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采用恒温土壤培养实验的结果表明,尿素在滇池北岸蔬菜地土壤中转化速率非常快,培养3天尿素水解了90%左右。施用硫磺2周后,土壤pH从8.15下降到7.5左右,施S0对减少土壤氨挥发可能是有利的。DCD对尿素在土壤中水解具有显著抑制作用,但S0、DCD对尿素水解协同效应不明显,主要是由于该类型土壤中尿素水解和S0分解不同步,前者显著快于后者。为了发挥施S0在减少氮素流失效果,建议S0施用时间比尿素早2周左右。S0施用能显著延缓土壤铵态氮的硝化作用。因此,S0与DCD合理配合施用,对减少氮素向滇池水体迁移可能具有实践意义。
The result of constant temperature soil culture experiment showed that the conversion rate of urea in vegetable soil in the north bank of Dianchi Lake was very fast, and the urea hydrolysis was about 90% in 3 days. After 2 weeks of application of sulfur, the soil pH dropped from 8.15 to about 7.5, and application of S0 to reduce soil ammonia volatilization may be beneficial. DCD had a significant inhibitory effect on the hydrolysis of urea in soil, but the synergistic effect of S0 and DCD on urea hydrolysis was not obvious, mainly because the urea hydrolysis and S0 decomposition in this type of soil were not synchronized, the former was significantly faster than the latter. In order to exert S0 in reducing the effect of nitrogen loss, it is recommended S0 application time about 2 weeks earlier than urea. S0 application can significantly retard the nitrification of soil ammonium nitrogen. Therefore, S0 and DCD with reasonable cooperation, to reduce the nitrogen migration to Dianchi Lake may have practical significance.