Authors

Abstract

The purpose of this research was to study heat and moisture retention and breaking force properties of different plastic mulches. The field experiments with different plastic mulches were carried. The results showed that, the fracture strength and the right-angle tear strength of reinforced mulch are superior to those of weather-resistant mulch and ordinary mulch. The soil moisture, humidity and daily mean temperature under plastic mulches were affected by the laying time at a 1% probability level. It was also found that the variety had no significant effect on daily mean temperature under plastic mulches. A strong correlation was found between breaking force and the laying time of plastic film. A multiple linear regression model was developed to determine the relationship between the heat and moisture retention properties and breaking force. The R2 values of three plastic mulch varieties regression model were 0.904, 0.913 and 0.931. The breaking force of reinforced mulch and weather-resistant mulch indicates that plastic mulch recovery should be conducted after autumn, before it is too weakened by exposure.

Abstract in English

本研究旨在探讨不同塑料地膜的保热保湿性及破断力特性。进行了不同地膜覆盖的田间试验及破裂力试验。结果表明，加强型地膜的断裂强度和直角撕裂强度均优于耐候地膜和普通地膜。地膜覆盖对土壤水分、湿度和日平均温度受铺膜时间的影响十分显著（P<0.01）。不同品种对地膜覆盖下的日平均气温无显著影响。破断力与覆膜时间有较强的相关性。建立了多元线性回归模型，确定了地膜下土壤温湿度与破断力的关系，三个地膜覆盖回归模型的R2值分别为0.904、0.913和0.931。以免地膜强度过低，地膜回收应在棉花收获后立即进行。