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2024年冬小麥春季科學(xué)灌溉技術(shù)指導(dǎo)意見

2024-04-03 09:47:19 來源:全國農(nóng)業(yè)技術(shù)推廣服務(wù)中心 閱讀量:11732 評(píng)論

導(dǎo)讀:去年冬小麥播種后,大部分麥區(qū)降水偏多,當(dāng)前土壤墑情狀況較好,長江中下游部分地區(qū)、黃淮南部局地墑情過多,西北、西南部分麥區(qū)墑情不足,西南局地出現(xiàn)干旱至重旱。

  【農(nóng)機(jī)網(wǎng) 科技創(chuàng)新】 澆好春灌水、追好返青拔節(jié)肥,是促根壯蘗、培育健壯群體的關(guān)鍵措施。去年冬小麥播種后,大部分麥區(qū)降水偏多,當(dāng)前土壤墑情狀況較好,長江中下游部分地區(qū)、黃淮南部局地墑情過多,西北、西南部分麥區(qū)墑情不足,西南局地出現(xiàn)干旱至重旱。苗情整體好于常年同期。各地應(yīng)加強(qiáng)墑情監(jiān)測,因墑因苗指導(dǎo)小麥春灌工作,加強(qiáng)水肥管理,大力推廣淺埋滴灌、微噴灌、噴灌,配套水肥一體化,有條件的地區(qū),推廣智慧灌溉,促進(jìn)小麥單產(chǎn)提升,為今年夏糧豐收打下堅(jiān)實(shí)基礎(chǔ)。
 
  華北冬麥區(qū)
 
  (一)基本情況。本區(qū)域包括北京、天津、河北和魯西北。該區(qū)域去年小麥秋播時(shí)降水較少,氣溫偏高,多為造墑播種或澆凍水補(bǔ)墑,麥田底墑充足,播期拉長,出現(xiàn)少數(shù)早播旺苗和晚播弱苗“兩頭苗”現(xiàn)象。冬季有兩次大范圍的強(qiáng)降雨雪過程,有效補(bǔ)充土壤水分,目前麥田墑情整體適宜,一二類苗超過九成,個(gè)體健壯,群體充足,主體麥田帶綠越冬,苗情明顯好于去年和常年。
 
  (二)灌溉建議。本區(qū)域水資源普遍匱乏,地下水超采嚴(yán)重,應(yīng)立足土壤墑情和苗情,因墑因苗分類施策,控旺促弱穩(wěn)壯,促進(jìn)小麥高產(chǎn)穩(wěn)產(chǎn)。一類苗春一水宜推遲到拔節(jié)期,隨水追施尿素10—13公斤/畝;二類苗要促控結(jié)合,在返青后起身前澆第一水,隨水追施尿素、硝基肥等速效氮肥10—15公斤/畝;三類苗在墑情適宜的情況下要及早趁墑追肥,畝施速效氮肥6—8公斤,促弱轉(zhuǎn)壯。在返青后起身前澆第一水,拔節(jié)中后期澆第二水,隨水追施尿素、水溶肥等7—10公斤/畝;數(shù)干旱缺墑、苗弱、群體不足的麥田,要在日均氣溫穩(wěn)定在3℃以上時(shí)小水灌溉,畦灌每畝灌水不超過30m3。拔節(jié)后期灌第二水,結(jié)合灌水追施速效氮肥6—8公斤/畝。5月下旬至6月上旬可能出現(xiàn)“干熱風(fēng)”天氣,要做好“一噴三防”,有噴灌或微噴條件的麥田可提前噴水10m3/畝,降溫補(bǔ)水。
 
  (三)節(jié)灌措施。本區(qū)域主要為井灌區(qū),可采取以下節(jié)水灌溉措施:一是軟管輸水(小白龍)小畦灌,一般麥田畦寬5—7m,長7—9m,每次灌水量約50m3/畝。噴灌,采用移動(dòng)式、固定式、地埋式等噴灌設(shè)備,每次灌水量約30m3/畝。微噴灌,選擇噴幅為3—4m的微噴帶,或采用大型噴灌機(jī)進(jìn)行低壓微噴,每次灌水量15—25m3/畝。四是淺埋滴灌,每次灌水量約25m3/畝。微灌、噴灌可結(jié)合水溶肥、液體肥少量多次施用,提高水肥利用效率。
 
