Coffea arabica (cv Catuaí) production and bean size under different population arrangements and soil water availability Produ o e tamanho de gr os de café (Coffea arabica L.) cv Catuaí em diferentes arranjos populacionais e disponibilidades de água no solo

The purpose of this research was to evaluate the effect of drip irrigation under different population arrangements on the phytometric features, coffee productivity and bean size classification according to sieve retention. The experiment with Coffea arabica L. cv Catuaí was carried out in Mococa, S o Paulo, Brazil. The experimental design was a 6 x 2 factorial scheme in randomized blocks, with four replications. The six densities of plantation were E1 (1.60 x 0.50 m); E2 (1.60 x 0.75 m); E3 (1.60 x 1.00 m); E4 (3.20 x 0.50 m); E5 (3.20 x 0.75 m) and E6 (3.20 x 1.00 m), which were divided according to the availability of water (irrigated - I - or non-irrigated - NI - groups). Data were submitted to analysis of variance and averages compared by Tukey test at 1 and 5% of probability. Descriptive analysis of coffee beans according to sieve classification was performed. Irrigation promoted an increase in plant height, crown diameter and production of processed coffee when compared with the NI group. Interaction between population arrangement and irrigation was observed, with an increase in production and crown diameter as the spacing was decreased. Therefore, irrigation provided significant increase in coffee bean size. O objetivo deste estudo foi avaliar o efeito da irriga o por gotejamento em diferentes arranjos populacionais nas características fitométricas, na produtividade de café beneficiado e na classifica o dos gr os por tamanho, de acordo com a reten o em peneiras. O experimento foi conduzido em Mococa-SP, com o cafeeiro Coffea arabica L. cv Catuaí. Adotou-se o delineamento experimental em blocos ao acaso, em esquema fatorial 6 x 2, com quatro repeti es, sendo seis densidades de plantio: E1 (1,60 x 0,50 m); E2 (1,60 x 0,75 m); E3 (1,60 x 1,00 m); E4 (3,20 x 0,50 m); E5 (3,20 x 0,75 m), e E6 (3,20 x 1,00 m), divididas em irrigadas (I) e n o irrigadas (NI). As variáveis foram submetidas à análise de variancia, e as médias, comparadas entre si pelo teste de Tukey, a 1 e 5% de probabilidade. Foi realizada análise descritiva dos gr os nas classes de peneiras. A irriga o promoveu aumento na altura das plantas, maior diametro de copa e produ o de café beneficiado quando comparado ao sistema n o irrigado. Houve intera o entre arranjo populacional e irriga o, com aumento na produ o e no diametro da copa, conforme o espa amento era reduzido. O uso da irriga o propiciou aumentos significativos na granulometria dos gr os de café.