论文部分内容阅读
地膜覆盖栽培作物是一项增产增收的新技术,已在生产上广泛应用。近年来推出的黑色地膜,经过三年试验、观察、研究,发现有其独特性能和增产效果。具体表现为:黑膜透光率低,辐射热透过少,因而被覆盖土壤的土温日变化辐度较小。据试验测定,黑膜覆盖的土壤,1.5寸处增温幅度为2—5℃,而透明膜为5—10℃。由于增温幅度小,比较适合作物根系正常生长,特别对土温要求不高的番茄、菜豆、甜椒等蔬菜生长更为有利。由于黑膜覆盖土壤升温少,在植株生长盛期土温比透明膜、裸地都要低1—2℃,所以,能防止高温对作物的不良影响。
Film-mulching cultivation of crops is a new technology that increases production and income, has been widely used in production. In recent years the introduction of black plastic film, after three years of testing, observation, research, found its unique properties and yield. The concrete manifestation is that the black film has low light transmittance and less radiant heat penetration, so the diurnal variation of soil temperature is smaller. According to the test determination, the black film covered soil, 1.5-inch temperature range of 2-5 ℃, while the transparent film is 5-10 ℃. As the warming rate is small, more suitable for the normal growth of crop roots, especially on the soil temperature less demanding tomatoes, beans, sweet pepper and other vegetables grow more favorable. As black soil covering the soil less warming, soil temperature in the plant growth period than the transparent membrane, bare ground should be low 1-2 ℃, therefore, to prevent the adverse effects of high temperatures on crops.