The effect of organic and inorganic phosphorus, and time of split application of nitrogen on maize in Kenya
1999
Mungai, N.W. Macharia, C.N. | Kamau, A.W. | Macharia, C.N.
Two field experiments were conducted to determine the effect of organic + inorganic phosphorus inputs and time of split application of nitrogen on the grain yield of maize. In the first experiment, two organic materials, Tithonia and maize stover, were combined with inorganic fertilizers. The total amount of nutrient supplied was 175 kg N/ha and 15.5 kg P/ha for all treatments except the control. Results from the two sites for the long rainy season in 1997 showed no significant differences between the treatments. In the second experiment, phosphorus was applied at 60 kg P205/ha and nitrogen at 90 kg N/ha, either at planting and/or V6 or R1 growth stages. Application of nitrogen in two splits at V6 and R1 with phosphate at 60 kg/ha yielded significantly more than the farmer's practice and the control. The results show that applying 30 kg N/ha at V6 followed by 60 kg N/ha at R1 gave significantly higher yields than the other splitting regimes. These results are for one season and they need be verified in three or four seasons.
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