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2004•T'u Jang T'ung PaoRequires access

Spatial Variability of Nutrients in Vegetable Soil

Chen Wan-zhen

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Abstract

Spatial variability of nutrients in vegetable soil was studied by geostatistics and spatial analysis, along with investigation on farmers' fertilization. The result showed that great difference among farmer's fertilization rates was found, and relative too much P was used, whereas K was too less. Variation coefficients of soil OM, (NH_4~+-N), P, K, Ca, Mg and S fluctuated between 28.4% and 69.2%. Soil OM and NH_4~+-N presented strong spatial dependence, and soil P,K, Ca, Mg and S moderate spatial dependence. Isoline maps of soil nutrients indicated that spatial distribution of OM was similar to gradual change of soil texture; NH_4~+-N took on vertical belt distribution from north to south; P, K, Ca, Mg and S tended to be come out as shatters. Conclusively, artificial factors such as fertilization intensified the spatial variability of soil mineral nutrients.

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What this paper is about

Spatial variability of nutrients in vegetable soil was studied by geostatistics and spatial analysis, along with investigation on farmers' fertilization. The result showed that great difference among farmer's fertilization rates was found, and relative too much P was used, whereas K was too less. Variation coefficients of soil OM, (NH_4~+-N), P, K, Ca, Mg and S fluctuated between 28.4% and 69.2%. Soil OM and NH_4~+-N presented strong spatial dependence, and soil P,K, Ca, Mg and S moderate spatial dependence. Isoline maps of soil nutrients indicated that spatial distribution of OM was similar to gradual change of soil texture; NH_4~+-N took on vertical belt distribution from north to south; P, K, Ca, Mg and S tended to be come out as shatters. Conclusively, artificial factors such as fertilization intensified the spatial variability of soil mineral nutrients.

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Available abstract

Spatial variability of nutrients in vegetable soil was studied by geostatistics and spatial analysis, along with investigation on farmers' fertilization. The result showed that great difference among farmer's fertilization rates was found, and relative too much P was used, whereas K was too less. Variation coefficients of soil OM, (NH_4~+-N), P, K, Ca, Mg and S fluctuated between 28.4% and 69.2%. Soil OM and NH_4~+-N presented strong spatial dependence, and soil P,K, Ca, Mg and S moderate spatial dependence. Isoline maps of soil nutrients indicated that spatial distribution of OM was similar to gradual change of soil texture; NH_4~+-N took on vertical belt distribution from north to south; P, K, Ca, Mg and S tended to be come out as shatters. Conclusively, artificial factors such as fertilization intensified the spatial variability of soil mineral nutrients.

Key concepts: Geostatistics, Spatial variability, Nutrient, Spatial distribution, Soil nutrients, Human fertilization, Environmental science, Soil science

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