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臺風“利奇馬”對玉米生產影響及災后恢復技術指導意見

2019-08-14 08:38:42 來源:農業農村部新聞辦公室 閱讀量:16590 評論

  【農機網 熱點關注】 今年第9號臺風“利奇馬”自8月10日在浙江登陸以來,給華東5省(市)及東北部分地區的玉米生產帶來不利影響。部分地區玉米地塊受淹,造成不同程度倒伏或莖折斷,影響玉米前期生長發育或中后期授粉灌漿,莖基腐病、葉斑病等病害加速侵染,增加了防控難度。當前,黃淮海夏播玉米大部分已結束授粉進入灌漿期,東北春玉米正處于灌漿期,是產量形成的關鍵期。針對臺風對玉米生產造成的不利影響,農業農村部玉米專家指導組會同全國農業技術推廣服務中心提出災后生產恢復技術指導意見。
 
  一是加強分類管理。根據臺風過后玉米倒伏情況,分類開展田間管理。倒伏較輕的玉米(莖與地面夾角大于45度),讓其自然直立起來;倒伏較重的玉米,特別是匍匐的玉米,及時扶正,在根部培土7—8厘米并踏實。孕穗期前倒伏的玉米,不宜動扶,否則容易傷根,影響產量。抽穗后倒伏的玉米,不剪葉、去頭,宜扶起扎把,以3—4棵為宜,倒伏當天扎把好。莖稈折斷嚴重的地塊,應盡快將折斷植株從田間清除,以免腐爛后影響正常植株生長,同時因地制宜補種生育期較短的其他作物。
 
  二是及時排水追肥。有積水的玉米田塊應盡快排水,降低田間濕度,并及時追肥。特別是浙江、江蘇部分地區還處于生育前期的玉米,強降水和洪澇過后,土壤肥力易被雨水帶走,可趁雨后放晴及時追施尿素和磷酸二氫鉀,連續噴灑2次,每次間隔7天,促進植株恢復生長。水淹特別嚴重的地塊,及時改種短季作物減少損失。
 
  三是強化病害防治。玉米倒伏后會造成機械損傷,易受莖基腐病、紋枯病、大斑病等病害侵染。莖基腐病可用25%葉枯靈或葉枯凈可濕性粉劑,加25%瑞毒霉可濕性粉劑或5%瑞毒霉錳鋅可濕性粉劑600倍液或50%多菌靈可濕性粉劑500倍液葉面噴施。紋枯病用5%井崗霉素,或25%粉銹寧可濕性粉劑,或24%噻呋酰胺懸浮劑,或25%戊唑醇可濕性粉劑,或20%紋枯凈可濕性粉劑,對準發病部位均勻噴霧。大斑病每畝施用30%吡唑醚菌酯·戊唑醇懸浮劑40毫升,或32.5%吡唑醚菌酯·戊唑醇懸浮劑20毫升,或65%代森錳鋅可濕性粉劑500倍液,或70%甲基托布津可濕性粉劑500倍液,或75%百菌清可濕性粉劑800倍液噴施,注意輪換用藥。
 
  (農業農村部玉米專家指導組 全國農業技術推廣服務中心)
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