硫磺改良盐渍土效果初探

采用田间试验方法,探索了以硫磺为改土材料对渭南盐渍土的初步改良效果。结果表明,硫磺的施用对于土壤及作物(棉花)的养分状况表现出一定的改善作用;并且降低了土壤pH值,相对于施用石膏的处理,硫磺在降低土壤pH上有更明显的作用;另外,虽然硫磺的施用增加了土壤中各离子的含量及EC值,但随着硫磺用量的逐渐增加,土壤中各离子含量及EC值呈现出降低的趋势。因此,硫磺的施用对于该地土壤具有一定的改良作用。但是,虽然结果显示硫磺在该地土壤的改良中起到了一定的作用,但总体效果有限,其主要原因可能是硫磺施用量太低(试验中最高用量为225 kg/hm2),因此,在本试验基础上如果进一步加大硫磺用量将可能会对该地盐碱化土壤具有更为明显的改良作用,但最佳施用量还需要进一步研究。

A preliminary study on amendment of saline soil through addition of sulfur

Weinan is located in the eastern part of Guanzhong Plain which has the second largest area of saline soil in Shaanxi Province.Soil salinization not only reduces the productivity of agricultural soil,but also directly affects the sustainable development of agricultural system.So it is very important to find out effective measures to ameliorate these soils.A field experiment for amendment of saline soil with sulfur as material was conducted in Weinan,Shannxi Province in 2006.The results indicated that,over 2 months after addition of sulfur to saline soil,the soil nutrient status was improved and the total N and P concentration of cotton plants was increased;and the soil pH was decreased.In addition,the contents of seven ions(potassium,sodium,calcium,magnesium,bicarbonate,sulfate and chlorine) and EC values of soil tested were decreased with the sulfur adding.However,there was a decline trend of these ions contents and EC values with the increase of sulfur usage dose.Although the sulfur indicated a obvious amendment effects to the saline-alkali soil in Weinan saline soil area,the effect was limited under the current low rates of sulfur addition(the largest sulfur application amount was 225 kg/hm2 in this study).Therefore,further field experiment is necessary for investigate the effects of sulfur especially in the aspect of sulfur application on saline-alkali soil.