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2024年夏季茶園防災減災技術指導意見

2024-07-05 11:33:14 來源:全國農業技術推廣服務中心 閱讀量:12188 評論

  【農機網 熱點關注】 根據氣象部門預測,受赤道中東太平洋由厄爾尼諾向拉尼娜轉換影響,今年夏季我國氣候狀況總體偏差,中東部大部降水總體偏多,區域性和階段性洪澇災害明顯,極端天氣氣候事件偏多,局地發生極端性強降水和階段性高溫的可能性較大。為指導茶園做好極端災害性天氣防范應對,農業農村部種植業管理司會同全國農業技術推廣服務中心、農業農村部茶葉專家指導組、國家茶葉產業技術體系,提出2024年夏季茶園防災減災技術指導意見。
 
防范應對洪澇災害
 
  (一)提前落實防范措施
 
  密切關注天氣預報。暴雨前檢查疏通茶園排灌溝渠,確保排水正常。缺少排水溝渠的茶園,應在園內及四周搶挖排水溝,如茶園位于低洼地或地下水位過高,需開挖1米以上深溝。適采茶園應組織搶采搶制,減輕災害損失。
 
  (二)及時開展受澇茶園搶修補救
 
  1.盡快排除地表水。茶園遭受洪澇災害后盡快組織人力排除地表水。平地茶園要及時在茶園四周開挖圍溝,中間開挖中溝或廂溝排水,盡快將地下水位降至1米以下。抗澇能力弱的茶樹良種繁育基地和幼齡茶園,宜用水泵直接抽水。
 
  2.盡快修復基礎設施。抓緊修復受損茶園道路、溝渠、泵站等農業基礎設施。茶樹良種繁育基地要首先修復噴灌設施及泵站、受損棚室和遮陰設施。山地、丘陵茶園要抓緊整修道路、溝渠和梯坎,疏通溝渠,保證水、路暢通,防止次生災害發生。垮塌茶園地形地勢符合標準茶園建設要求的要迅速組織修復重建,盡快恢復園相。
 
  3.及時清理茶園。受洪水沖泡的茶園,要挖除堆積在茶樹上的泥土泥沙,盡快清除樹冠上的污泥雜物,保持樹冠清潔衛生。幼齡茶園要扶正倒伏樹體,培土覆蓋根系,保護茶苗直立成活。
 
  4.及時修剪。對于水淹時間過長、傷根嚴重、葉片出現明顯枯萎癥狀的茶樹,在表土干燥后,用修剪機進行重修剪或深修剪,以減少茶樹枝葉水分蒸發和養分消耗,防止整株死亡。對于露根、傷根茶樹,要及時培土,剪除拖地枝和斷枝等。其他受災茶園要及時修剪,培養豐產樹冠。
 
  5.及時補充養分。受災茶園要進行中耕除草、開溝施肥,溝深宜在15厘米左右,施肥后應及時覆土。肥料可選用腐熟有機肥和復合肥。投產茶園一般畝施500公斤有機肥和20—30公斤復合肥(可分2次施),1—3年生幼齡茶園一般畝施100公斤有機肥和10—20公斤復合肥(可分2次施)。
 
防范應對高溫干旱
 
  (一)切實落實抗旱措施
 
  1.加強旱害監測。易受旱地區茶園要注意監測旱害情況,提前落實防范措施。
 
  2.及時灌溉抗旱。丘陵山區茶園應利用有利地形修筑水溝、渠道、蓄水池和山塘等,擴大排、蓄水能力。夏秋旱季,當茶園耕層土壤相對含水率降到70%左右,或者日平均氣溫達28℃以上且有7—10天不下雨時,采用噴灌或溝灌等方式,及時灌溉補水。
 
  3.加強茶園遮陰。在茶園搭設遮陽網遮陰,減少光照強度,緩解干旱。遮陽網要高出茶樹50厘米以上,避免緊貼茶樹,造成燙傷。
 
  4.淺耕鋤草和鋪草覆蓋。旱季來臨前,對茶園進行淺耕鋤草,以減少地表蒸發。有條件的茶園,宜在茶園中進行鋪草覆蓋,降溫保墑。草料可選用山野草、農作物秸稈、蔗渣、木屑等,每畝用干草料1噸左右,鋪草厚度5—10厘米。
 
  5.補充茶園養分。對于土層淺、土質差的茶園,在雨季或雨季之前進行深耕,耕作深度應達20厘米以上,同時每畝施用有機肥1—2噸。
 
  (二)及時開展高溫干旱災后補救
 
  1.及時修剪。旱情過后要及時進行修剪,根據枝葉干枯程度,采取輕修剪、深修剪甚至臺刈的方式,剪除枯死的枝干,重新培養良好樹冠。
 
  2.適時補苗。幼齡茶樹由于根系淺,抗旱能力弱,容易因干旱而死亡。干旱過后,雨季到來之前,要及時補苗,避免出現缺株斷行的情況,影響成園后的產量。
 
  3.合理施肥。幼齡茶園在干旱季節可用0.5%磷酸二氫鉀水溶液進行根外追肥。投產茶園可追施復合肥或有機肥,一般可每畝追肥復合肥20—30公斤或有機肥500公斤以上。
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