Effects of nitrogen rates and frequency of application on coffee yield and quality in Kenya

An investigation on nitrogen rates and frequency of application on coffee yield and quality was conducted over a period of ten years at Mariene in the eastern zone of Kenya. There was positive clean coffee yield response to fertilizer applications. Although there was no consistent significant differences between the nitrogen rates, timing of application and their interactions, the lower rate of 50 kgN/ha applied four times a year in March, May, October and December gave the highest positive response. High frequencies of applications were observed to be more effective at lower rates of applied nitrogen but the effect diminished as the rates were raised. However, at very high rates of application, the high frequency of applications were also noted to give higher responses than the lower number of applications. A general increase in large sized beans (per cent grade "A" sized coffee beans) with fertilizer applications was observed. Where fertilizer was split into four applications a year,higher proportion of the percent grade "A" sized beans were recorded

Bibliographic Details

Main Author:	99509 Njoroge, M.J.
Format:	biblioteca
Published:	Mar
Subjects:	COFFEA ARABICA, DOSIS DE APLICACION, FERTILIZANTES NITROGENADOS, METODOS DE APLICACION, AUMENTO DEL RENDIMIENTO, CALIDAD, KENIA,
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