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[1]GUO Hong,LIU Tianpeng,DU Yifei,et al.Spatial Variability of Soil Nutrients in the Apple Orchards on the Scale of County in the Loess Plateau[J].Research of Soil and Water Conservation,2015,22(03):21-27.

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Spatial Variability of Soil Nutrients in the Apple Orchards on the Scale of County in the Loess Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 03 Page number: 21-27 Column: Public date: 2015-06-28

Title:: Spatial Variability of Soil Nutrients in the Apple Orchards on the Scale of County in the Loess Plateau

Author(s):: GUO Hong¹, LIU Tianpeng², DU Yifei¹, WANG Zhikang¹, FANG Kaikai¹, LI Huike^1,3; 1. College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. Fruit Industry Bureau, Huangling, Shaanxi 727300, China;
3. Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China

Keywords:: soil nutrients; semi-variance analysis; spatial variability; spatial distribution

CLC:: S158.9

DOI:: -

Abstract:: Spatial variability of soil nutrients was studied based on geostatistics and spatial analysis of GIS by collecting 304 soil samples (0—40 cm) from apple orchards in Huangling County which is one of the main apple producing county in the Weibei area of the Loess Plateau, Shaanxi Province, and determination of the soil nutrients in order to provide scientific guidance for the reasonable fertilization. The results showed that the variation coefficients of the soil nitrate and available P were the largest, and the smallest for pH. The order of the variation coefficient of soil nutrients was nitrate N > available P > total P > ammonium N > available K > total K > total N > CEC > organic matter > pH. The fitting semi-variance model for total P and organic matter was Gaussian, and the best matching effect of soil total N, ammonium N and available K was the spherical model, soil total K got the best effect usig the linear model, but the soil available P, pH, nitrate N and CEC were well discribled by exponential model. The results of semi-variance analysis showed that the nugget/sill ratios of soil pH, ammonium N, available P, available K and CEC were 0.17%, 7.47%, 11.81%, 2.95% and 24.24%, respectively, and their spatial correlations were very strong. The nugget/sill ratios of soil organic matter, total N, total P and nitrate N were 40.72%, 28.16%, 46.44% and 49.98%, respectively, their spatial correlations were medium. The nugget/sill ratio of soil total K was 100%, their spatial correlation was very weak. In the study area, we found that the contents of soil organic matter and N were low, but the soil P and K were high. It is needed to increase the amount of organic fertilizer, and keep the rational rates of the N, P, K fertilizes in the future.

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