Reducing Phosphorus Release from Paddy Soil by Coal Ash and Phospho-Gypsum Mixture
2005
Lee, C.H. (Gyeongsang National University, Jinju, Republic of Korea) | Lee, Y.B. (Gyeongsang National University, Jinju, Republic of Korea) | Lee, H. (Jinju National University, Jinju, Republic of Korea) | Ha, B.Y. (Namhae Chemical Co. Ltd., Yeosu, Republic of Korea) | Kim, P.J. (Gyeongsang National University, Jinju, Republic of Korea), E-mail: [email protected]
As a silicate source to rice, a coal ash was selected and mixed with phosphor-gypsum (50:50, wt wt-¹ ) to reduce the potential of boron toxicity and to supply calcium element. We expected that high content of calcium in this mixture might convert water-soluble phosphorus to less soluble forms and then reduce the release of soil phosphorus to surface runoff. The mixture was applied with the rate of 0, 20, 40, and 60 Mg ha-¹ in paddy soil (Nagdong series, a somewhat excessively drained loamy fine sand) in Daegok, Jinju, Korea The mixture reduced significantly water-soluble phosphorus (W-P) in the surface soils by shifting from W-P and Fe-P to Ca-P and Al-P during whole rice cultivation.
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