Pedosphere 15(3): 319--326, 2005
ISSN 1002-0160/CN 32-1315/P
©2005 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Impact of long-term fertilization on phosphorus status in black soil |
HAN Xiao-Zeng 1, SONG Chun-Yu1, WANG Shou-Yu1 and C. TANG2 |
1 Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Harbin, 150040 (China). E-mail: xdhsxzh@mail.hrb.hl.cninfo.ne
2 Department 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) 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, 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. |
| Key Words: black soil, crop removal, long-term fertilization, phosphorus budget, phosphorus fractions |
| Citation: Han, X. Z., Song, C. Y., Wang, S. Y. and Tang, C. 2005. Impact of long-term fertilization on phosphorus status in black soil. Pedosphere. 15(3): 319-326. |
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