Assessment of Different Approaches of Fertilizer Recommendation to Soybean Glycine max L Merrill in a Vertisol and Their Impact on Soil Properties in Northern Transitional Zone of Karnataka

Abstract

A study on the effect of different fertilizer recommendation approaches on yield, newlinequality, nutrients uptake by soybean, residual nutrients status and their transformation in newlinesoil was conducted at the Main Agricultural Research Station, University of newlineAgricultural Sciences, Dharwad during kharif 2015 and 2016 with 12 treatments newlinereplicated thrice in RCBD. newlineTargeted yield of 30 q ha-1 under SSNM recorded significantly higher seed yield newline(30.91 q ha-1) over all other treatments except 35 q ha-1 target yield under SSNM. It was newlinebecause of higher number of seeds plant-1 (210.3), seed yield plant-1 (31.15 g), test newlineweight (15.35 g), uptake of NPK and S (191.8, 24.9, 93.7 and 20.1 kg ha-1, respectively) newlineand Zn, Fe, Mn and Cu (449.5, 1732.5, 662.0 and 152.6 g ha-1, respectively). newlineAccordingly, B:C ratio was also highest (2.88) and least value (2.11) was recorded in newline150 per cent RDF. There was significant improvement in protein (38.05 %) and oil newline(18.83 %) contents in seeds. newlineThe residual nitrogen and potassium status in soil at 40 DAS and at harvest were newlinesignificantly higher in SSNM targeted yield of 35 q ha-1 compared to other treatments newlineexcept yield target of 30 q ha-1 under SSNM while the residual phosphorus content in newlinesoil was higher in 150 per cent RDF followed by 125 per cent RDF and target yield newline35 q ha-1 under SSNM. Control recorded higher residual sulphur status in soil compared newlineto others. Similar trend was observed in different fractions of NPK and S nutrients. newlineEnzyme activities in soil at 50 DAS were significantly higher in 30 q ha-1 newlinetargeted yield of SSNM over other treatments except targeted yield of 35 q ha-1 under newlinethe same practice. Hence, yield maximization in soybean can be achieved through target newlineyield of 30 q ha-1 under SSNM. newline