  黃淮麥區(qū)
 
  (一)基本情況。本區(qū)域包括河南、山東大部以及蘇皖兩省淮河以北。去年12月中旬及今年2月份出現(xiàn)大范圍降雪降溫,土壤墑情足,苗情狀況好。因去年11月份氣溫較往年偏高,部分麥田冬前長勢過旺。目前,黃淮海冬麥區(qū)大部分麥田土壤墑情較好,利于冬小麥返青拔節(jié),蘇皖兩省淮河以北部分地區(qū)墑情過多。
 
  (二)灌溉建議。本區(qū)域水資源相對充足,春灌宜立足墑情和苗情實(shí)際,分類施策,水肥結(jié)合,促進(jìn)高產(chǎn)。墑情不足至干旱的麥田,在返青后及時(shí)進(jìn)行春灌,結(jié)合灌水施用尿素10—15公斤/畝。墑情適宜的麥田:一、二類苗麥田拔節(jié)期—孕穗期土壤相對含水量低于65%時(shí)進(jìn)行灌溉,灌水時(shí)追施尿素15—18公斤/畝,構(gòu)建高效群體。3月下旬至4月上中旬若出現(xiàn)降雨,也可借雨追肥。三類苗麥田在返青后土壤相對含水量低于65%時(shí)灌水,隨水追施尿素8—10公斤/畝;拔節(jié)期再結(jié)合降水或灌溉追施尿素5—6公斤/畝、氯化鉀3公斤/畝。旺長麥田及時(shí)采取鎮(zhèn)壓、化控等技術(shù),水肥措施推遲至拔節(jié)期之后。墑情過多的麥田,應(yīng)及時(shí)清溝理渠、疏通田內(nèi)外溝系,保證排水通暢。黃淮灌漿期可能出現(xiàn)“干熱風(fēng)”,應(yīng)做好“一噴三防”,有噴灌條件的麥田也可提前噴水10m3/畝,補(bǔ)水降溫。
 
  (三)節(jié)灌措施。本區(qū)域既有渠灌區(qū),也有井灌區(qū),可采取以下節(jié)水灌溉措施:一是渠灌區(qū)采取小畦或窄畦灌溉。小畦灌溉每次灌水50—60m3/畝。窄畦畦長小于70m的田塊,可采用大流量澆“跑馬水”;窄畦畦長大于70m的地塊,可采用間歇波涌灌溉,每次灌水量約70m3/畝。二是井灌區(qū)軟管澆灌,用輸水軟管將井水引至田間進(jìn)行澆灌,每次灌水量40—50m3/畝。三是噴灌,包括大型噴灌機(jī)組和其他噴灌形式,每次灌水量30—40m3/畝;四是微灌(包括滴灌、微噴灌、微噴帶灌等),每次灌水量25—30m3/畝。五是特殊灌溉,主要通過噴灌或微灌進(jìn)行,可防氣象災(zāi)害,每次灌水量5—10m3/畝。
 
  西北麥區(qū)
 
  (一)基本情況。本區(qū)域包括山西、陜西、甘肅、寧夏、新疆冬小麥種植區(qū)。去年播種期土壤墑情足,苗情狀況好。受11月底低溫和越冬期寒潮天氣影響,西北東部部分麥田受凍。灌區(qū)部分麥田有旺長現(xiàn)象。目前大部分麥區(qū)土壤相對含水量為65%—78%,墑情適宜,寧夏中南部、甘肅東部部分旱區(qū)土壤相對含水量低于65%,墑情不足。
 
