Correlation-Regression Studies on Independent and Dependent Variables and Quality of Soybean [Glycine max (L.) Merrill] as influenced by Phosphorus, Sulphur fertilization, and Plant Growth Regulator

An experiment was conducted during kharif season in 2020 at Instructional Farm, College of Agriculture, Ummedganj, Kota. The experiment comprised 24 treatment combinations, having four levels of phosphorus viz., 0, 20, 40 and 60 kg ha-1, three levels of sulphur viz., 15, 30 and 45 kg ha-1 and foliar spray of gibberellic acid viz., no spray and spray of GA3 @ 75 ppm laid out in sub-sub split -plot design with three replications. Application of 40 and 60 kg P2O5 ha-1 were found at par with each other in respect of seed yield (1877 and 1956 kg ha-1), respectively over control and 20 kg P2O5 ha-1. Application of 60 kg P2O5 ha-1 was produced significantly higher protein content (40.44 %) and protein yield (787 kg ha-1) in soybean seed over rest of the phosphorus levels. The data further revealed that under application of 60 kg P2O5 ha-1 was recorded maximum oil content (21.01 %) and oil yield (413 kg ha-1) over 20 kg P2O5 ha-1 and control. However, it was found at par with application of 40 kg P2O5 ha-1.
Application of 45 kg sulphur ha-1 gave a significantly higher seed yield (1742 kg ha-1), which was found at par with 30 kg sulphur ha-1(1684 kg ha-1) over the application of 15 kg sulphur ha-1. The maximum protein content (40.30 %) and protein yield (700 kg ha-1) were recorded with the application of 45 kg sulphur ha-1, which was found at par with 30 kg sulphur ha-1 over the application of 15 kg sulphur ha-1. Results revealed that under application of 45 kg sulphur ha-1 was recorded maximum oil content (20.67 %) and oil yield (364 kg ha-1) over 15 kg sulphur ha-1. However, it was found at par with the application of 30 kg sulphur ha-1. A significantly higher seed yield (1770 kg ha-1) was recorded under application of GA3 @ 75 ppm as foliar spray over no spray. The maximum protein content (39.36 per cent) and protein yield (695 kg ha-1) were recorded with the application of GA3 @ 75 ppm as foliar spray over control in soybean. The data further revealed that foliar spray of GA3 @ 75 ppm gave maximum oil content (20.08 per cent) and oil yield (359 kg ha-1) in soybean over control. Phosphorous and sulphur is an important macronutrient required for plants, animals as well as human. Their deficiency in soil is a worldwide concern for production of food crops. The gibberellic acid constitutes a group of tetracyclic diterpenoids, involved in plant growth and development. Therefore, present investigation was done to study influenced of phosphorus, sulphur and gibberellic acid on nutrient content and uptake of soybean.