ISSN: 0041-3216 (Online), 0041-3216 (Print)
Volume 70 Number 4
Transformation of labile P in two alkaline soils amended with Sesbania aculeate at two moisture regimes
Labile organic and in organic P in an alkaline sandy loam and loamy sand (Typic Ustochrepts) amended with dried Sesbania aculeata and incubated for periods ranging from 10 to 100 days was investigated. A significant decrease in soil labile organic P occurred with a simultaneous increase in the labile or dissolved inorganic P soluble in 0.5M NaHCO3. The decrease in labile organic P is explained by its rapid mineralization to inorganic P. Dissolved organic P, therefore, makes a significant contribution towards the P nutrition of crops, a factor relevant to soil management.
Keywords: Green manure; organic P; Inorganic P