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辣椒苗徒长怎么办?控旺需要这么做

放大字体  缩小字体 发布日期:2018-06-08  来源:安信种苗官网  作者:青桐  浏览次数:41
核心提示:夏季定植辣椒苗,经常会发生植株徒长的现象。辣椒苗徒长后,营养生长过剩而生殖生长不足,常导致坐不住果、畸形果、膨果慢等一系列问题。
         夏季定植辣椒苗,经常会发生植株徒长的现象。辣椒苗徒长后,营养生长过剩而生殖生长不足,常导致坐不住果、畸形果、膨果慢等一系列问题。
辣椒6
 

      辣椒苗徒长的原因

      1、温度过高特别是夜温过高。一旦夜温过高,尤其是高于20℃以上时,辣椒苗呼吸作用加大,过量消耗有机营养,出现徒长现象。

      2、光照弱如遇连续阴雨、遮阳网覆盖时间过长、田间郁蔽等,使得光合作用时间短,制造养分少,植株的向光性常使茎叶争光,进而出现徒长。

      3、田间湿度过大如遇连续阴雨天气或浇水过勤等,都会导致茎叶生长迅速。

      4、氮肥用量过高特别是铵态氮肥用量过大,更易导致茎叶徒长现象。

      控辣椒苗旺长措施

      1、辣椒苗徒长初期采用物理控旺法,如控水、控肥、控温等。控温主要是指控制夜温,可通过合理整枝、地面覆盖秸秆、用无纺布遮挡大棚墙体或在大棚后墙种植蔓生植物等措施减少储热。

      2、针对徒长明显的辣椒苗最直接有效的办法是化学控旺法。常用的控旺药剂有多效唑、助壮素、矮壮素等。助壮素、矮壮素等使用相对安全,但是建议控制一定的用量和间隔期,助壮素不超过750倍、矮壮素不超过1500倍,使用间隔期至少在7天以上。

 
关键词: 辣椒苗徒长
 
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