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立春后小麥機(jī)械化管理

2021-02-05 15:06:28 來源：淮安市農(nóng)機(jī)推廣站 閱讀量：23401 評論

導(dǎo)讀：小麥春季旺長需注意 小麥在春季旺長時，一是容易遭受凍害；二是招致倒伏；三是病蟲流行。無論是遭受凍害、招致倒伏，還是病蟲流行等，終都易造成小麥減產(chǎn)，給奪取夏糧豐收帶來嚴(yán)峻挑戰(zhàn)。

　　【農(nóng)機(jī)網(wǎng) 科技創(chuàng)新】 “立春一到，白晝長，太陽暖”，農(nóng)民朋友就要盤算全年的農(nóng)業(yè)生產(chǎn)大事了。土地逐漸化凍回暖，耙耢保墑就提上重要日程。"劃鋤耙壓冬小麥，保墑增溫分蘗添?？购惦p保不能忘，開動機(jī)器灌春天。"農(nóng)諺說："春脖短，早回暖，常常出現(xiàn)倒春寒。春脖長，回春晚，一般少有倒春寒。"對農(nóng)事來說，一要做好對大風(fēng)、寒潮以及干旱天氣的防災(zāi)工作；二要注意倒春寒的應(yīng)對。
 
　　小麥春季旺長需注意 小麥在春季旺長時，一是容易遭受凍害；二是招致倒伏；三是病蟲流行。無論是遭受凍害、招致倒伏，還是病蟲流行等，終都易造成小麥減產(chǎn)，給奪取夏糧豐收帶來嚴(yán)峻挑戰(zhàn)。
 
　　春季旺苗期如何才能奪取高產(chǎn)呢？要因苗制宜，分類管理，采取以控為主、促控結(jié)合的綜合措施，防凍防倒防災(zāi)害，促旺苗轉(zhuǎn)壯苗，搭建豐產(chǎn)苗架，實(shí)現(xiàn)小麥高產(chǎn)。
 
　　1.機(jī)械碾壓。在小麥返青期至起身期用鎮(zhèn)壓輥碾壓，控制地上部生長和過多分蘗的發(fā)生，促進(jìn)地下根系發(fā)育，抑制小麥生育進(jìn)程過快，避免其過早進(jìn)入拔節(jié)期。碾壓要做到"一適時"(在無霜天上午10時以后進(jìn)行)和"三不壓"(有霜凍麥田不壓、鹽堿澇洼麥田不壓、已拔節(jié)麥田不壓)。
 
　　2.化學(xué)控制。在小麥返青至起身期用無人植保飛機(jī)或高地隙植保機(jī)化學(xué)控旺，可抑制基部第一節(jié)間伸長，使節(jié)間短、粗、壯，具有控旺、促根、防倒、增產(chǎn)四重作用。
 
　　3.深中耕(耙或鋤)。旺麥大多為群體大、個體弱，地上旺、地下弱，通過深中耕可斷老根、發(fā)新根、深扎根，能控上促下，促旺苗轉(zhuǎn)壯苗。深中耕深度，一般應(yīng)達(dá)5～10厘米。適宜在小麥返青期至起身期進(jìn)行，而且是越早越好。沒有條件的應(yīng)及早摟麥，用耙子順麥行摟出枯葉，以便通風(fēng)透光。
 
　　4.因苗巧追肥澆水。 對已遭受凍害的旺麥和有脫肥干旱現(xiàn)象但群體不太大的麥田，可提早追肥澆水，在早春小麥返青期至起身前期追肥澆水，促假旺苗(弱苗)轉(zhuǎn)壯苗，爭取足夠的成穗。對有脫肥現(xiàn)象但群體偏大的麥田，應(yīng)適時在起身期追肥澆水，滿足小麥發(fā)育需水需肥。對沒有出現(xiàn)脫肥和受早現(xiàn)象的過旺麥田，春季要先適當(dāng)蹲苗半月至一個月，推遲追肥澆水，避免過多春季分蘗發(fā)生，一般應(yīng)在拔節(jié)期或拔節(jié)后期再追肥澆水。一般畝追肥量以尿素5～7.5公斤、畝水澆量以30～50方為宜，澆水后適時中耕保墑。
 
　　5.無人機(jī)或高地隙植保機(jī)防治病蟲草害。旺長麥田病蟲害一般偏早偏重發(fā)生，應(yīng)加強(qiáng)病蟲監(jiān)側(cè)，早發(fā)現(xiàn)，早防治，防止病蟲蔓延，積極抗災(zāi)減災(zāi)。今年蚜蟲、銹病菌等越冬基數(shù)大，應(yīng)在陽歷3月份小麥返青至起身期，結(jié)合化控和噴打除草劑，添加對癥農(nóng)藥，及早進(jìn)行綜合防治。
 
　　6.預(yù)防"倒春寒"。 注意收聽天氣預(yù)報(bào)，遇到降溫天氣，應(yīng)采取提前灌水防凍、大擺煙霧陣避凍、凍害發(fā)生后及早水肥齊攻等措施補(bǔ)救，將災(zāi)害造成的損失降到低程度。

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