秸稈深埋對土壤鹽堿及養(yǎng)分調(diào)控作用的研究
[Abstract]:The problem of soil salinization is an important factor restricting agricultural production. In view of the problems of high groundwater level, high ratio of evapotranspiration, obvious accumulation of salt table and poor crop yield in Tumechuan Plain, etc. In this paper, the salinized soil of Tumechuan Plain was studied, and the salinization and nutrient changes of soil with different depth of straw mulching were analyzed by using corn straw to improve the salinized soil. The effect of soil salinization and nutrient regulation was studied. The results showed that the treatment of straw in the study area could destroy the continuity of soil capillary, inhibit salt accumulation, decrease salt content in tilling layer, improve soil acid-base environment, and increase soil nutrient content in tilling layer. After 4 months, the salt content of cultivated layer decreased by 2.50 g / kg, and the desalinization rate reached 52.74%. Among the anions, HCO3-,SO42-, was the most effective. The content of Cl- decreased 52.65 and 52.63, respectively. In the cations, the contents of Ca2, Mg2, Na and K decreased by 52.94 and 50.00and 52.78, respectively. The pH value of the tilling layer decreased by 0.31 units, and the alkalinity decreased by 15.14. The content of organic matter in tilling layer increased 10.68%, the content of alkali-hydrolyzed nitrogen increased 11.86%, and the content of available phosphorus increased 16.30%.
【學(xué)位授予單位】:內(nèi)蒙古農(nóng)業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:S156.4
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