Standardization of NPK fertigation in tomato (Solanum lycopersicum l.) under naturally ventilated polyhouse
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Date
2022-11
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G.B. Pant University of Agriculture and Technology, Pantnagar, District Udham Singh Nagar, Uttarakhand. PIN - 263145
Abstract
A field experiment was conducted at Vegetable Research Centre of G.B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India during October to April 2020-21 and 2021-22 to study the effect of NPK fertigation levels and its scheduling on tomato (Solanum lycopersicum L.) under naturally ventilated polyhouse. The experiment was laid out in two factorial randomized block design with one additional treatment consisting of four fertigation levels viz., F1 :120 percent of RDF, F2 : 100 per cent of RDF, F3: 80 per cent of RDF and F4 : 60 per cent of RDF and three fertigation scheduling viz., S1 : 15, 10 and 10 per cent N, P2O5 and K2O of fertigation levels between 15-45 days after transplanting (DAT), respectively, 40, 40 and 40 per cent N, P2O5 and K2O of fertigation levels between 46-76 DAT, respectively, 30, 40 and 40 per cent N, P2O5 and K2O of fertigation levels between 77-107 DAT, respectively, 15, 10 and 10 per cent N, P2O5 and K2O of fertigation levels between 108-138 DAT, respectively, S2 : 25 per cent of each N, P2O5 and K2O between 15-46 DAT, 46-76 DAT, 77-107 DAT and 108-138 DAT, respectively and S3: 20, 20 and 20 per cent N, P2O5 and K2O of fertigation levels between 15-46 DAT, respectively, 30, 30 and 30 per cent N, P2O5 and K2O of fertigation levels between 46-76 DAT, respectively, 30, 30 and 30 per cent per cent N, P2O5 and K2O of fertigation levels between 77-107 DAT, respectively and 20, 20 and 20 per cent N, P2O5 and K2O of fertigation levels between 107-138 DAT, respectively, along with one control (soil application of RDF with flooding) replicated thrice. The findings of present investigation revealed that performance of tomato was significantly influenced by different drip fertigation levels and scheduling. Among the different fertigation levels, fertigation of tomato at 120 and 100 per cent of RDF was found at par and significantly better over other fertigation levels with respect to plant growth characters, yield parameters, quality attributes, nutrients content and nutrients uptake by plant and water use efficiency. Among the three scheduling tested, scheduling S1 was found best in terms of growth parameters, yield parameters, quality attributes, nutrient content and uptake in plant. On the basis of pooled data, fertigation at 100 per cent of RDF with scheduling S1 recorded higher yield (189.51t ha-1), net return ( 1,19,647.12) and benefit-cost ratio (2.92) was best treatment combination. Based on the overall performance, it could be concluded that under naturally ventilated polyhouse, fertigation of tomato at 300:150:150 kg N, P2O5 and K2O ha-1 (F2) through scheduling S1 is the best and most economical for cultivation of tomato. Hence, the same is recommended for commercial cultivation of tomato under polyhouse condition.