Interactive Effects of Nitrogen Application and Irrigation on Water Use, Growth and Tuber Yield of Potato under Subsurface Drip Irrigation

Potatoes are a high-value crop with shallow root system and high fertilizer requirements. The primary emphasis in potato production is minimizing nitrogen-leaching losses from the zone through fertigation. Therefore, field experiment was conducted for two consecutive years, 2018–2019 2019–2020 to assess effect of nitrogen irrigation amount frequency on tuber yield, water balance components productivity potatoes under surface subsurface drip irrigation. laid out split-plot design three levels (187.5 kg N ha−1 (N1), 150 (N2) 112.5 (N3)) main plots six (drip lines were at 20 cm depth) one subplots. Irrigation scheduling based 100% cumulative pan evaporation an alternate (I1) two-day interval (I2), 80% (I3) (I4), 60% (I5) (I6) days (I7). Our results showed that transpiration higher N1 N2 compared N3, while soil N3 over N2. regimes I5 I6 had lower than I1, I2, I3 I7, I7 more I2 I3. Leaf area index (LAI), dry matter accumulation (DMA), mass density (RMD) yield par but significantly N3. LAI DMA statistically recommended Tuber saved 20% I1 I2. On other hand, real (WPET) comparable I4 practice (I7) as pooled evapotranspiration (ET) (E) 19.5 20.6 mm higher, respectively, Among interactive treatment combinations, N1I1, N1I2, N1I3, N1I7, N2I1, N2I2 N2I3 recorded highest yields without any significant differences among them. Treatment all combinations. Water