PJB-2023-494
Rizwan Ali
Abstract
ABSTRACT
Soybean (Glycine max. L. merr.), which is a member of the legume family holds great importance as a major oilseed crop in Pakistan. Given the substantial gap between the production and consumption of edible oil, it is imperative to enhance the yield of oil seed plants in Pakistan. For this purpose, the effects of different nitrogen fixing bacteria and phosphorus levels on the growth and yield of soybean were investigated. The experiment was conducted at the Agronomy Research Farm of University of Agriculture Peshawar using a split plot design with three replications during summer season, 2022. The first factor was nitrogen fixing bacteria, including control, bradrhizobium, azotobacter and azospirillum, and the second factor was phosphorus levels, including P1 (0 kg ha-1),P2 (20 kg ha-1)), P3 (40 kg ha-1) and P4 (60 kg ha-1). Results revealed that days to emergence, days to 50% flowering, and physiological maturity were not significantly influenced by different nitrogen fixing bacteria and phosphorus levels. Plant height was not significantly affected by nitrogen fixing bacteria, but phosphorus levels had a significant impact on plant height giving highest value (66.2cm) at 60 kg ha-1. The highest pod length (3.6cm), number of seeds pod-1 (2.8) number of nodules plant-1 (42), number of main branches plant-1 (9), number of leaves plant-1 (92), thousand grain weight (145), biological yield (10879 kg ha-1), grain yield (2701 kg ha-1), and harvest index (27.4) were recorded in plots Inoculated with bradrhizobium. While the lowest values were recorded at control plots. Moreover, the highest values for pod length (3.7) number of pods plant-1 (74) number of seeds pod-1 (2.8), number of nodules plant-1 (43), number of main branches plant-1 (9), number of leaves plant-1 (90), thousand grain weight (146), biological yield (11033kg ha-1), grain yield (2935 kg ha-1) and harvest index were recorded in plots treated with 60 kg phosphorus ha-1. While the lowest values were recorded at control plots. The interaction between different nitrogen fixing bacteria and phosphorus levels was also significantly higher for most of the parameters including thousand grain weight (150g), biological yield (11701 kg ha-1), and grain yeild (3332 kg ha-1) when treated with bradrhizobium and 60 kg phosphorus. It is concluded that combine application of phosphorus at the rate of 60 kg ha-1 with bradrhizobium inoculation is better for increasing the productivity of soybean.
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