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玉米應對臺風影響及災后恢復生產(chǎn)技術意見

2024-07-29 08:40:51 來源:全國農(nóng)技中心 閱讀量:18921 評論

導讀:針對臺風對玉米生產(chǎn)可能造成的不利影響和潛在風險,農(nóng)業(yè)農(nóng)村部玉米專家指導組會同全國農(nóng)業(yè)技術推廣服務中心,以“防汛降漬、追肥促長、分類扶正、防控病蟲”為重點,提出玉米應對臺風影響及災后恢復生產(chǎn)技術意見。

  【農(nóng)機網(wǎng) 熱點關注】 目前,我國黃淮海夏玉米多處于大喇叭口期前后、東北春玉米多處于抽雄吐絲期前后,是防倒伏、促授粉、保結(jié)實的關鍵時期。據(jù)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。針對臺風對玉米生產(chǎn)可能造成的不利影響和潛在風險,農(nóng)業(yè)農(nóng)村部玉米專家指導組會同全國農(nóng)業(yè)技術推廣服務中心,以“防汛降漬、追肥促長、分類扶正、防控病蟲”為重點,提出玉米應對臺風影響及災后恢復生產(chǎn)技術意見。
 
  疏通溝渠  防汛降漬
 
  在臺風、暴雨來臨前開好排水溝,梯次漸深配套,保持溝渠通暢。低洼地塊提前深挖溝渠、提高排水能力,備足水泵等裝備、隨時疏浚排水。雨后及時查田,積水地塊加快清淤除障、架設水泵強排,減少植株水淹時間。有條件的地塊可在雨后晴好天氣中耕作業(yè),破除板結(jié)、疏松土壤,增強土壤透氣性。
 
  適時追肥  促進生長
 
  大喇叭口至抽雄吐絲期正是玉米養(yǎng)分需求高峰期,雨后養(yǎng)分容易流失,一般畝施用尿素10—15公斤,使用緩釋肥作底肥的追施尿素10公斤左右,強降雨影響較重地塊適當增加追肥量,盡快保證養(yǎng)分供應促進生長。適時開展一噴多促作業(yè),一次或多次噴施磷酸二氫鉀、蕓苔素內(nèi)酯等植物生長調(diào)節(jié)劑和葉面肥,并根據(jù)病蟲發(fā)生情況配施殺蟲殺菌劑,提高群體災后恢復生長能力。一般在上午10點前或下午4點后作業(yè),也可夜間作業(yè)。
 
  分類扶正  促進結(jié)實
 
  對雨后倒伏的玉米田,視情況分類扶正。尚未抽雄的地塊,對根倒、莖稈傾斜植株不需扶正,依靠植株自我調(diào)節(jié);對莖折植株盡量清理離田,增加群體通風透光。已經(jīng)抽雄授粉的地塊,對根倒、莖倒且莖稈與地面超過45度角的玉米植株一般不扶正,避免二次傷害;對倒伏平鋪的盡快扶正,可將相鄰4—6株綁在一起;對根系再次生長扎地的采取墊扶措施,使玉米果穗離開地面。莖折嚴重的受災地塊視情況改作青貯收獲,減少損失。對處在玉米散粉高峰期受暴雨影響的,可在雨后晴好天氣時開展無人機輔助授粉,飛行高度距冠層3米左右。
 
  防控病蟲  減少損失
 
  臺風過境后,密切監(jiān)測分析病蟲害發(fā)生情況。黃淮海地區(qū)重點關注南方銹病、褐斑病、棉鈴蟲、桃蛀螟、玉米螟等病蟲害,東北地區(qū)重點關注大斑病、灰斑病、北方炭疽病、玉米螟、黏蟲等病蟲害,做好統(tǒng)防統(tǒng)治。選用適當藥劑防治葉斑類病害和穗期病蟲害。
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