The fertilizer application practices indicated the possibility of enhancing the production potentials of carrot. So far Soil Test Crop Response correlation studies under IPNS have not been made on carrot in Tamil Nadu and moreover in Nilgris, coming under hilly zone, which constitutes major area under carrot. In order to develop a scientific base for prescribing fertilizer recommendations for carrot, the field trial was conducted at the Horticultural Research Station, Nanjanad farm Ooty. To create different fertility gradients, a gradient crop of Chakravarthi keerai var Ooty1 was raised in Ooty soil series ( Ultic Hapludalf ). After the creation of fertility gradients in the experimental site, the test crop experiment was conducted with carrot hybrid Kuroda Super comprising of five levels of N (0,50,100,150 and 200 kg ha-1), four levels of P2O5 (0,50,100 and 150 kg ha-1) and four levels of K2O (0,50, 100 and 150 kg ha-1). From the crop yield, uptake data and soil test values, the basic parameters viz., Nutrient Requirement (NR), soil efficiency (Cs) fertilizer efficiency (Cf) and organic efficiencies viz., Co(SM), Co(SM+AZO) were computed. From these basic parameters the fertilizer adjustment equations for prescribing fertilizer doses for inorganic alone as well as IPNS were developed for carrot. The profound yield increase recorded in the present study could be attributed to the efficient utilization of fertilizer nutrients and conducive soil fertility status under IPNS.