Nutrient Availability, Growth and Yield of Rice as Influenced by Basal Application Timings of Organic Sources of Nitrogen in INM Approach

Abstract

To study Nutrient availability growth and yield of rice as influenced by basal application timings of organic sources of nitrogen in INM approach field experiments were conducted during kharif season of 2019 and 2020. The study area was CRC of Sardar Vallabhbhai Patel University of Agriculture and technology, Meerut. Soil of experiment site was low in organic carbon, available nitrogen, medium in available phosphorus and potassium with slightly alkaline pH. Fourteen different treatments comprising substitution of 25 and 37.5% N through dhaincha and vermicompost incorporated on planting date, five day before planting and ten day before planting date along with rest of nitrogen and recommended P K and Zn through chemical fertilizers were tested in a randomization block design with three replications. Rice variety Pusa basmati 􀂱1509 was grown during kharif season of both the year. Observations on different growth parameters yield and yield attributing characters, nutrient content, nutrient availability in soil at different growth stages of rice were recorded. Data were subjected to statistical analysis on which basis treatments effect were explained. The results reveal that growth parameters and yield attributing characters of rice crop were higher with the substitution of 25% N through dhaincha incorporated on planting date and rest amount of nitrogen, recommended dose of P, K and Zn through chemical fertilizer(T5). On pool basis grain and straw yield in T5 was non significantly higher than T4,T6,T7,T8,T11 while differ significantly at different stages from other treatments. Nutrients content and uptake was comparatively higher in T5 than the other treatment. The nutrients availability in soil was affected by time of incorporation. Organic carbon, pH and electrical conductivity of soil at different growth stages of rice remained unaffected due to application of different treatments. Availability of N, P, K, S and Zn in soil differ significantly under the influence of different treatments at different growth stages. Residual soil fertility was comparatively higher in treatments where to substitute 37.5% N vermicompost was applied on planting date. Subsititution of 25% N through dhaincha and incorporated on planting date or vermicompost 10 days before planting resulted in better partial factor productivity, Agronomic efficiency and apparent recovery. On the economic basis, T2, followed by T5 were found best with maximum net return and higher benefit cost ratio. On the basis of two year pooled data it can be concluded that 25% N requirement of rice crop can be substituted through dhaincha incorporated on planting date or vermicompost incorporated 10 days before transplanting, as these treatments yielded non significantly higher than T2,T4,T7,T8 and 11.