Long Term Effect of Integrated Nutrient Management on Soil Properties and Productivity of Toria (Brassica campestris) in an Inceptisol under Rainfed Upland Condition of North Bank Plains Zone of Assam

摘要

A field experiment was conducted to study the effect of integrated nutrient management on soil properties and productivity of toria at Biswanath College of Agriculture, Biswanath Chariali, Assam. The experiment was carried out during 2010-11 to 2014-15 in Randomised Block Design with eleven treatment combinations and three replications consisting of organic and inorganic inputs. The soil of the experimental site was sandy loam in texture with acidic in reaction (pH 5.05). The initial fertility statusof soil was medium in available N (385.73 kg/ha), medium in available P (12.33 kg/ha) and medium in available K (148.08 kg/ha). After five years of experimentation increasing fertility trend was observed under T4 (75% RDF + 5 t/ha vermicompost) treatment. The application of 75% RDF + 5 t/ha vermicompost (T4) recorded significantly higher yield, benefit cost ratio, Rain Water Use Efficiency (RWUE) along with significant improvements in soil physical and chemical properties. However, application of vermicompost @ 3 t/ha along with 75% RDF also sustained the toria productivity and was at par with application of 75% RDF + vermicompost @ 5 t/ha in respect of toria productivity and soil properties.