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山东省沂南县自20世纪90年代开始,大量采用旋耕机械进行土壤耕作,而多年旋耕的结果是耕层变浅,犁底层上升。据调查大部分农田耕层厚度为13~15cm,耕层下面形成了比较坚硬的犁底层,严重影响作物根系发育、下扎,大幅缩小了根系吸收养分的范围,制约农作物产量进一步提高。通过土壤改良培肥可以有效增加土壤有机质含量,提高土壤通透性,有利于作物根系的生长,可以提高耕地的保水保肥能力,对增加作物产量,改良土壤结构有着无可替
Yinan County, Shandong Province Since the 1990s, a large number of rotary tillage machines have been used for soil cultivation. As a result of many years of rotary tillage, the tillage layers have become lighter and the ground plow has risen. According to the survey, most of the farmland topsoil has a thickness of 13 ~ 15cm. Under the top of the plow, a relatively hard plow bottom is formed, which severely affects crop root development and rooting, greatly reducing the range of root nutrient uptake and restricting the further improvement of crop yield. Soil improvement and fertilization can effectively increase the content of soil organic matter, improve soil permeability, is conducive to the growth of crop roots, can improve the ability of soil and water conservation, to increase crop yield, improve the soil structure has nothing