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[1]WANG Rui,WANG Baiqun,WANG Hao,et al.Effects of Long-term Application of Nitrogen and Phosphorus Fertilizers on Potassium of Lu Soil[J].Research of Soil and Water Conservation,2017,24(04):53-58.

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Effects of Long-term Application of Nitrogen and Phosphorus Fertilizers on Potassium of Lu Soil

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 24 Number of periods: 2017 04 Page number: 53-58 Column: Public date: 2017-08-28

Title:: Effects of Long-term Application of Nitrogen and Phosphorus Fertilizers on Potassium of Lu Soil

Author(s):: WANG Rui¹, WANG Baiqun^1,2,3, WANG Hao¹, ZHANG Yan¹; 1. College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China;
3. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China

Keywords:: soil potassium; microbial biomass potassium; long-term fertilization; Lu soil

CLC:: S153.6⁺1

DOI:: -

Abstract:: Based on field experiment of the long-term fertilization with wheat-corn rotation, soil total potassium, available potassium, slowly available potassium, and microbial biomass potassium were investigated for examining the effects of fertilization on soil potassium and the changes of soil inorganic potassium and microbial biomass potassium during winter-wheat growth. The results showed that different application amounts of N and P had little effect on soil total K, but had significant effect on soil available potassium, slowly available potassium and microbial biomass K. Soil available potassium and slowly available potassium decreased with the increase of fertilizer amount, while microbial biomass K increased with the increase of fertilization amount, and soil available potassium, slowly available potassium and microbial biomass K in 0—20 cm soil layer were higher than those in 20—40 cm soil layer. The contents of soil available K and microbial biomass K in the wheat growth period showed a fluctuating trend. Soil microbial biomass K is significantly positively correlated with organic C and total N, but is not significantly correlated with available potassium and slowly available potassium. The application of N and P fertilizers within a certain range promoted the inorganic K depletion and increased the content of microbial biomass K in the soil, which is the result of crop absorption, fertilization, management and other environmental factors.

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