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耕翻作业除掉地面残茬、杂草固然有利于播种,但同时也破坏了对地面的保护,导致土壤风蚀、水蚀加剧;旋耕切碎土壤,创造了松软细碎的种床,但同时又消灭了土壤中的蚯蚓与生物,使土壤慢慢失去活性。耕作强度愈大,土壤偏离自然状态愈远,自然本身的保护功能、营养恢复功能就丧失愈多,要维持这种状态的代价就愈大。近几十年来,我国机械耕作活动增强,农作物产量大幅度上升,但河流泛滥、沙尘暴猖獗、土壤退化、作业成本上升也是不争的事实。保护性耕作取消铧式犁翻耕,在保留地表覆盖物的前
Tillage over the ground to remove stubbles, of course, is conducive to seeding weeds, but also undermines the protection of the ground, leading to soil erosion, water erosion intensified; Rotary shredded soil, creating a soft and fine seedbed, but at the same time Elimination of earthworms and organisms in the soil, the soil slowly lost its activity. The greater the tillage intensity, the farther the soil deviates from its natural state, and the more its own natural protective function and nutrition recovery function will be lost. The more it is to maintain this state of affairs. In recent decades, China’s mechanical farming activities have been enhanced and crop yields have risen sharply. However, it is an indisputable fact that rivers are flooding, dust storms are rampant, soil degradation and operating costs are rising. Conservation tillage removes the plow tillage before retaining the ground cover