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地膜覆盖栽培棉花,前期可增温保墒、防御不良天气的影响,但不同宽度地膜对土壤温、湿度影响如何,目前尚未见报道。为此,我们于1985年进行了这一试验。试验设棉花宽膜(60厘米)、窄膜(40厘米)覆盖和棉花直播三个处理,4月3日播种,品种为鄂沙28。观测分0、5、10、15、20厘米各层次地温,观测时间为8、14、20时。5—50厘米各层次土壤湿度间隔5天测一次,降水天气顺延,并记载棉花出苗、病害和生育情况。 从观测结果来看,各层次土壤最高、最低温度均以宽膜覆盖为最高,窄膜覆盖次之,直播温度最低,且以土壤5厘米深处温度差异最为明显,日平均地温宽膜比直播高5.9℃,窄膜比直播高2.8℃,这种差异随深度增加而减小。在一般情况下,地膜
Film mulching cultivation of cotton, pre-warming soil moisture, the impact of adverse weather, but the effect of different width of the plastic film on soil temperature and humidity, has not been reported. To this end, we conducted this experiment in 1985. The experiment set cotton wide film (60 cm), narrow film (40 cm) coverage and cotton direct three treatments, April 3 sowing, varieties of E 28. Observation points 0,5,10,15,20 cm ground temperature, the observation time is 8,14,20 hours. 5-50 cm soil moisture levels at all intervals measured once every 5 days, precipitation weather postponed, and records of cotton emergence, disease and fertility. From the observation results, the highest and the lowest temperature of all levels of soil were covered by wide film, followed by narrow film, followed by the lowest direct broadcast temperature. The most obvious difference was the depth of soil 5 cm, High 5.9 ℃, narrow film 2.8 ℃ higher than the direct broadcast, this difference decreases with increasing depth. In general, the film