Soil Fertility, Phosphorus Fractions, and Maize Yield as Affected by Poultry Manure and Single Superphosphate

摘要

A field experiment was conducted in 2007 and 2008 on a slightly acidic alfisol. Poultry manure (PM) was applied at 0, 5?t?ha?1, 10?t?ha?1, 15?t?ha?1, and 20?t?ha?1 in combination with SSP at 0, 15?kg?P?ha?1, 30?kg?P?ha?1, 45?kg?P?ha?1, and 60?kg?P?ha?1, which was replicated three times. The pH and organic C were significantly increased by the application of PM alone while available P was highly increased by the sole application of SSP. Plant tissue P was significantly increased with the application of 30?kg?P?ha?1 while the largest grain yield was obtained when PM at 20?t?ha?1 was combined with SSP at 60?kg?P?ha?1. The buildup of organic P was observed when PM was applied at 15?t?ha?1 while the combination of the two treatments increased residual P and Fe-P. However, P occlusion was effectively reduced with the sole application of PM. Organic P and residual P however had a strong positive relationship with the grain yield. Comparing the sole and combined application of the treatments, the combined application was more effective for most of the parameters observed.