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本文在温室进行了不同石膏施用量(各占土壤石膏总需要量的33％,67％和100％)和碱性水灌溉对碱土Ca沉淀和Na淋移的影响研究并调查了水稻的生长。Ca和碳酸钙沉淀及土壤Na饱和度随着灌溉水碱度的增加而增加。碱土开垦初或在水稻、小麦生长期间每次灌溉(Cei)时,施用石膏可增加土壤Na~+的淋移,降低交换性Na(ESP)含量和PH值,在碱性水灌溉条件下,即使碱土开垦初施用大量石膏,也不能把ESP值控制在水稻、小麦正常生长的水平,但在Gei(碱性水中添加石膏)处理条件下,碱性水灌溉观察到的土壤pH和ESP值与优质水灌溉相似,所以,碱性水灌溉改良碱土必须添加额外的石膏(比开垦初还要多)以减小钠吸附比(SAR)和水的碱度,控制土壤Na的升高并增加作物产量。
The effects of different gypsum application rates (accounting for 33%, 67% and 100% of the total soil gypsum demand) and alkaline water irrigation on Ca precipitation and Na leaching in alkaline soil were investigated and the growth of rice was investigated. Ca and calcium carbonate precipitation and soil Na saturation increased with the increase of irrigation water alkalinity. During the initial reclamation of alkaline earth or each irrigation (Cei) during the growth of rice and wheat, the application of gypsum can increase the Na + leaching and decrease the exchangeable Na (ESP) content and PH value. Under the condition of alkaline water irrigation, Even if a large amount of gypsum was applied in the early stage of alkaline earth reclamation, the value of ESP could not be controlled at the level of normal growth of rice and wheat. However, the soil pH and ESP observed by alkaline water irrigation under the treatment conditions of Gei (alkaline water added gypsum) Therefore, Alkaline Water Irrigation improves the alkaline earth by adding additional gypsum (more than in early reclamation) to reduce the sodium adsorption ratio (SAR) and water alkalinity, control soil Na uptake and increase crop Yield.