Journal
JOURNAL OF PLANT NUTRITION
Volume 41, Issue 15, Pages 1988-2000Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01904167.2018.1484135
Keywords
internal efficiency; NPK recommendation; potato; QUEFTS and tuber yield; site-specific nutrient requirements
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Potato productivity in India is static due to unbalanced use of nutrients and intensive cropping system. Nutrient use efficiency and yield can be increased by application of nutrients based on quantitative approaches. We calibrated the quantitative evaluation of fertility of tropical soils (QUEFTS) model for the estimation of NPK requirements for different targeted yields of potato. Published data sets were used to calibrate the model. The results of the study showed that to produce one ton of potato tubers, 18, 4, and 24kg N, P, and K, respectively, would be needed with internal efficiencies of 55, 285, and 42kg tuber dry yield/kg N, P, and K removed. The observed yields of potato with different amount of nutrients were in agreement with the values predicted by the model. Therefore, the QUEFTS model based NPK fertilizer recommendations can be adopted for site-specific nutrient management of potato.
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