Fertilizer recommendations based on targeted yield concept involving integrated nutrient management for potato (Solanum tuberosum) in tarai belt of Uttarakhand

摘要

Soil-test crop response of potato (Solanum tuberosum L) was studied in Mollisol during winter (rabi) season 2006-07 Four levels of fertilizer N P K and 3 levels of farmyard manure were randomly distributed in 24 plots and 3 fertility strips with a total of 72 plots Soil and plant analysis data were exploited to formulate fertilizer adjustment equations for each strip with and without farmyard manure at varying yield targets at different fertility levels Co-efficient of determination (R-2) was found significant (0 614**) between yield and soil test values Based on the experiment, the nutrient requirement for producing 100 kg of potato tuber was 0 33 kg of N, 0 05 kg of P and 040 kg of K The per cent contribution from soil was 20 01 8 02 and 19 84 from applied farmyard manure 12 82, 1 32 and 14 49 and from fertilizer 1541, 543 and 26 21 for N, P and K, respectively Verification trial of this experiment was done in the next season ie during winter (rabi) 2007-08 The variation in yield obtained from the targeted yield ranged from +9 77 to -9 76% The farmers practice of fertilizer application and control were least efficient in producing tuber yield of potato Both the highest cost benefit and response ratio was found with farmyard manure 10 tonnes/ha + yield target 2000 kg/ha