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水稻應對臺風影響及災后恢復生產技術意見

2024-07-30 08:34:51 來源:全國農技中心 閱讀量:16467 評論

  【農機網 熱點關注】 當前,東北地區一季稻陸續進入孕穗至抽穗期,長江下游和華南地區一季稻處于分蘗盛期至拔節孕穗期,雙季晚稻處于移栽至分蘗初期,是水稻產量形成或構建健康群體的關鍵時期。據中央氣象臺預報,8月將有3—4個臺風生成,并有1—2個可能登陸我國。針對臺風對水稻生產可能造成的不利影響和潛在風險,農業農村部水稻專家指導組會同全國農業技術推廣服務中心,指導各地以“排澇降漬、水肥調控、病蟲防治”為重點,做好水稻應對臺風影響及災后恢復生產。
 
  排澇降漬促恢復
 
  加大機具和人力投入,提前清理疏通溝渠,挖好積水坑,做好排水準備。臺風過后,對受淹稻田,應快速排除田間積水,減輕漬澇對水稻生長的影響,特別要注意晚稻秧苗積水,防止長時間積水導致莖葉腐化和爛根,提高植株根系活力。災后如遇高溫晴熱天氣,切忌一次性排干田間水分,要分次排水,田間保留3厘米左右水層,防止高強度葉面蒸發導致植株生理失水。部分雙季晚稻沖毀的田塊,應改種雜豆、早熟鮮玉米等作物,減輕損失。
 
  根外追肥促生長
 
  加強水肥管理,退水后3—5天追肥。對東北地區部分種植晚熟品種的地塊,適時葉面噴施磷酸二氫鉀和植物生長調節劑等,提高水稻光合作用和灌漿速率,提高結實率和千粒重,促進安全成熟,降低早霜風險。對長江下游、華南地區災后生長偏弱的一季稻田塊,采取根施和葉面噴施相結合,適量追施速效氮肥,或采用磷酸二氫鉀加少量尿素均勻噴霧;對處于分蘗至拔節期的雙季晚稻每畝補施尿素3—5公斤,提高植株抗病力,加快恢復生長。
 
  嚴控病蟲減損失
 
  水稻受澇后導致葉片損傷,增加感病感蟲風險,臺風過后要及時用藥全面防治1—2次。東北地區,稻瘟病、紋枯病、稻曲病堅持預防為主,拔節孕穗期已防治的田塊,抽穗揚花期前后進行第2次噴藥預防。長江下游和華南地區,一季稻重點在破口前7—10天及抽穗期,抓好稻瘟病、稻曲病及稻縱卷葉螟、二化螟、稻飛虱等病蟲防治;雙季晚稻加強拔節期及孕穗期的白葉枯病、稻瘟病、紋枯病及稻縱卷葉螟、稻飛虱的防治。
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