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为了寻求水肥资源的合理利用方式,以九农21为材料,于2008年研究了遇旱灌水和施肥方式对大豆各生育期、各土层土壤中铵态氮和硝态氮变化的影响。结果表明,从各土层土壤中的铵态氮和硝态氮含量来看,灌水前优化施肥处理对保持土壤中的铵态氮和硝态氮含量效果明显,尤其是R1和R5期,减少了土壤中的氮损失。用地质统计学中的区域化变量理论和半方差函数分析,从变程值来看,灌水对优化施肥处理的铵态氮和硝态氮空间变异性程度影响较大;此外块金值与基台值之比较小,分别为0.02和0.21,表明由土壤的空间结构本身引起的空间变异性占主要部分,说明优化施肥处理对改变土壤的空间结构具有良好的作用。
In order to seek the rational utilization of water and fertilizers resources, the paper studied the effects of drought-resistant irrigation and fertilization on the changes of ammonium nitrogen and nitrate nitrogen in soils during different growing stages and soils. The results showed that optimizing the fertilization treatment before irrigation was effective in keeping the contents of ammonium nitrogen and nitrate nitrogen in soil, especially in R1 and R5 stages, and from the content of ammonium nitrogen and nitrate nitrogen in soil, Soil nitrogen loss. According to the regionalized variable theory and the semi-variance function analysis of geostatistics, from the perspective of variable values, irrigation has a great effect on the degree of spatial variability of ammonium nitrogen and nitrate nitrogen in the optimized fertilization treatments. In addition, The difference of the table values is relatively small, which is 0.02 and 0.21, respectively, indicating that the spatial variability caused by the soil spatial structure itself accounts for the major part, indicating that optimizing the fertilization treatment has a good effect on changing the spatial structure of the soil.