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通过大田施用锌肥情况调查与土壤分析,室内进行土柱表面加锌淋洗试验和土壤对锌的吸附试验,研究硫酸锌在水稻土中的垂直移动及其对提高土壤有效锌的作用。 结果为:(1)水稻土中锌向下移动的距离很短,施用的锌大部分集中在土壤表层,15～30cm土壤有效锌增加很少,30～40cm几乎没有增加;(2)磷、锌同时施用,并没有降低土壤有效锌数量;(3)使用硫酸锌后不仅提高了土壤有效锌水平,而且在水稻植株和糙米中的含锌量也有明显的增加。
Through field survey and soil analysis of zinc fertilizers application, zinc leaching test on soil column surface and zinc adsorption test in soil were conducted to study the vertical movement of zinc sulfate in paddy soil and its effect on increasing soil available zinc. The results are as follows: (1) The distance of zinc moving downwards in paddy soil is very short, most of the applied zinc concentrates on the surface layer of soil, the available zinc in 15 ~ 30cm soil increases little, but hardly increases in 30 ~ 40cm; (2) Zn application at the same time did not reduce the amount of available zinc in the soil. (3) Zinc sulfate not only increased the available Zn in soil, but also significantly increased the zinc content in rice plants and brown rice.