Comparative effects of Minjingu phosphate rock and triple super phosphate on residual P in an Ultisol
Abstract
101 words
A glasshouse experiment was conducted at Sokoine University
of Agriculture to compare the effects of Minjingu Phosphate
Rock (MPR) and Triple Super Phosphate (TSP) on Residual
Phosphorus in an Ultisol. The soil was collected after seven
years since 480 kg/ha fertilizer application was stopped. MPR
and TSP fresh application increased significantly (P= 0.05) the
soil phosphorus, maize dry matter yield (DMY), P concentration
and uptake. Both residual P from MPR and TSP treated soil
were comparable in Bray I, maize DMY, and P uptake although
the values were lower than for fresh application. The values
were above the suggested critical concentration.
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