Studies On The Indiges Of P Availability , Its Fixation And Release Pattern In Soils Of Jumar River Subcatchment Area
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Date
1989
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Birsa Agricultural University, Ranchi
Abstract
A bench mark study with respect to P status, relationship between different indices of P and soil properties, P-fixation and release pattern was carried out in soils of Umendanda series under Jumar river sub catchment area of Ranchi.
The results indicated that a major proportion of these soils fall under medium and high P status soils. The different forms of P viz., Bray P₁. Olsen P and Morgan P varied widely and their mean values obtained were 55.91, 50.21 and 11.21 kg P₂05 hal respectively. The total P content also showed wide variation ranging from 1284.96 to 3952.35 kg P2°5 ha-1 with a mean value of 2241.78 kg P₂0 ha-1. The soils of this series were poor in organic carbon but rich in sesquioxide. The pH of these soil ranged from 5.0 to 6.0 with the dominance of sandy loam texture.
Correlation studies between different indices of phosphorus and soil properties showed that sand fraction correlated negatively and significantly with available P but did not show any correlation with total P and sesquioxide.
Kinetics of P desorption indicated that application of high amount of P in high P status soil desorbed more P in comparison to low P status soil, where lower dose of P was applied. However, desorption in initial extraction showed same value under both conditions. Incubation studies in low,medium and high P status soil indicated direct and interaction effect of period of incubation, level of P and time of shaking in desorbing phosphorus from soil,