"

hg158皇冠 - app注册登录拥有全球最顶尖的原生APP,每天为您提供千场精彩体育赛事,hg158皇冠 - app注册登录更有真人、彩票、电子老虎机、真人电子竞技游戏等多种娱乐方式选择,hg158皇冠 - app注册登录让您尽享娱乐、赛事投注等,且无后顾之忧!

<cite id="h3r5z"><video id="h3r5z"></video></cite>
<var id="h3r5z"><video id="h3r5z"></video></var><cite id="h3r5z"></cite>
<ins id="h3r5z"><span id="h3r5z"></span></ins>
<var id="h3r5z"><span id="h3r5z"><menuitem id="h3r5z"></menuitem></span></var>
<cite id="h3r5z"></cite>
<var id="h3r5z"><noframes id="h3r5z"><menuitem id="h3r5z"></menuitem><var id="h3r5z"></var>
<var id="h3r5z"><video id="h3r5z"><menuitem id="h3r5z"></menuitem></video></var><menuitem id="h3r5z"><strike id="h3r5z"><thead id="h3r5z"></thead></strike></menuitem><cite id="h3r5z"><span id="h3r5z"></span></cite>
<ins id="h3r5z"><span id="h3r5z"><var id="h3r5z"></var></span></ins>
<cite id="h3r5z"></cite>
<var id="h3r5z"></var>
<var id="h3r5z"><strike id="h3r5z"></strike></var>
<ins id="h3r5z"><video id="h3r5z"><var id="h3r5z"></var></video></ins>
<var id="h3r5z"></var><cite id="h3r5z"><span id="h3r5z"><var id="h3r5z"></var></span></cite>
<cite id="h3r5z"><span id="h3r5z"></span></cite>
<var id="h3r5z"></var>
<cite id="h3r5z"></cite>
<cite id="h3r5z"></cite><cite id="h3r5z"><strike id="h3r5z"><menuitem id="h3r5z"></menuitem></strike></cite><var id="h3r5z"><video id="h3r5z"></video></var>"

大豆荚而不实原因及防治方法有哪些?

发布时间:2018-06-11 19:54:03

  大豆种植过程中经常发生荚而不实的现象,这会大大影响大豆的产量。大豆荚而不实多发生于夏大豆,其原因很多,如氮磷钾比例不当、品种差异、密度过大、微量元素缺乏、病虫危害等等因素,都可致使籽粒鼓不起来,形成秕荚。大豆荚而不实原因及防治方法有哪些?

  大豆荚而不实原因及防治方法可从以下几方面着手:

  1.增施有机肥和磷钾肥。单-使用氮肥,易出现疯长现象,引起荚而不实。夏大豆出苗后-定要追施-定量的有机肥和三元复合肥。对秕荚发生严重的田块更应增施磷钾肥,减少秕荚。

  2.喷施叶面肥。大豆缺硼极易引起荚而不实。生产上应在大豆初花期后每隔10天喷洒-次0.1%-0.2%的硼砂、0.5%-1%的尿素溶液,连喷2-3次;盛花期喷施磷酸二氢钾0.2%-0.5%,不仅可预防植株脱肥,也可预防秕荚。叶面肥应在无风的阴天或晴天下午喷施,以喷洒叶背为主。

  3.合理灌溉。在大豆花荚鼓粒期,遇干旱、土壤墒情不足的情况下应及时灌溉防旱,以满足大豆鼓粒期对水分的需求,减少秕荚。

  4.注意防治病虫害。从大豆苗期开始必须重视蚜虫的发生,防治要早?;云谔乇鹱⒁馑共?、灰斑病、大豆食心虫、豆荚螟和豆天蛾的防治,提高结荚率。

  5.轮作换茬。建立合理的土壤耕作制度,避免重茬种植,可防止土壤养分失调,减少病虫和杂草的危害,减少空秕率。


hg158皇冠 - app注册登录 <cite id="h3r5z"><video id="h3r5z"></video></cite>
<var id="h3r5z"><video id="h3r5z"></video></var><cite id="h3r5z"></cite>
<ins id="h3r5z"><span id="h3r5z"></span></ins>
<var id="h3r5z"><span id="h3r5z"><menuitem id="h3r5z"></menuitem></span></var>
<cite id="h3r5z"></cite>
<var id="h3r5z"><noframes id="h3r5z"><menuitem id="h3r5z"></menuitem><var id="h3r5z"></var>
<var id="h3r5z"><video id="h3r5z"><menuitem id="h3r5z"></menuitem></video></var><menuitem id="h3r5z"><strike id="h3r5z"><thead id="h3r5z"></thead></strike></menuitem><cite id="h3r5z"><span id="h3r5z"></span></cite>
<ins id="h3r5z"><span id="h3r5z"><var id="h3r5z"></var></span></ins>
<cite id="h3r5z"></cite>
<var id="h3r5z"></var>
<var id="h3r5z"><strike id="h3r5z"></strike></var>
<ins id="h3r5z"><video id="h3r5z"><var id="h3r5z"></var></video></ins>
<var id="h3r5z"></var><cite id="h3r5z"><span id="h3r5z"><var id="h3r5z"></var></span></cite>
<cite id="h3r5z"><span id="h3r5z"></span></cite>
<var id="h3r5z"></var>
<cite id="h3r5z"></cite>
<cite id="h3r5z"></cite><cite id="h3r5z"><strike id="h3r5z"><menuitem id="h3r5z"></menuitem></strike></cite><var id="h3r5z"><video id="h3r5z"></video></var>