Abstract
Experiments were conducted to investigate the effect of crop development on evapotranspiration and yield of beans ( Phaseolus vulgaris L.) at the Instituto Agronômico (IAC), Campinas, State of São Paulo, Brazil, during the dry season of 1994. A completely randomized design was carried out with three population density treatments and four replications. The treatments were: (a) crop sown in evapotranspirometers at a density of 50 plants m −2, and thereafter thinned to 25 plants m −2, when the canopy achieved full ground cover; (b) crop sown with population densities of 14 and 28 plants m −2 in an irrigated field. Crop growth was evaluated considering dry matter (DM), vegetative ground cover (GC%) and leaf area index (LAI). These parameters were successfully related to basal crop coefficient ( k cb) and crop coefficient ( k c), demonstrating the strong dependence of both coefficients on canopy development. A simulation study was carried out and showed that k cb based on LAI would allow good estimates of water use for different plant density populations in the field.
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