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莴苣种植:小拱棚种莴苣需要注意哪些事项?

发布时间:2018-09-05 11:52:33

  【专家解答】小拱棚莴苣管理简单,投入少,一亩地不足千元,一棵莴苣能长到2-3斤,一亩地收入能有上万元。有下面几点注意事项:
 
  一是要把握住定植时间
 
  莴苣一般是在头年秋分左右育苗,立冬的时候定植。莴苣的茎随着植株生长,不断地伸长和膨大,定植过早茎内水分过多,易发生冻害。定植过晚,前期吸收的营养无法供应冬季生长的需要。
 
  二是注意浇水的次数和方法
 
  莴苣从头年定植到第二年五一采收,一般只浇四次水就够了。第一水是定植以后浇,第二水主要是封冻水,封冻水浇完后用废弃的草苫子将畦子覆盖起来,主要是起到保温作用,保证莴苣顺利地度过冬天。后两次浇水时间是在第二年立春气温回升支起拱棚以后到采收前10天左右。
 
  三是注意追肥
 
  每次浇水时配合使用高钾复合肥60-70斤,一是利于膨果,二是防止偏用高氮复合肥造成上部叶片生长过大,形成郁闭的环境,提高病害的发生几率。
 
  四是要注意病害预防
 
  莴苣的病害很少,支起拱棚后应注意每天放风,减小棚内湿度,减少病害发生。温度升上来以后,就不用覆膜了。日常管理中,可以每10-15天喷洒一次百菌清或阿米西达、中生菌素等,预防病害。


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