Concentration maps of six heavy metals in farmland soils obtained by kriging interpolation. Combined with statistical and geostatistical spatial structure analysis, We found the soil heavy metals has many source, and the spatial distribution affected by various factors.
3．通过克里格插值得到6种重金属含量的空间分布图，结合统计分析以及空间结构分析进一步分析表明，研究区域农田土壤重金属来源较多，空间分布受多种因素影响。
参考来源 - 阜新市农田土壤重金属污染的空间分析及污染评价·2,447,543篇论文数据，部分数据来源于NoteExpress
The nutritive peculiarities of crops, fertilizer and soils are described. Meanwhile the nutrient balances of farmland in several typical areas of China are also estimated.
对农作物、化肥和我国土壤营养特性作了简要描述，并对全国和几个典型地区的农田养分平衡作了估算。
The paper discusses the effect of Cu pollution in various soils on the yield of rice. The viewpoint about the critical value of Cu pollution in farmland and decreasing rice yield is described.
该文探讨了各类土壤中铜污染对水稻产量的影响，并就农田中铜污染浓度与水稻减产的临界值作了阐述。
This study determined infiltration into soils on black farmland under different tillage systems by long-term experiment.
通过田间长期定位试验，探讨了耕作措施对农田黑土耕层水分的影响。
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