Krishnamayee Sethi, Rabindra Kumar Paikaray, Rasmirekha Pattnaik and Sabek Kumar Hantal
Abstract
A field experiment conducted during the rabi season of 2017-18 at Orissa University of Agriculture and Technology, Bhubaneswar, to evaluate the effects of soil test-based fertilizer recommendations (STBF) and foliar sprays of nutrients on nutrient uptake of black gram and the residual soil fertility status. The treatments allocated to black gram, consisted of soil test based fertilizer recommendation (STBF), 2 sprays of 2 % urea, 2 sprays of 2 % DAP, 2 sprays of 2 % NPK (18:18:18), STBF + 1 spray of 2 % urea, STBF + 1 spray of 2 % DAP, STBF + 1 spray of 2 % NPK (18:18:18), STBF + 2 sprays of 2 % urea, STBF + 2 sprays of 2 % DAP, STBF + 2 sprays of 2% NPK (18:18:18), STBF + 1 water spray and control (1 water spray) replicated thrice in randomized block design. The results showed that the total uptake of N, P and K was found higher in STBF + 2 sprays of 2 % NPK (18:18:18) with their respective values of 57, 5.3 and 32.3 kg ha-1 which is followed by STBF + 2 sprays of 2% DAP. There were improvements in N and P2O5 status of the soil due to various treatments except control (water spray). The increment in N ranged from 1.9 to 13.3 kg ha-1 and P2O5 from 1.5 to 12.8 over control. The K status was found more only with STBF along with two sprays. The maximum increase of N, P2O5 and K2O were noticed with STBF + 2 sprays of 2 % NPK (18:18:18). Application of STBF + 2 sprays of 2 % NPK recorded the maximum crude protein content in seed (21.1 %) and also in haulm (13.6 %) followed by STBF + 2 sprays of 2 % DAP with respective values of 20.8 % and 13.1 %. The crop with 2 sprays of 2 % NPK (18:18:18) at pre flowering and flowering stage recorded the maximum N use efficiency (61.7 kg seed kg N applied-1) and N recovery (363.9 %). Higher N-recovery indicated that more depletion of soil available nitrogen.