AVAILABILITY OF PHOSPHORUS IN SOIL UNDER THE INFLUENCE OF ORGANIC MANURES
Abstract
Author(s): M. Manimaran
An incubation experiment was conducted with the same set of three soils with five different organics (green manure, farmyard manure, vermicompost, pressmud and poultry manure) to find out the release pattern of P. the soil samples were analysed for available P once in 15 days up to 75 days. The experimental soil was sandy clay loam in texture which comprised of 74.01% sand, 4.35% silt and clay 21.30%. It was neutral in reaction (pH 7.3), non saline in nature with electrical conductivity of 0.21 dSm-1 and cation exchange capacity of 15.7 cmol (p+) kg-1. The soil samples were analysed for available P once in 15 days up to 75 days.The results of the experiment revealed that with progress of incubation time (0, 15, 30, 45, 60 and 75 days) an increase in the concentration of available P was observed in all the treatments applied. However, addition of green manure (T2) exhibited a significant increase in the concentration of available P at all days of sampling with the mean values ranged from 0.43 to 0.56 ppm. The treatment T2 was followed by T3 (Farmyard manure), T4 (Vermicompost), T5 (Pressmud), T6 (Poultry manure) and T1 (Control) regarding the release of phosphorus. The lowest value was found with control where no manure was applied. Key words: Organics, Phosphorus, Incubation, Release pattern
