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2024年冬小麦春季科学灌溉技术指导意见

2024-04-03 09:47:19 来源:全国农业技术推广服务中心 阅读量:11489 评论

导读:去年冬小麦播种后,大部分麦区降水偏多,当前土壤墒情状况较好,长江中下游部分地区、黄淮南部局地墒情过多,西北、西南部分麦区墒情不足,西南局地出现干旱至重旱。

  【农机网 科技创新】 浇好春灌水、追好返青拔节肥,是促根壮蘖、培育健壮群体的关键措施。去年冬小麦播种后,大部分麦区降水偏多,当前土壤墒情状况较好,长江中下游部分地区、黄淮南部局地墒情过多,西北、西南部分麦区墒情不足,西南局地出现干旱至重旱。苗情整体好于常年同期。各地应加强墒情监测,因墒因苗指导小麦春灌工作,加强水肥管理,大力推广浅埋滴灌、微喷灌、喷灌,配套水肥一体化,有条件的地区,推广智慧灌溉,促进小麦单产提升,为今年夏粮丰收打下坚实基础。
 
  华北冬麦区
 
  (一)基本情况。本区域包括北京、天津、河北和鲁西北。该区域去年小麦秋播时降水较少,气温偏高,多为造墒播种或浇冻水补墒,麦田底墒充足,播期拉长,出现少数早播旺苗和晚播弱苗“两头苗”现象。冬季有两次大范围的强降雨雪过程,有效补充土壤水分,目前麦田墒情整体适宜,一二类苗超过九成,个体健壮,群体充足,主体麦田带绿越冬,苗情明显好于去年和常年。
 
  (二)灌溉建议。本区域水资源普遍匮乏,地下水超采严重,应立足土壤墒情和苗情,因墒因苗分类施策,控旺促弱稳壮,促进小麦高产稳产。一类苗春一水宜推迟到拔节期,随水追施尿素10—13公斤/亩;二类苗要促控结合,在返青后起身前浇第一水,随水追施尿素、硝基肥等速效氮肥10—15公斤/亩;三类苗在墒情适宜的情况下要及早趁墒追肥,亩施速效氮肥6—8公斤,促弱转壮。在返青后起身前浇第一水,拔节中后期浇第二水,随水追施尿素、水溶肥等7—10公斤/亩;数干旱缺墒、苗弱、群体不足的麦田,要在日均气温稳定在3℃以上时小水灌溉,畦灌每亩灌水不超过30m3。拔节后期灌第二水,结合灌水追施速效氮肥6—8公斤/亩。5月下旬至6月上旬可能出现“干热风”天气,要做好“一喷三防”,有喷灌或微喷条件的麦田可提前喷水10m3/亩,降温补水。
 
  (三)节灌措施。本区域主要为井灌区,可采取以下节水灌溉措施:一是软管输水(小白龙)小畦灌,一般麦田畦宽5—7m,长7—9m,每次灌水量约50m3/亩。喷灌,采用移动式、固定式、地埋式等喷灌设备,每次灌水量约30m3/亩。微喷灌,选择喷幅为3—4m的微喷带,或采用大型喷灌机进行低压微喷,每次灌水量15—25m3/亩。四是浅埋滴灌,每次灌水量约25m3/亩。微灌、喷灌可结合水溶肥、液体肥少量多次施用,提高水肥利用效率。
 
  黄淮麦区
 
  (一)基本情况。本区域包括河南、山东大部以及苏皖两省淮河以北。去年12月中旬及今年2月份出现大范围降雪降温,土壤墒情足,苗情状况好。因去年11月份气温较往年偏高,部分麦田冬前长势过旺。目前,黄淮海冬麦区大部分麦田土壤墒情较好,利于冬小麦返青拔节,苏皖两省淮河以北部分地区墒情过多。
 
  (二)灌溉建议。本区域水资源相对充足,春灌宜立足墒情和苗情实际,分类施策,水肥结合,促进高产。墒情不足至干旱的麦田,在返青后及时进行春灌,结合灌水施用尿素10—15公斤/亩。墒情适宜的麦田:一、二类苗麦田拔节期—孕穗期土壤相对含水量低于65%时进行灌溉,灌水时追施尿素15—18公斤/亩,构建高效群体。3月下旬至4月上中旬若出现降雨,也可借雨追肥。三类苗麦田在返青后土壤相对含水量低于65%时灌水,随水追施尿素8—10公斤/亩;拔节期再结合降水或灌溉追施尿素5—6公斤/亩、氯化钾3公斤/亩。旺长麦田及时采取镇压、化控等技术,水肥措施推迟至拔节期之后。墒情过多的麦田,应及时清沟理渠、疏通田内外沟系,保证排水通畅。黄淮灌浆期可能出现“干热风”,应做好“一喷三防”,有喷灌条件的麦田也可提前喷水10m3/亩,补水降温。
 
