Review on response to site specific nutrient management in rice-blackgram sequence

Abstract

Rice (Oryza sativa L.) is the dominant cereal crop in many developing and Asian countries and is a staple food for more than half of the world population. Rice is a staple food crop not only in India but also for entire South Asia. Managing the location specific variability in nutrient supply is key strategy to overcome the current mismatch of fertilizer rates and crop nutrient demand in irrigated rice environments. Soil test based application of plant nutrient helps to realize higher response ratio and benefit- cost ratio as the nutrients are applied in proportion to the magnitude of the deficiency of a particular nutrient and the correction of the nutrients imbalance in soil helps to harness the synergetic effects of balanced fertilization. Location specific fertilizer recommendations are possible for soils of varying fertility, resource conditions of farmers and levels of targeted yield for similar soil classes and environment. Field specific balanced amounts of N, P, K could be prescribed based on crop estimates of the indigenous supply of N, P, K and by modelling the expected yield response as a function of nutrient management.