Effects of Various Soil Moisture Regimes and Different Levels of Nitrogen and Spacing on Potato (Solanum Tuberosum L.)*

Potato variety Kufri Sindhuri was observed to be highly responsive to N applications upto 180 kg N/ha and maintenance of available soil moisture (ASM) regime at 80 per cent measured from surface 15 cm soil depths. Inspite of the highest gross tuber-yields at 40 cm x 20 cm spacings, a spacing of 50 cm x 20 cm equivalent to 1,00,000 plants/ha was advocated in order to balance the high gross tuber-yields with bigger-size ware-grade tubers. The consumptive-use (CU) of water at best regime of 80 per cent ASM was 33.6 cm achieved through 12 irrigations. The irrigation-requirement at this regime was 9.37 q/cm of water applied. The CU at I₀ was respectively greater by 2.0 cm, 3.7. cm than those at I₁ and I₂. But the corresponding reductions in yield were 33 and 59 q/ha. The N-uptake was of the order of 228, 233 and 299 q/ha at I₀, N₂ and S₀ levels respectively.