Effects of irrigation scheduling methods and blended NPS fertilizer on tuber yield and water productivity of potato (Solanum tuberosum L.) in northwest Ethiopia

Irrigation water scheduling methods influence the growth, yield, and productivity of crops including potatoes. Therefore, a study was conducted to evaluate effects irrigation frequency determination on tuber fertilizer use efficiency potatoes at Koga scheme, in Northwest Ethiopia. The treatments were consisted two (wetting front detector crop requirement) six NPS rates (0, 90.8, 136.2, 181.6, 227.4 272.0 kg ha−1, which factorial combined randomized complete block design with three replications. Growth yield data potato collected based standard procedure. productivity, partial factor agronomic calculated using their respective models. analyzed SAS version 9.4. results revealed that wetting method recorded highest weight (79.5 g), (41.9 t ha−1), (9.1 m−3 water) compared requirement method. rate 272 ha−1 also produced (86.5), (58.1 ha−1) (12.4 water). Treatment combination plant height (64.m cm) stem number (10.4). Wetting (275.2 per NPS) requirement. generally higher gave net benefit (236,591.7 ETB acceptable marginal return (248.9%), is recommended for economical production area.