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对棉花薄膜育苗移栽时苗床的播种期问题,近年来各地看法不一.有的认为早播较好,在3月10日前后即开始播种.有的则认为晚播较好,可延迟到4月上旬.从近年来试验结果和大面积生产实践来看,我们认为,必须根据薄膜内小气候的效应与当地自然气温条件,来确定苗床的播种期.为了观察苗床的小气候效应,1980年将自记温度计安装在小百叶箱内(避免阳光直射),并分别置在薄膜内外,各离地20厘米处.自4月26日至5月9日,连续测定14天.膜内外温度日变化是:上午膜
On the cotton seedling transplanting seedbed sowing problems in recent years, different views, and some believe that early sowing better, began sowing before and after March 10. Some believe that late sowing is good, can be delayed until In early April, from the experimental results and large-scale production practices in recent years, we believe that the sowing period of the seedbed must be determined according to the microclimate in the film and the local natural temperature conditions. In order to observe the microclimate effect of the seedbed, Self-recording thermometer installed in the micro-leaf box (to avoid direct sunlight), and were placed inside and outside the film, respectively, 20 cm from the ground from April 26 to May 9, continuous determination of 14 days. Diurnal changes in membrane temperature Yes: AM film