硫磺改良对宁夏引黄灌区盐碱土pH及微量元素有效性的影响研究

采用田间试验方法,以单纯施用氮磷肥和施用石膏为对照,施入不同数量的硫磺,通过对土壤pH和有效性微量元素的影响评价盐碱土的改良效果。结果表明:施用2 000 kg/hm2石膏和S1(施硫1 000 g/hm2)、S2(施硫2 000 kg/hm2)、S3(施硫3 000 kg/hm2)3个水平硫磺处理,都有降低pH值的作用;其中,施硫1 000 kg/hm2(S1)处理效果最好。氮磷肥配合施用硫磺和石膏,对4种微量元素铜、锌、铁、锰有效性有一定的影响,但是,除个别处理对有效铁和有效锌的影响达到显著水平外,其它处理的影响都不是太明显。因此,单纯施用化肥、化肥配合硫磺施用以及化肥配合石膏施用都可以在一定范围内起到改良碱土、降低土壤pH的作用。

Research on effect of sulfur application on saline-alkaline soil pH and availability of trace elements in Huanghe River irrigation district in Ningxia

A field test method was carried out with single application of N, P and K fertilizer and gypsum as the comparison, in which different amount of sulfur was applied, and by measuring pH and available microelements to study the effects of sulfur on the improvement in saline-alkaline soil. The results indicate that application of 2000 kg/hm² gyp-sum and three levels of sulfur treatment, which is S1(sulfur 1 000 kg/hm²) , S2(sulfur 2 000 kg/hm²)and S3(sulfur 3000 kg/hm²),could all effectively lower pH; Among them, the effect of 1 000 kg/hm² sulfur application(S1) is the best. Nitrogen and phosphorus with sulfur and gypsum application on the effectiveness of four kinds of trace elements have a certain impact. But, in addition to individual treatment on the effective state of iron and zinc could reach a signif-icant level of influence, other treatment efects are not very obvious. Therefore , single application of fertilizer, chemical fertilizer application together with sulfur, as well as chemical ferilizer application together with gypsum can improve with-in a certain range the alkaline soil and reduce soil pH.