  (三)节灌措施。本区域既有渠灌区,也有井灌区,可采取以下节水灌溉措施:一是渠灌区采取小畦或窄畦灌溉。小畦灌溉每次灌水50—60m3/亩。窄畦畦长小于70m的田块,可采用大流量浇“跑马水”;窄畦畦长大于70m的地块,可采用间歇波涌灌溉,每次灌水量约70m3/亩。二是井灌区软管浇灌,用输水软管将井水引至田间进行浇灌,每次灌水量40—50m3/亩。三是喷灌,包括大型喷灌机组和其他喷灌形式,每次灌水量30—40m3/亩;四是微灌(包括滴灌、微喷灌、微喷带灌等),每次灌水量25—30m3/亩。五是特殊灌溉,主要通过喷灌或微灌进行,可防气象灾害,每次灌水量5—10m3/亩。
 
  西北麦区
 
  (一)基本情况。本区域包括山西、陕西、甘肃、宁夏、新疆冬小麦种植区。去年播种期土壤墒情足,苗情状况好。受11月底低温和越冬期寒潮天气影响,西北东部部分麦田受冻。灌区部分麦田有旺长现象。目前大部分麦区土壤相对含水量为65%—78%,墒情适宜,宁夏中南部、甘肃东部部分旱区土壤相对含水量低于65%,墒情不足。
 
  (二)灌溉建议。本区域去冬今春雨雪较多,经过冻融作用,目前各地麦田表土普遍膨松,容易加速失墒,建议各类麦田在返青至起身期地表(0—5cm)土壤相对含水量低于60%时,及时镇压保墒。三类及早趁墒追肥,追施尿素3—4公斤/亩、磷酸二铵6—8公斤/亩,可趁雨追施或于麦行间沟施深埋。拔节期亩追施尿素约10公斤/亩、磷酸二铵5—8公斤/亩。水浇地平均气温稳定在5℃以上时少灌轻追,喷(滴)灌10—15m3/亩,亩追施磷酸二铵约10公斤,土壤相对含水量低于65%时及时灌溉,地干能下地时及时划锄,提温保墒。拔节期结合灌水亩追施尿素5—6公斤。二类起身期和拔节中后期土壤相对含水量低于60%时各灌水1次。起身期结合灌水每亩追施尿素8—10公斤、磷酸二铵9—10公斤。一类苗和稠旺苗,春季第一水推迟至拔节期灌溉,结合灌水追施尿素10—15公斤/亩。新疆冬麦区高效节水灌溉设施条件较好,应大力推广水肥一体化技术。一般于小麦返青期、起身拔节期、孕穗期各滴灌一次,小麦灌浆期间滴灌3次,每次灌水30m3/亩左右。结合灌水追肥,小麦拔节期追施尿素15—20公斤/亩,返青期和孕穗期追施尿素8—10公斤/亩,亦可搭配磷酸一铵、磷酸二氢钾等肥料。
 
  (三)节溉措施。本区域主要为渠灌区和井灌区,可采取以下节水灌溉措施:一是短(窄)畦灌溉,每次灌水量50—60m3/亩。二是软管输水(小白龙)畦灌,每次灌水量30—40m3/亩。三是喷灌、微灌,采用移动式、固定式、地埋式等喷灌设备或微喷带、滴灌带等微灌设施,每次灌水量20—30m3/亩。
 
  长江中下游和西南麦区
 
  (一)基本情况。本区域主要包括湖北、江西、浙江、上海、四川、重庆、云南、贵州以及苏皖两省淮河以南、河南南部等麦区。目前大部分地区0—20cm土壤相对含水量75%—85%,墒情适宜,湖北大部、江西北部、江苏和安徽大部、河南南部墒情过多,云南大部、川北和川南部分地区、重庆和贵州局地墒情不足,局地干旱至重旱。
 
  (二)灌溉建议。本区域水资源丰富,降水量相对丰沛。根据天气预测,3—5月份长江中下游降水量较常年同期偏多,农田渍涝灾害和阶段性阴雨寡照天气风险较高。西南四川南部、贵州西南、云南大部降水量较常年同期偏少2—5成,旱情将进一步发展。长江中下游麦区局地墒情过多田块,应及时清理沟渠,疏通田内外沟系,保证排水通畅。晚播稻茬麦田尤其要做好三沟配套,保证沟渠畅通,并结合中耕划锄散墒,降低渍害影响。三类苗要趁墒追施尿素等6—8公斤/亩,喷施大量元素水溶肥,促弱转壮。扬花灌浆时土壤相对含水量持续低于65%时,灌水1次,灌水量不超过50m3/亩。如遇持续降雨、麦田出现渍涝,应及时清沟排水、中耕散墒。抽穗期至成熟期,有喷灌条件的麦田在“干热风”天气发生前可结合喷施磷酸二氢钾喷水10m3/亩,以水调温,补充养分。西南干旱麦区要积极调水引水抽水,开辟水源,确保浇足小麦扬花灌浆水,结合“一喷三防”叶面喷施磷酸二氢钾10m3/亩或含腐植酸水溶肥料,增强抗旱能力。
 
  (三)节灌措施。本区域主要为地表水灌区,水源多为山塘、水库、湖泊、江河等,小麦田块多丘陵岗地,墒情不足时可采取软管输水(小白龙)+小畦灌溉,每次灌水量不超过50m3/亩。有条件的地区采用低压微喷带(管)、小型移动式喷灌、固定和半固定式喷灌等,每亩灌水量20—30m3。
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