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A field experiment was conducted on mustard-chicory mixed cropping with three rates of chemical fertilizer application i. e. recommended (80 kg N, 30 kg P2O5 and 15 kg S/ha), 125% of recommended and 150% of recommended dose of fertilizers at the Regional Research Station, Bawal of CCS Haryana Agricultural University, Hisar (India). Three rates of nitrogen (0, 20 and 40 kg N/ha) were also applied to chicory after harvesting of mustard. The results of these studies revealed that 150% of recommended dose of fertilizers resulted in maximum grain and straw yields of mustard crop. These increments were relatively higher by increasing the dose of fertilizers from 100 to 125% than from 125 to 150% of recommended doses of fertilizers. The grain and straw yields of chicory increased consistently with increasing doses of chemical fertilizers and top dressing of nitrogen in chicory after harvest of mustard. However, these improvements in grain yield of chicory were not significant between top dressing of 20 and 40 kg N/ha over different levels of fertilizer application to mixed population of mustard+chicory during two seasons. The integrated use of chemical fertilizers significantly improved the oil content in seeds of mustard and protein content in the seeds of chicory as well as organic carbon content of soil after two seasons of their application. Therefore, for sustaining higher productivity and quality of produce as well as good soil health, the integrated application of NPS mixtures of chemical fertilizers is essential in mustard-chicory mixed cropping system under semi-arid condition of North India.