Effects of time, phosphate fertilizer sources and rates on maize grain yield at Bako
1997
Tolesa Debele (Bako Research Center (Ethiopia))
Efficient use of phosphate fertilizers can be made by matching the source of phosphate, the amount in the soil, crop type and yield expected. This study examined the effects of lime, phosphate fertilizer sources and rates on maize grain yield. The experiment was laid out in RCBD in an incomplete factorial arrangement with four levels of P2O5 (0, 37.5, 75 and 112.5 kg/ha) each from Triple Super Phosphate (TSP) and Diammonium Phosphate (DAP), source, phosphate fertilizer source and interaction between lime and phosphate source were non-significant on maize grain yield; liming and DAP source, respectively. The effect of phosphorus fertilizer rate on maize grain yield was significant (p less than 0.001). Under both DAP and TSP sources, maize grain yield increased as the rates of phosphorus increased. It was concluded that application of 37.5 kg/ha or p2O5 is agronomically optimum and economically profitable whatever the source of phosphate was. This recommendation remained robust when maize price was reduced by 10 percent and fertilizer cost was increased by 10 percent. However, with the concurrent changes in field prices of maize and fertilizer, MRR in moving from 0 to 37.5 kg/ha of P2O5 decreased by 26.57 percent below the previous margin.
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