Effect of integrated nutrient management on production of seed tubers from true potato (Solanum tuberosum) seed

A field experiment was conducted during autumn seasons of 2011 and 2012 at Central Potato Research Sta- tion, Shillong, to study the effect of integrated nutrient management on production of seed tubers of potato (Solanum tuberosum L.) from true potato seed. There were 6 treatments of integrated nutrient management, viz. 100% recommended dose of fertilizers (RDF 120 kg N +52.8 kg P + 50 kg K/ha), 75% RDF and 25% recom- mended dose of nitrogen (RDN) through farmyard manure (FYM), 50% RDF and 50% RDN through FYM, 25% RDF and 75% RDN through FYM, 100% RDN through FYM and control (without application of fertilizer and ma- nure). Integrated use of synthetic fertilizers and organic manures showed the significant impact on growth and yield attributes of potato. Highest average number (984.2 103/ha) and yield of tubers (12.4 t/ha) were recorded with application of 75% RDF through fertilizers and 25% RDN through FYM which was significantly superior over rest of treatments. However, the lowest tuber numbers (478.3 103/ha) and tuber yield (3.3 t/ha) were observed in control plot (no application of any nutrients). Similarly, the maximum net returns were with application of 75% RDF and 25% RDN through FYM. The application of 100% RDN through FYM on nitrogen basis significantly improved soil-fertility status over 100% RDF through fertilizers and control plot but remained at par with other integrated nu- trient sources. Application of 75% RDF through synthetic fertilizers and 25% RDN through FYM was more remu- nerative for sustainable production of potato.