论文部分内容阅读
对河南省几种主要土壤全硫和有效硫含量进行了测定 ,结果表明全省耕地有 1/ 2面积属缺硫或潜在性缺硫。主要作物硫肥田间小区试验结果表明增产效果显著 :施硫使小麦增产 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施石膏 ,而大豆施石膏增产效果则大于施硫磺。如果维持当前土壤硫素水平 ,每年需补充硫 4 8～ 85 kg/ hm2。
The total and effective sulfur contents of several main soils in Henan Province were determined. The results showed that 1/2 of the cultivated land in the province belongs to sulfur deficiency or potential sulfur deficiency. The test results of the main crop sulfur fertilizer field plots showed that the yield-increasing effect was remarkable: sulfur application increased wheat yield by 3.5% -13.4%, corn yield by 3.5% -11.7% and soybean yield by 7.1% -13.5%. Under the same condition of applying sulfur, the effect of increasing yield of sulfur in wheat and corn was greater than that of gypsum, while the yield of soybean gypsum was larger than that of sulfur. If the current soil sulfur level is maintained, sulfur should be added from 48 to 85 kg / hm2 annually.