Maize Straw Return and Nitrogen Rate Effects on Potato (Solanum tuberosum L.) Performance and Soil Physicochemical Characteristics in Northwest China

The average yield of fresh potato tubers per hectare is relatively low in China, partly due to poor nutrient management. Chronic inorganic N enrichment leads soil acidification, which deteriorates fertility. Straw residues are removed from the field or burnt during land preparation, resulting depletion and air pollution. However, these can be returned improve its Therefore, a two–year experiment was conducted an existing with five years different nitrogen (N) rate determine effects straw return on growth, tuber yield, quality, profit margin, physicochemical properties. consisted four rates: 0 (control, CK), 75 (low rate, LN), 150 (medium MN), 300 (high HN) kg ha?1 without (9 t ha?1) return. results showed that improved fertility, increased quality. Compared control, MN + treatment stimulated economic (34.73% 38.34%), margin (55.51% 63.03%), protein content (20.04% 25.46%) 2018 2019, respectively. Nitrogen after sustainable practice for stimulating improving fertility promote agriculture development.