Optimization of fertilizer doses for desired yield targets of hybrid brinjal under IPNS by targeted yield model

Managing soil fertility is crucial in increasing crop productivity and improving nutritional security, while maintaining soil health and environmental quality. Fertilizer use play a key role to mitigate nutrient mining in soil and therefore, usage of Fertilizer inputs should be based on crop response to applied nutrients for various soil types. At this moment, Soil Test Crop Response based Integrated Plant Nutrition System (STCR-IPNS) has got a predominant role in managing demand driven nutrient supply to crops for enhanced yield, Fertilizer use efficiency and profitability to farmers. Nomograms for a range of soil test values under NPK alone and under IPNS for the desired yield target of hybrid brinjal are formulated using the above FPEs. When Fertilizer N, P2O5 and K2O was applied along with FYM @ 25 t ha-1, the extent of saving was 72, 40 and 58 kg of Fertilizer N, P2O5 and K2O, respectively for hybrid brinjal resulting in economy of Fertilizer use under IPNS. Using nomograms, critical soil test values for available N, P and K were fixed for varying yield targets both under NPK alone and IPNS.