作物施硫效应与土壤硫素平衡探讨

在河南省几种主要土壤类型上，对几种主要作物进行了施硫肥试验。结果表明，施硫经济效益较好，小麦增产３．５％～１３．４％，玉米增产３．５％～１１．７％，大豆增产７．１％～１３．５％。在施硫量相同情况下，小麦、玉米施硫磺增产效果大于石膏，而大豆施石膏的增产效果则优于硫磺。如要维持当前土壤硫素水平，每年需通过施肥补充３．１～５．６ｋｇ／亩。

Exploration on the Effect of Sulphur Fertilization in Crops and the Balance of Sulphur in Soil

The test of sulphur fertilization with some main crops in several main soil types in Henan province showed that sulphur fertilizer could increase the yield of wheat,corn and soybean by 3.5%13.4%,3.5%11.7% and 7.1%13.5% resp.At same rate of sulphur fertilization,the increasing yield effects by sulphur fertilization in wheat and corn were greater than that by gypsum and the increasing effect by gypsum was better than that by sulphur.If the sulphur content in soil is kept at current level it should be necessary to supplement 4683 kg S/ha into the soil each year.