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邗江麦油越冬期田管技术意见

2023-01-05 08:53:00 来源:江苏省扬州市邗江区农业农村局 阅读量:12068 评论

导读:当前麦油已进入越冬期,针对苗情特点和存在问题,围绕“促壮、防冻”目标,加强分类指导,因地因苗施策,控旺促壮转弱。

  【农机网 热点关注】一、冬前苗情分析
 
  据调查统计,2022年江苏省扬州市邗江区小麦种植面积10.1万亩,比上年增加约0.1万亩,其中适期播种面积1.5万亩,平均叶龄2.6叶,比上年少0.1叶;平均总茎蘖数25.2万/亩,比上年少2.5万。全区油菜种植面积1.32万亩,其中移栽油菜1.27万亩,直播油菜0.05万亩,平均叶龄分别为15.0叶和6.9叶,绿叶数分别为11.0张和4.5张。总体来说,今年我区冬前小麦苗情略差于上年,油菜苗情与上年基本持平。
 
  二、主要存在问题
 
  当前麦油苗情主要存在以下问题:一是苗情不平衡。适期播种与晚播小麦生育进程差距较大,11月5日之前播种的小麦长势较好,已经进入分蘖期,叶龄4-5叶;11月15日之前播种的小麦出苗情况好,基本实现一播全苗,叶龄3叶左右;11月底后迟播小麦受低温影响出苗缓慢,至12月19日约0.3万亩未出苗;部分早播小麦旺长、油菜提前抽薹,不利于壮苗越冬。二是草害潜在威胁较大。秋播以来温湿度适宜,利于杂草发生,已封闭田块效果较好,无明显杂草,但是由于降温提前,未封闭田块冬前难以开展化除,草害威胁大,春后化除压力大。
 
  三、越冬期田管技术
 
  当前麦油已进入越冬期,针对苗情特点和存在问题,围绕“促壮、防冻”目标,加强分类指导,因地因苗施策,控旺促壮转弱。越冬期间重点抓好以下几方面田管技术措施:
 
  一是早施苗肥,促弱转壮。当前田间墒情适宜,温度尚可,麦油仍然在缓慢生长,各地应结合苗情及时落实促苗措块施。对于苗小、苗弱的田快,于3叶期及早补施苗肥,亩施20斤尿素,利用越冬期有效积温,促进生长。对于适期播种、基本苗适中、群体适宜的田块,在3-5叶期增施壮蘖肥(平衡肥),一般亩施尿素10斤。对越冬前生长量小的油菜田,可在越冬后期早施蕾薹肥,促进春发生长;对大壮苗油菜要严控腊肥施用,减少无效生长,为春后抽薹期高效施肥创造条件。对少数旺长出现早薹的油菜田,可在2月中旬前,适时采摘主茎顶端菜薹,促分枝生长,并视情况少量补肥。
 
  二是适度镇压,防冻控旺。对于旺长和正常田块各地要利用冬闲季节进行适当镇压,遵循“干压湿不压,暖压冻不压” 的原则,适温适墒镇压,保墒防冻,旺长田适度重压、多次压。早播苗足的麦田和长势偏旺、叶色嫩绿的油菜田应及早进行化控,一般亩用15%多效唑40-60克对水喷施,控旺促壮,提高抗寒能力。
 
  三是清沟理墒,预防渍害。“麦田一套沟,从种喊到收”,今年秋冬降雨明显增多,有些麦田沟系尚不完全配套,广大种植户要利用冬闲季,及早开好内外三沟,清沟理墒,疏通竣深,确保内外三沟排水通畅,提高排涝降渍能力,防止冬春连续雨雪天气造成的渍害发生。
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