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Abstract
Organic inputs are believed to be able to increase soil phosphorus (P) availability. Natural fallow and pig slurry amendments are the two important organic inputs for agricultural soils. The purposes of the study are to investigate P accumulation and to compare the differences of P fractionation patterns as affected by natural fallow and pig slurry drip irrigation in a coastal saline soil. The study showed that P accumulation occurred mainly in upper soil profiles and that natural fallow or pig slurry drip irrigation alone would not significantly influence total P distribution in soil profiles. However, soil P fractionation demonstrated that, from bottom to top, bioavailable P content and percentage increased whereas residual P percentage declined. The percentage of extractable inorganic P was almost twice as much as that of extractable organic P. In comparison with natural fallow conditions, under pig slurry drip-irrigation conditions, the transformation efficiency of superphosphate fertilizer HCl Pi into residual P was lower whereas the transformation efficiency of superphosphate fertilizer HCl Pi into bioavailable P was higher. The higher bioavailable P percentage and lower average Corg/P ratio in a long-term pig slurry drip-irrigation plot than those in other plots indicated that long-term pig slurry drip-irrigation was more efficient in improving soil P availability than natural fallow and short-term pig slurry drip irrigation.
Acknowledgments
We gratefully acknowledge the Zhejiang Provincial Major Technologies Research and Development Program (Grant No. 2006C13036), Zhejiang Provincial Major Bidding Program (Grant No. 06ZDZB15ZD), National High-Tech Research and Development Program of China (863 Program, Grant No. 2006AA06Z344), and Zhejiang Provincial Natural Science Foundation Program (Grant No. Z5080203 and Y5080110) for support of this work.