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
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Date
2017-10
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University of Agricultural Science, Dharwad
Abstract
A study on the effect of different fertilizer recommendation approaches on yield, quality, nutrients uptake by soybean, residual nutrients status and their transformation in soil was conducted at the Main Agricultural Research Station, University of Agricultural Sciences, Dharwad during kharif 2015 and 2016 with 12 treatments replicated thrice in RCBD.
Targeted yield of 30 q ha-1 under SSNM recorded significantly higher seed yield (30.91 q ha-1) over all other treatments except 35 q ha-1 target yield under SSNM. It was because of higher number of seeds plant-1 (210.3), seed yield plant-1 (31.15 g), test weight (15.35 g), uptake of NPK and S (191.8, 24.9, 93.7 and 20.1 kg ha-1, respectively) and Zn, Fe, Mn and Cu (449.5, 1732.5, 662.0 and 152.6 g ha-1, respectively). Accordingly, B:C ratio was also highest (2.88) and least value (2.11) was recorded in 150 per cent RDF. There was significant improvement in protein (38.05 %) and oil (18.83 %) contents in seeds.
The residual nitrogen and potassium status in soil at 40 DAS and at harvest were significantly higher in SSNM targeted yield of 35 q ha-1 compared to other treatments except yield target of 30 q ha-1 under SSNM while the residual phosphorus content in soil was higher in 150 per cent RDF followed by 125 per cent RDF and target yield 35 q ha-1 under SSNM. Control recorded higher residual sulphur status in soil compared to others. Similar trend was observed in different fractions of NPK and S nutrients.
Enzyme activities in soil at 50 DAS were significantly higher in 30 q ha-1 targeted yield of SSNM over other treatments except targeted yield of 35 q ha-1 under the same practice. Hence, yield maximization in soybean can be achieved through target yield of 30 q ha-1 under SSNM.