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espanolEL objetivo de este trabajo fue evaluar el efecto de la aplicacion de fosfato con una fuente quimica y bio-fertilizante en el crecimiento y rendimiento de judias (Phaseolus vulgaris L.). El experimento se realizo en Khomam, provincia Guilan, al norte de Iran. El diseno experimental fue de bloques completos al azar con arreglo factorial 5X2 con cuatro repeticiones. Los tratamientos fueron aplicacion de fosforo en dosis de 0, 25, 50, 75, y 100 kg ha-1 como superfosfato triple y aplicacion de fosfato bio-fertilizante con semillas inoculadas con Pseudomonas fluorescens y semillas no inoculadas (control). Los resultados indican que la aplicacion de SPT y bio-fertilizantes afecta significativamente la altura de la planta, el numero de vainas por planta, rendimiento y la concentracion de N y P en vainas. Las relaciones entre dosis de fertilizantes fosfatado y bio-fertilizante se expresaron con ecuaciones lineales. Independientemente de la aplicacion de bio-fertilizantes, el numero de vainas aumento significativamente de 55 a 85 vainas por planta cuando la aplicacion de P aumento de 0 a 100 kg ha-1. El rendimiento de vainas aumento a mayor dosis de P de 0 a 100 kg ha-1. El numero de vainas y rendimiento fue significativamente mayor en las parcelas inoculadas con bio-fertilizantes en comparacion con el control, para todas las dosis de fosfato. El numero de vainas por planta y rendimiento se incremento en un 16% y 15%, respectivamente, cuando se aplico bio-fertilizante. Los resultados sugieren que la aplicacion de P en dosis de 100 kg ha-1 y la aplicacion de bio-fertilizante es recomendable para obtener mayor rendimiento de vaina en judias. EnglishA field experiment was conducted at Khomam, Guilan province, northern Iran, to evaluate the effects of phosphorus rate and phosphate bio-fertilizer on growth and yield of green bean (Phaseolus vulgaris L.). The experimental design was a factorial arrangement of treatments based on a randomized complete block with four replicates. Factors were phosphorus fertilizer rates (0, 25, 50, 75, and 100 kg ha-1 as triple superphosphate) and phosphate bio-fertilizer application (seed inoculated with phosphate bio-fertilizer containing Pseudomonas fluorescens strain P5 and strain p13, and non-inoculated (control). Analysis of variance showed that phosphorus rate and phosphate bio-fertilizer had significant effect on plant height, pod number per plant, pod yield and pod N and P concentration. The relationships between phosphorus application rate and pod number per plant and pod yield were well expressed by linear equations. Regardless of phosphate bio-fertilizer application, pod number per plant was significantly increased from 55 to 85 pods per plant as P application rate increased from 0 to 100 kg ha-1. Similarly, pod yield increased linearly with increasing P application rate from 0 to 100 kg ha-1. Regardless of phosphorus rate, pod number per plant and pod yield were significantly higher in plots that received phosphate bio-fertilizer compared to control plots. Pod number per plant and pod yield increased by 16% and 15%, respectively, when phosphate bio-fertilizer was applied. Based on the results of this experiment, P application at the rate of 100 kg ha-1 along with phosphate bio-fertilizer are recommended for obtaining the greatest pod yield in green bean.

Green bean (Phaseolus vulgaris L.) growth and yield as affected by chemical phosphorus fertilizer and phosphate bio-fertilizer