Reducing Phosphorus Release from Paddy Soil by Coal Ash and Phospho-Gypsum Mixture
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Abstract
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 con- tent 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. In contrast with W-P, plant available phosp- horus increased significantly with the mixture application due to high content of phosphorus and silicate in the mixture. The mixture of coal ash and phosphor-gypsum (50:50, wt wt-1) would be a good alternative to reduce a phosphorus export in rice paddy soil together with increasing rice yields.
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