  (二)灌溉建議。本區(qū)域去冬今春雨雪較多,經(jīng)過凍融作用,目前各地麥田表土普遍膨松,容易加速失墑,建議各類麥田在返青至起身期地表(0—5cm)土壤相對含水量低于60%時(shí),及時(shí)鎮(zhèn)壓保墑。三類及早趁墑追肥,追施尿素3—4公斤/畝、磷酸二銨6—8公斤/畝,可趁雨追施或于麥行間溝施深埋。拔節(jié)期畝追施尿素約10公斤/畝、磷酸二銨5—8公斤/畝。水澆地平均氣溫穩(wěn)定在5℃以上時(shí)少灌輕追,噴(滴)灌10—15m3/畝,畝追施磷酸二銨約10公斤,土壤相對含水量低于65%時(shí)及時(shí)灌溉,地干能下地時(shí)及時(shí)劃鋤,提溫保墑。拔節(jié)期結(jié)合灌水畝追施尿素5—6公斤。二類起身期和拔節(jié)中后期土壤相對含水量低于60%時(shí)各灌水1次。起身期結(jié)合灌水每畝追施尿素8—10公斤、磷酸二銨9—10公斤。一類苗和稠旺苗,春季第一水推遲至拔節(jié)期灌溉,結(jié)合灌水追施尿素10—15公斤/畝。新疆冬麥區(qū)高效節(jié)水灌溉設(shè)施條件較好,應(yīng)大力推廣水肥一體化技術(shù)。一般于小麥返青期、起身拔節(jié)期、孕穗期各滴灌一次,小麥灌漿期間滴灌3次,每次灌水30m3/畝左右。結(jié)合灌水追肥,小麥拔節(jié)期追施尿素15—20公斤/畝,返青期和孕穗期追施尿素8—10公斤/畝,亦可搭配磷酸一銨、磷酸二氫鉀等肥料。
 
  (三)節(jié)溉措施。本區(qū)域主要為渠灌區(qū)和井灌區(qū),可采取以下節(jié)水灌溉措施:一是短(窄)畦灌溉,每次灌水量50—60m3/畝。二是軟管輸水(小白龍)畦灌,每次灌水量30—40m3/畝。三是噴灌、微灌,采用移動(dòng)式、固定式、地埋式等噴灌設(shè)備或微噴帶、滴灌帶等微灌設(shè)施,每次灌水量20—30m3/畝。
 
  長江中下游和西南麥區(qū)
 
  (一)基本情況。本區(qū)域主要包括湖北、江西、浙江、上海、四川、重慶、云南、貴州以及蘇皖兩省淮河以南、河南南部等麥區(qū)。目前大部分地區(qū)0—20cm土壤相對含水量75%—85%,墑情適宜,湖北大部、江西北部、江蘇和安徽大部、河南南部墑情過多,云南大部、川北和川南部分地區(qū)、重慶和貴州局地墑情不足,局地干旱至重旱。
 
  (二)灌溉建議。本區(qū)域水資源豐富,降水量相對豐沛。根據(jù)天氣預(yù)測,3—5月份長江中下游降水量較常年同期偏多,農(nóng)田漬澇災(zāi)害和階段性陰雨寡照天氣風(fēng)險(xiǎn)較高。西南四川南部、貴州西南、云南大部降水量較常年同期偏少2—5成,旱情將進(jìn)一步發(fā)展。長江中下游麥區(qū)局地墑情過多田塊,應(yīng)及時(shí)清理溝渠,疏通田內(nèi)外溝系,保證排水通暢。晚播稻茬麥田尤其要做好三溝配套,保證溝渠暢通,并結(jié)合中耕劃鋤散墑,降低漬害影響。三類苗要趁墑追施尿素等6—8公斤/畝,噴施大量元素水溶肥,促弱轉(zhuǎn)壯。揚(yáng)花灌漿時(shí)土壤相對含水量持續(xù)低于65%時(shí),灌水1次,灌水量不超過50m3/畝。如遇持續(xù)降雨、麥田出現(xiàn)漬澇,應(yīng)及時(shí)清溝排水、中耕散墑。抽穗期至成熟期,有噴灌條件的麥田在“干熱風(fēng)”天氣發(fā)生前可結(jié)合噴施磷酸二氫鉀噴水10m3/畝,以水調(diào)溫,補(bǔ)充養(yǎng)分。西南干旱麥區(qū)要積極調(diào)水引水抽水,開辟水源,確保澆足小麥揚(yáng)花灌漿水,結(jié)合“一噴三防”葉面噴施磷酸二氫鉀10m3/畝或含腐植酸水溶肥料,增強(qiáng)抗旱能力。
 
  (三)節(jié)灌措施。本區(qū)域主要為地表水灌區(qū),水源多為山塘、水庫、湖泊、江河等,小麥田塊多丘陵崗地,墑情不足時(shí)可采取軟管輸水(小白龍)+小畦灌溉,每次灌水量不超過50m3/畝。有條件的地區(qū)采用低壓微噴帶(管)、小型移動(dòng)式噴灌、固定和半固定式噴灌等,每畝灌水量20—30m3。
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