及時防控。部分地區一季稻茬口提前，要注意防范7月下旬至8月上旬高溫熱害影響；抽穗時如遇持續超過35℃的高溫，田間要保持深水層，以水調溫，降低穗層溫度。
 
　　及時補種改種
 
　　抓好一栽就管工作，密切關注田間苗情，及早踏田查苗補缺，如大田斷壟或缺棵5%以上(高產田3%以上)時，條件允許的應在栽后一周內全田勻苗補缺，確保足量基本苗數。對于尚未移栽的稻田，尤其蝦稻田要適當增加栽插密度盡快栽插，為水稻高產奠定堅實基礎。若淹水時間較長葉片難以恢復光合作用，但中下部莖稈和腋芽成活較好，可及時刈割留10—15cm的低稻樁，并畝施尿素10—15公斤蓄留再生稻，減少田間損失；若淹水時間過長導致莖葉死亡、無法恢復生長，可改種秋玉米、紅苕、蔬菜等短生育期作物，盡量減少災害損失。
 
　　來源：農業農村部水稻專家指導組、全國農業技術推廣服務中心

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