ESTIMATION OF PERIODIC PHOSPHORUS UPTAKE BY SUMMER GROUNDNUT IN RELATION TO PHOSPHORUS LEVELS
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Date
1988
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AAU, Anand
Abstract
An experiment with five levels of phosphorus (0, 25, 50, 75 and 100 kg/ha) on summer groundnut crop in latin square design was conducted during summer 1987 at Agronomy Farm, B.A, College of Agriculture, Anand with a view to estimate and study the behaviour of periodic phosphorus uptake in relation to phosphorus levels. The study revealed that summer groundnut crop did not respond to phosphorus to the phosphorus application for pod yield but responded to cumulative as well as periodic dry matter production, in case of phosphorus content appreciable increase was observed upto the dose of 50 kg/ha of P2O5. Summer groundnut considered about 20 kg P2O5 per hectare with the pod yield level 828 and dry matter 4792 kg/ha. The maximum uptake was observed during the period after 90 days of sowing. The correlations among phosphorus uptake, phosphorus content, dry matter production at different stages and pod yield revealed that phosphorus uptake in the initial stage and during 60 to 90 days period after sowing has appreciable influence on pod yield and dry matter production of summer groundnut. No depletion of P2O5 was observed In lower (22.5 to 45 cm) and upper (0 to 22.5 cm) depth over the growing period of the crop which Indicated that there is natural release of available phosphorus In the soil from the reserve pool. The comparison of available phosphorus at lower and upper depth revealed no evidence to suggest loss of P2O5 due to leashing. Significant and positive correlation between i the available phosphorus at upper depth with pod yield during 90 to 125 days indicated the favourable effect of available phosphorus on the pod yield, increase in phosphorus uptake with Increasing available phosphorus at upper depth was indicated by significant and positive association between them.
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AGRICULTURAL STATISTICS, AGRICULTURE, A STUDY