Resumo

CISNEROS ZAYAS, Enrique et al. Yield response of the coffee to irrigation management. Water-yield function. Rev Cie Téc Agr [online]. 2015, vol.24, n.4, pp. 5-11. ISSN 2071-0054.

The water availability for agriculture is diminishing progressively, due to the competition among different users, what imposes an efficient use of this important resource. To be able to increase water productivity it is indispensable the study of the water-yield functions. The present study was aimed at determining the different forms of expression of the water-yield functions, as well as the productivity of the water (WP) for coffee. As a result a lineal pattern was obtained for a better adjustment of the relationships yield/evapotranspiration and yield/water irrigation applied during the irrigation of the coffee, with higher coefficients of determination to 0.70 and an efficiency of the water evapotranspiration around 0.75 kg of gold coffee for each additional millimeter of water. The results of the analysis of the functions using relative values showed that if there are satisfied to 100% the needs of the coffee during the whole cycle of the culture can wait a maximum yield of 2,78 t·ha^-1, and if it is possible to satisfy in more than 80% the yield could be superior to 2,6 t·ha^-1. The factor of response of the coffee yield (Ky) under the conditions of this study turned out to be of 0.52. For each cubic meter water consumed and water applied by each irrigation, the coffee produces as average 1.92 and 3.8 kg gold coffee respectively. The maximum productivity was obtained with 5 399 m³·ha^-1 of water consumed during all the year.

Palavras-chave : water productivity; hydric deficit; yield.

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