Pedosphere 3(4): 331--339, 1993
ISSN 1002-0160/CN 32-1315/P
©1993 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of Submergence on Iron Transformation and Phosphorus Availability in Calcareous Soils |
| ZHU XIAO-PING1,2, CAO CUI-YU1,2, YIN JIN-LAI1,2, ZHOU CHUN-LIN1,2 |
| 1.Nanjing Agricultural University, Nanfng 2100142.Agricultural Institute of Coastal Areas, Jiangsu Province, Yancheng 224002 |
| ABSTRACT |
| A thermostatic incubation experiment was carried out to estimate the effects of flooding periods, stalk application and P addition on Fe transformation and P availability in calcareous soils. Submergence increased amorphous Fe, especially in the case of stalk application. The newly formed amorphous Fe with a great surface area played an important role in P sorption; and submergence also stimulated the dissolution of inorganic P, thus increasing the availability of soil P in calcareous soils. Meanwhile, a part of soluble P was adsorbed and fixed again on the surface of newly formed amorphous Fe, thus resulting in a decrease of P availability. Soil rapidly available P increased after ISO-day incubation. There existed significantly negative correlations between soil amorphous Fe content and soil Fe-P and rapidly available P contents. Submerged conditions promoted the transformation of inorganic P added to-ward Fe-P in calcareous soils, especially in the case of stalk application. |
| Key Words: |
| Citation: Zhu, X. P., Cao, C. Y., Yin, J. L. and Zhou, C. L. 1993. Effect of Submergence on Iron Transformation and Phosphorus Availability in Calcareous Soils. Pedosphere. 3(4): 331-339. |
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