地膜覆盖栽培中的问题及防止办法

• 作 者: 刘景春 刘亚东
• 机 构: 吉林省通化农业学校,
• 出 处: 农村科学实验
• 发表日期: 2000年03期
• 关键词: 地膜覆盖栽培 作物幼苗 苗期管理 中冲 早衰现象 种植密度 底墒不足 栽培效益 适宜密度 缺苗断垄

一、烤苗与寒苗苗期管理不善,会发生烤苗、寒苗现象。发生烤苗的原因:一是放风不及时或放风量不够,膜下高温烤伤作物幼苗;二是定植孔封闭不严,膜下高温高湿气体从孔中冲散而出,伤害作物茎叶。防止办法是及时放风炼苗,平时要把苗孔及定植孔封严。发生寒苗(包括霜冻和冷害)的原因:一是播种、定植偏早,二是倒春寒。防止办法是增加临时覆盖物防寒。

First, roasted seedlings and cold seedlings Poor management, there will be roasted seedlings, cold seedlings phenomenon. The reasons for the occurrence of roasted seedlings: First, the wind is not timely or the amount of ventilation is not enough, the film under high temperature roasted crop seedlings; Second, the planting hole closed lax, high temperature and humidity under the film from the hole in the leaves, hurt crop stems and leaves . Prevention is timely disseminated vaccine, usually need to seedlings and planting holes sealed. Cold vaccine (including frost and chilling injury) causes: First, sowing, planting earlier, and second, late spring cold. Prevention is to increase the temporary cover cold.