首页|Impact of Long-Term Fertilization on Phosphorus Status in Black Soil
Impact of Long-Term Fertilization on Phosphorus Status in Black Soil
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A twelve-year field trial was carried out to determine the impact of long-term fertilization on phosphorus (P) distribution in the soil profile, P balance, and the transformation and availability of soil P in a black soil (Phaeozem, FAO). Under a wheat-soybean-corn rotation, during twelve years where no fertilizer was applied, crops removed 60 and 81 mg P kg-1 soil in the control and NK treatment, respectively. About one third of the P absorbed by crops was originated from organic P. Ca2-P, Ca8-P, Al-P and Fe-P were the main forms of inorganic P absorbed by crops. The surplus P from fertilization remained in the 0-20 cm soil layer and increased with the application rate of P. The combined application of NP or NPK increased available P to a lesser extent than the combined application of PK. Fertilizer P had mainly transformed to the Al-P, Fe-P, Ca2-P, and Ca8-P forms. By using the P budget (X), changes in total P (Y1) and available P (Y2) in soils under the current cropping system could be predicted by the equations: Y1 = 0.02 + 1.01X and Y2 = 2.08 + 0.15X.
black soilcrop removallong-term fertilizationphosphorus budgetphosphorus fractions
HAN Xiao-Zeng、SONG Chun-yu、WANG Shou-yu、C. TANG
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Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Harbin, 150040 China
Department of Agricultural Sciences, La Trobe University, Bundoora, Vic 3086 Australia
NETL
NSTL
万方数据
维普
