Análise de crescimento e evapotranspiração do feijão (Phaseolus vulgaris L.): comparação de alguns parâmetros observados com os simulados pelo modelo RAMS.

Abstract

The experiment was realized in the experimental field of the da Empresa Estadual de Pesquisa Agropecuária da Paraíba - EMEPA, located in the Lagoa Seca city (7°9'20"S; 35°51'26"W; 634m), being agriculture its main economic activity, with prominence the cuiture of the beans, during 14 June to 02 August Í999, with objective to evaluate the growth and development of the beans, as well as determining the real evapotranspiration of the cuiture in study in different population densities and comparing the data observed with the simulated ones for the Regional Atmospherics Modeling System (RAMS). The experimental area corresponds to the dimensions of 29 m x 15 m, divided in five tablets canalized with four handling, where each handling was differentiated by the number of plants, corresponding to one, two, three and four plants for hollow. The monitoring of the agrometeorologics conditions was carried through the temperature and relative humidity of air, precipitation, global solar irradiation, insolation, speed of the wind, temperature and humidity of the ground, evidencing that the cuiture were submitted to the variations of 21 °C at 30°C, 42% at 80%, 169 mm, 300 the 500 cal.cm"2, 1.5 hs 10 hs, 19 km/day at 30 km/day, 29°C at 32ÒC 0.10 at 0.20 cm3/cm3 respectively. It analyzes it of growth was made by means of the leaf area index, rate of net assimilation eliminates, rate of relative and absolute growth, that discloses with exception of the leaf area index, small differences between the handlings. The real evapotranspiration was lesser in the handling 1 and greater in handlings 3 and 4, during practically ali the cycle of the cuiture, what it reflected considerability in the income of the same one, where 2,817 respectively handlings 3 and 4 had relieved kg/hec and 3,099 kg/hec, while handling 1 had an income of only 1,263 kg/ha. The definitive values of evapotranspiration, temperature and humidity of air had been compared with the simulated ones for the Regional Atmospheric Modeling Systens (RAMS), were evidenced the accuracy of the model in the simulation of this variable, as also the importance of the leaf area index of the cuiture in the determination of these parameters on the studied cuiture.