Response of yield and yield components of faba bean (Vicia faba, L.) to increasing levels of nitrogen and phosphorus under two levels of plant stand density.

摘要

Two field experiments were carried out in Ain Shams University of Agriculture experimental farm, at Shalakan, Egypt during 1998-99 and 1999-2000 seasons, to investigate the effect of N (30, 45 or 60 kg/fed) and P (15.5, 23.25 or 31 kg/fed) fertilization, and plant density (133333 or 88889) on yield and yield components of faba bean plants. Treatments were arranged in split plot design. Data revealed that lower plant density at 88889 plants/fed gave significantly the highest number of branches (4.2), pods (20.3), seeds per pod (3.6) and seeds per plant (60.2), weight of pods (35.6 g), pod length (7.3 cm) and seed index (78.8 g/100 seed) than 133333 plants/fed, while the reverse was true for plant height, and seed and straw yields/fed. Increasing nitrogen from 30 to 60 kg/fed increased yield and yield attributes. N at 45 kg/fed increased seed yield by 550 and 200 kg/fed over those receiving 30 or 60 kg N/fed, respectively. The response of seed yield and yield attributes of faba bean plants to P fertilization, followed the same trend as that of N fertilization. However, 31 kg P2O5/fed increased seed yield by 550 and 340 kg/fed compared to those receiving 15.5 and 23.25 kg P2O5/fed, respectively. Straw yield followed a similar trend. The highest seed yield was obtained at 133333 plant density, and 45 kg N/fed and 31 kg P2O5/fed, while the highest straw yield was obtained from 133333 plant density, 60 kg N/fed and 31 kg P2O5/fed.