Impact of Long-Term Fertilization on Phosphorus Status in Black SoilEnglish Full Text

HAN Xiao-Zeng1, SONG Chun-Yu1, WANG Shou-Yu1 and C. TANG2 1Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Harbin, 150040 (China). 2Department of Agricultural Sciences, La Trobe University, Bundoora, Vic 3086 (Australia)

Abstract: A twelve-year field trial was carried out to determine the impact of long-term fertilization on phosphorus （P） distribu- tion 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, Cag-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 Cas-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.

Keywords：

black soil; crop removal; long-term fertilization; phosphorus budget; phosphorus fractions;

Series：
(D) Agriculture
Subject：
Fundamental Science of Agriculture; Agronomy
Classification Code：
S158;

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Impact of Long-Term Fertilization on Phosphorus Status in Black SoilEnglish Full Text

HAN Xiao-Zeng1, SONG Chun-Yu1, WANG Shou-Yu1 and C. TANG2 1Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Harbin, 150040 (China). 2Department of Agricultural Sciences, La Trobe University, Bundoora, Vic 3086 (Australia)

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