Effects of phosphorus application rate and distribu¬tion in the soil on phosphorus uptake by cotton (gossypium ssp.)
2000
Njoka, E.M.(Egerton University, Department of Agronomy, Njoro, Kenya)
Soil Phosphorus (P) Supply to plant roots increases after addition of P fertilizer due to both the increase in Soil Solution P (PI)and adsorbed P (Ps). Little information is available on the effect of added P on the concurrent increase in pI and PS. Soil Supply characteristics of Gigger silt loam soil was studied to establish the partition¬ing of added P between solution and adsorbed forms. Five treatments of P in triplicate 0, 200, 400, 600 and 800gm p /kg soil were used for the study. Values for P in solution were obtained from P analysis of displaced soil solution and value for adsorbed P were obtained from extraction with anion exchange resin. There was a curvi - linear relationship between Padded and P in solution. At low amount of added P low levels of P was found in Soil solu¬tion. There was a quasi linear relationship between added P and P removed by the anion - exchange resin. The highest shoot yield of DPL51 variety of cotton was real¬ized at 600mg P /kg soi1.
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