Comparison of Livestock Manure Compost and Chemical Fertilizer Application in Distribution of P Fractions at Reclaimed Land Soils

Abstract

In order to compare phosphorus (P) behavior of livestock manure compost (LMC) and chemical fertilizer (CF) applied to the sea-reclaimed land soils, incubation experiments were conducted for five weeks. Four soils differing textural classes, sandy loam and clay loam, and electric conductivity (EC) value, high and low, were applied with CF and LMC. LMC was applied at the level of 0, 1, 2, and 3% on the soil weight basis and CF was applied at the same levels of P as LMC. The results showed that increase of P application rate of CF and LMC led to linearly increase available P₂O 5 and 0.01M CaCl₂ extractable P contents regardless of soil texture and EC. However, 0.01M CaCl₂ extractable P from soil applied with CF was significantly higher than with LMC. Correlation analysis between 0.01M-CaCl₂ extractable P and fractionated P by different extraction methods showed that 0.01M-CaCl₂ extractable P positively correlated with KCl-P (soluble and exchangeable P) and HCl-P (Ca and Mg bound P). However, NaOH-P (Fe and Al bound P and organic P) and residual P was adverse. The amount of NaOH-P significantly influenced to the amount of 0.01M CaCl₂ extractable P of CF and LMC in the soils. The application of LMC at sandy loam soil could be carried out in the consideration of nutrient leaching and crop uptake.