Field experiment was conducted on the alluvial soils of Jalandhar during 1992–93 and 1993–94 to work out the strategy for efficient management of N in potato-wheat-maize system. For this potato was fertilized with different sources of N while succeeding crops of wheat and maize were fertilized with urea only. Application of N did not affect the emergence of any crop. Ammonium sulphate, ammonium chloride and CAN applied to potato at planting were superior to urea in increasing tuber yield due to increased N, P and Mn concentration while urea maintained high concentration of Fe in the potato leaves. Ammonium chloride applied at planting did not affect the dry matter content of tubers but affected it when applied at earthing up. Other sources of N had no effect on the dry matter of tubers. The N applied to potato at 200 kg N/ha showed significant residual effect on the yields of succeeding wheat and maize crops each raised with 40 kg N/ha. The application of ammonium chloride at planting supplemented with urea at earthing up was more effective than urea alone in its direct effect on potato as well as residual effect on wheat and maize yields.
