[Phaseolus vulgaris L. var cacahuate 72 growth characteristic related with phophorus supply]

Inglés. This study was conducted to analize some growth characteristic of the bean plant (Phaseolus vulgaris L. "Cacahuate 72"), type I, determined habit. The plants were grown in phosphorus-deficiency and phosphorus optimum supply in hydroponic culture greenhouse conditions, rates of 0.5, 2.5, 12.5 and 25.0 ppm H2PO4 in nutrient solution and four phenological stages were selected to evaluate the growth through its indexes. Crop growth rate, leaf area index, leaf area ratio, leaf weight ratio, relative growth rate, specific leaf area and net assimilation rate were calculated. The growth of phosphorus deficient plants was reduced largely and leaf thickness was increased in comparison with the control plants. During the vegetative growth the plant was more efficient in the use of radiant energy, but the growth was greater in the reproductive stage and was associated with greater photosynthetic surface area.

Español; castellano. Se estudiaron algunas caracteristicas del crecimiento del frijol (Phaseolus vulgaris L.), variedad "Cacahuate 72", del tipo I, habito determinado, sometido a deficiencia y buen abastecimiento de fosforo en condiciones de invernadero y sistema hipodronico. Se evaluaron las dosis 0.5, 2.5, 12.5 y 25 ppm de H2PO4 en la solucion nutritiva, en cuatro etapas fenologicas. En las cuales se determinaron el indice de crecimiento de cultivo, indice de area foliar, razon de area foliar, razon de peso foliar, indice de crecimiento relativo, Area foliar especifica y el indice de asimilacion neta. La deficiencia de fosforo limito significativamente el crecimiento, produciendo hojas mas gruesas de lo normal. Durante la etapa fenologica de crecimiento vegetativo la planta de frijol fue mas eficiente en la utilizacion de la energia radiante, sin embargo en la etapa reproductiva del crecimiento fue mayor debido a una mayor superficie fotosintetica.