PJB-2023-590
effect of different nitrogen fixing bacteria and phosphorus levels on yield and yield components of soybean.
Rizwan Ali
Abstract
Soybean (Glycine max. L. Merr.) which is a member of the legume family holds great importance as an important oilseed crop in Pakistan. It is essential to increase the oil seed plant output in Pakistan due to the significant disparity between edible oil production and demand. To achieve this, research was done on the effects of various phosphorus levels and nitrogen-fixing bacteria on soybean yield. The experiment was conducted at the Agronomy Research Farm, The University of Agriculture Peshawar using a split plot design with three replications during summer season, 2022. The first factor was nitrogen fixing bacteria (control, Bradyrizobium japonicum, Azotobacter chroococcum and Azospirillum brasilense) and the second factor was phosphorus levels (0, 20, 40 and 60 kg ha-1). The highest pod length (3.6 cm), 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 seeds weight (145 g), biological yield (10879 kg ha-1), seed yield (2701 kg ha-1) and harvest index (27.4%) were recorded in plots inoculated with Bradyrhizobium. Moreover, the highest values for pod length (3.7 cm) 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 seed weight (146 g), biological yield (11033 kg ha-1), seed yield (2935 kg ha-1) and harvest index (27%) were recorded in plots treated with 60 kg phosphorus ha-1. The interaction between different nitrogen fixing bacteria and phosphorus levels for most of the parameters including thousand seeds weight, biological yield and seed yield were found significant when treated with Bradyrhizobium and 60 kg phosphorus ha-1. It is concluded that the application of phosphorus at the rate of 60 kg ha-1 with Bradyrhizobium is better for increasing the yield of soybean.
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