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Long-term effects of fertilization on the forms and availability of soil phosphorus in rice paddy
Authors:Lee Chang Hoon  Park Chang Young  Park Ki Do  Jeon Weon Tae  Kim Pil Joo
Affiliation:Division of Applied Life Science, Graduate School, Gyeongsang National University, 900, Kaswa-dong, Chinju, 660-701, South Korea.
Abstract:The changes in total P accumulation and P compounds with time in the plough layer in a paddy soil in southern Korea were investigated in relation to the continuous application of chemical fertilizers (NPK), straw based compost (Compost), combination these two (NPK+Compost) for 31 years. Continuous fertilization increased the total and inorganic P contents in plough layers. In NPK, inorganic P fraction did not change with time, but organic P content increased significantly. Long-term application of chemical fertilizer together with compost accelerated the decrease in the organic P fraction, presumably due to promoting microbial activity in the plow layer, and then increased significantly inorganic P fraction. Compost application decreased the residual P and Fe-P fractions and then increased inorganic P fraction, in spite of continuous compost application. Increase in total, inorganic and extractable P with time may be closely related to the increase in the availability of accumulated P for rice growth.
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