Economic analysis of introgen fertilizers in different tea cultivars East and West of the Rift Valley
1998
Kamau, D.M. | Owuor, P.O. | Wanyoko, J.K.
Three fertilizer field experiments were set up using different tea cultivars at different locations, to establish the economic optimum rates of nitrogen fertilizer applications. Economic optimum rates for the three cultivars used worked out from tea yields using the 1994 - 1997 data without considereing the negative effects of fertilizer on quality, demonstrated that the optimum rates varied with cultivars and geographical area of production. Sensitivity analysis based on escalation or reduction of fertilizer costs and tea prices by 20% revealed that the economic optimal rates ranged betwen 18-298, 276-346 and 73-354 Kg N/ha for seedling tea, clone S 15/10 and clone 11/4 respectively, while the economic optimum rates for NPK 20:10:10 on clone S15/10 ranged from 258/332 Kg N/ha. These results showed that it is difficulllt to precisely define the economic optimal rates of nitrogen for low yielding tea due the high sensitivity of the rates to changing economic situations
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