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为探索砒砂岩与沙的最佳混合比例,使其大规模应用于毛乌素沙地土地整治,发展农业种植,防止地下水污染。本文进行了不同比例的砒砂岩与沙复配土种植玉米的小区试验,在玉米生长期采集不同深度的土壤测其铵态氮和硝态氮含量,对不同混合比例下复配土的氮素淋失特性进行研究。结果表明:(1)铵态氮含量在各混合比例的复配土中较低,均在2.5mg/kg以下,未出现累积情况;(2)砒砂岩与沙在不同的混合比例下均存在硝态氮淋失;(3)砒砂岩与沙混合比例为1∶2时,硝态氮主要累积在0-40cm,且无机氮累积量最高,其玉米产量高达9 900kg/hm2。对种植玉米而言,推荐采用1∶2的砒砂岩与沙混合比例进行推广开发。
In order to explore the best mixing ratio of sandstone and sand, it should be applied to land reclamation in Mu Us sandy land on a large scale to develop agricultural planting and prevent groundwater pollution. In this paper, different proportions of sandstone and sand compound soil planting maize plot experiments were conducted to collect ammonium and nitrogen nitrate at different depths during the growth of maize. The effects of nitrogen Leaching characteristics were studied. The results showed that: (1) The contents of ammonium nitrogen in the mixed soil with different mixing ratios were all lower than 2.5mg / kg, and no accumulation occurred. (2) The sandstone and sand were all existed at different mixing ratios (3) When the mixing ratio of sandstone and sand is 1: 2, the nitrate nitrogen mainly accumulates in 0-40cm, and the inorganic nitrogen accumulates the highest with the yield of corn reaching 9 900kg / hm2. For planting corn, it is recommended to use 1: 2 ratio of sandstone and sand to promote the development.