On-line version ISSN 1678-4596
AMARAL, José Francisco Teixeira do et al. Nutrients use efficiency by coffee cultivars. Cienc. Rural [online]. 2011, vol.41, n.4, pp.621-629. Epub Mar 18, 2011. ISSN 1678-4596. http://dx.doi.org/10.1590/S0103-84782011005000027.
To elucidate the differences in the nutritional requirements among the cultivated varieties of plant species is a form of obtaining higher productivity and to optimize the fertilizer use. This work had as objective to evaluate the root and shoot production efficiency of four arabic coffee cultivars ('Acaiá IAC 474-19', 'Icatú Amarelo IAC-3282', 'Rubi Mg-1192' and 'Catuaí Vermelho IAC 99') per unit of N, P, K, Ca, Mg, S, B, Cu and Zn absorbed. For this purpose an experiment was carried out in field conditions at the Universidade Federal de Viçosa. The treatments were settled in a 4x3 factorial arrangement (four cultivars and three fertilization levels; low, normal and high) in randomized blocks with four replications. The plants of the normal fertilization level received fertilization based on previously determined coffee plant recruitment. The plants of the levels low and high received, respectively, 0.4 and 1.4 times the normal fertilization doses. The efficiency of production of roots was differentiated among them cultivate when there was restriction in the amount of supplied fertilizers (low level), did not have differences among them when normal and high dose of fertilizers was used. When cultivate in the low fertilization level 'Acaiá IAC 474-19' presented highest efficiency to the production of roots per unit of N, P, K, Ca Mg and S absorbed, while in the some condition 'Rubi Mg-1192' presented the smallest. It was concluded that efficiency of utilization of nutrients for root and shoot productions were differentiated among cultivars.
Keywords : Coffea arabica L.; mineral nutrition; nutritional efficiency.