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河北省關于印發《河北省2019年冬前小麥苗情分析及冬春季管理技術建議》的通知
2019-12-12
08:40:12
來源:河北省農業農村廳辦公室 閱讀量:22050
評論
【農機網 通知公告】 各市(含定州、辛集市)農業農村局,雄安新區管委會公共服務局,廳有關處室、直屬事業單位:
現將《河北省2019年冬前小麥苗情分析及冬春季管理技術建議》印發給你們,請結合當地實際,針對可能發生的秋冬連旱,及時制定抗旱預案,突出抓好節水品種和優質強筋品種先進適用技術指導,推進小麥綠色高質高效生產。
河北省農業農村廳辦公室
2019年12月6日
河北省2019年冬前小麥苗情分析及冬春季管理技術建議
為做好小麥冬春季田間管理,省小麥專家顧問組和省現代農業產業技術體系小麥產業創新團隊專家,在前期分區域考察的基礎上,于11月28日至30日對保定市定興縣和徐水區、滄州市獻縣和肅寧縣、衡水市景縣、邢臺市南和縣、邯鄲市臨漳縣和成安縣、石家莊市藁城區的小麥苗情進行了考察。在認真分析小麥苗情基礎上,提出了冬春麥田管理技術建議。
一、冬前小麥苗情特點
(一)品種布局合理,主導品種突出
今年秋季,全省小麥節水品種推廣面積536萬畝,近6年累計推廣面積達3272萬畝;優質強筋麥面積達到405萬畝,同比增加45萬畝。麥田秸稈還田和播后鎮壓面積所占比例均達到85%以上,較往年有所提高。
(二)播種技術落實到位,整體播種質量好
盡管今年玉米收獲晚于常年3-5天,小麥播期有所推遲,適期播種面積略有減少,但播種技術落實到位,整體播種質量好。據調查統計,全省小麥適期播種面積占72%,10月18日以后播種面積占28%,比去年增加6個百分點。
(三)出苗均勻整齊,基本苗充足
由于加強了對統一供應麥種的檢測檢驗,今年種子籽粒飽滿、發芽勢強、發芽率高,出苗整齊,缺苗斷壟現象有所減少。據調查,全省適期播種麥田畝播量13-16公斤,平均畝基本苗約28萬,比去年增加1.5萬,晚播麥田畝播量約17.5公斤,畝基本苗約33萬,比去年增加1.1萬。
(四)群體足個體壯,苗情總體好于常年
與上年相比,一、二類苗比例增加,三類苗比例下降。據農情調度調查,一類苗面積占53%;二類苗面積占41%;三類苗僅占6%。一類和二類苗比例分別比上年提高1個百分點。全省主體麥田畝總莖數70萬-80萬,群體較為適宜,小麥主莖葉齡為4葉1心至5葉1心,單株莖數3-4個,次生根3-5條,3葉大蘗和次生根數量均顯著高于常年。
二、當前存在的主要問題
(一)趁墑播種占比較大,部分地塊出現旱象
今年全省趁墑播種面積約占50%,10月11日到11月30日,麥區降水3-18毫米,較常年偏少4-8成。趁墑播種且冬前階段一直未進行灌溉的麥田土壤墑情明顯不足,部分地塊小麥出現第一個分蘗空位現象,若不及時進行冬前灌溉,遭受干旱災害的可能性加大。
(二)部分麥區播量偏大,個別麥田群體偏多
受近幾年小麥干旱和凍害等因素影響,近年來在部分地方普遍存在播量偏大的趨勢。今年部分地塊基本苗偏多,加之播后氣溫偏高,導致麥苗細弱,少部分播種早的麥田群體在100萬以上,呈現旺長趨勢,增加了受凍害的機率。
(三)部分麥田土壤塇松、容易失墑,有越冬凍害風險
個別麥田播后未及時進行鎮壓,造成土壤較塇松,跑墑透氣,小麥抗旱、抗寒性能減弱,不利于小麥安全越冬。據氣象部門預報,局部麥區有出現低溫天氣的可能,增加此類麥田發生越冬凍害的風險。
(四)小麥根部病害發生普遍,冬前化學除草面積小,增加了春季雜草防控難度
受干旱因素的影響,今年麥田雜草相對較少,但晚播麥田未能進行“雜草秋治”,增加了春天除草的難度,特別增加了對禾本科麥田雜草的除治的難度。
三、冬前及春季期管理意見
針對我省小麥苗情特點,當前小麥和春季管理應因地因苗制宜,當前管理突出“防凍害、保越冬”,春季應突出“防控土傳病害、強化鎮壓鋤劃,科學施用肥水”。在具體工作推動上,各地應重點抓好以下措施:
一是搶時澆好凍水。北部麥區和中南部墑情較差麥田、保墑能力差的麥田、旺長麥田要在土壤夜凍晝消時選擇白天搶時澆好封凍水,確保小麥安全越冬,土壤封凍后禁止澆水,以防產生冰層導致小麥窒息死亡
二是實施麥田鎮壓。針對冬前塇松麥田,在表墑適宜、土壤封凍前選擇晴好天氣下午進行鎮壓,踏實土壤,保溫保墑,防止凍害。針對冬前未鎮壓或土壤裂縫較多的麥田,在早春應及時進行鎮壓,以破碎坷垃、彌合裂縫、提墑保溫,促進小麥返青生長。
三是抓好春季節水。只要不是麥田嚴重缺墑,不要澆返青水或過早澆水,要盡可能推遲春季第一次澆水時間,推遲到小麥起身后期至拔節期。根據降雨和土壤墑情,有選擇的澆灌春季第二次水。大力推廣水肥一體化節水技術。
四是預防“倒春寒”。密切關注春季天氣變化,在強冷空氣到來之前及時灌水,調節麥田小氣候,同時噴施抗寒調節劑等。一旦發生凍害,要及時追施*化肥,促進受凍小麥盡快恢復生長。
五是防控病蟲草害。針對莖基腐病、根腐病、吸漿蟲等病蟲害可能偏重發生,以及草地貪夜蛾的潛在危害,應做好預測預報,提前制訂防控預案,及早準備藥劑、藥械,大力推行統防統治和綠色高效綜合防治技術。春季麥田化學除治禾本科雜草一定注意防治時期,好在小麥返青期6葉以前,且氣溫穩定在8℃以上時進行,小麥起身以后不能噴施
除草劑,嚴格控制除草劑用量,不與其他
殺蟲劑、
殺菌劑混用。對于優質麥田一定注意除草劑藥害的風險,小面積試驗后無藥害再使用。
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