Effect of Phosphorus and Sulphur Levels on Growth, Nodulation and Yield of Soybean [Glycine max (L.) Merrill] in South-Eastern Part of Rajasthan

An experiment was conducted at Instructional Farm, College of Agriculture, Ummedganj, Kota during kharif, 2021. The twelve treatment combinations comprised of four levels of phosphorus viz., 0, 20, 40 and 60 kg ha-1 allocated in main plots and three levels of sulphur viz., 15, 30 and 45 kg ha-1 in sub plots. Results showed that application of 60 kg P2O5 ha-1 had significant effect on plant height at 60 DAS and at harvest, number of total root nodules plant-1, effective root nodules plant-1 and dry weight of root nodules at 45 DAS, chlorophyll content at 45 DAS and leaf area index at 50 DAS of soybean over application of 20 kg P2O5 ha-1 and control but it was found at par with 40 kg P2O5 ha-1. The maximum seed yield (1942 kg ha-1) and straw (3305 kg ha-1) yield of soybean were recorded under application of 60 kg P2O5 ha-1 over application of 20 kg P2O5 ha-1 and control but it was found at par with 40 kg P2O5 ha-1. Significantly higher plant height at 60 DAS and at harvest, number of total root nodules plant-1, effective root nodules plant-1 and their dry weight at 45 DAS, chlorophyll content at 45 DAS, leaf area index at 50 DAS, seed yield (1870 kg ha-1) and straw yield (3179 kg ha-1) of soybean were recorded under application of 45 kg sulphur ha-1 which was found at par with 30 kg sulphur ha-1 and both these sulphur levels gave significant increase over application of 15 kg sulphur ha-1.