Nitrogen, Phosphorus and Potassium Index Systems of Cabbage in Gutian Mountain Area

In order to understand the application effects of nitrogen (N), phosphorus (P) and potassium (K) on cabbage in Gutian mountain area and establish cabbage soil fertility indicators, nine groups of cabbage3414fertilizer experiment were conducted. The results showed that: Under the existing soil fertility levels, applying N, P and K fertilizers was the major measure to improve the yield of Chinese cabbage and increase the economic benefit in Gutian. Applying N, P and K fertilizers increased the average yields by 37.1%, 11.5% and 17.4%, respectively; Applying 1 kg N, P and K fertilizers increased the economic benefit by 186.6, 145.2, 109.4 Yuan. The input-output ratios of N, P2O5, K2O were 35.9:1, 26.9:1 and 20.3:1, respectively. The cabbage low soil fertility levels of N, P and K nutrient contents were critical index 131.4 mg/kg, 8.9 mg/kg and 59.9 mg/kg and the high fertility levels of the soil N, P and K nutrient contents were 189.9 mg/kg, 43.4 mg/kg and 159.4 mg/kg. The highest average yields with applying N, P and K fertilizers were (231.01 69.95), (56.59 34.09), (198.7 40.63) kg/hm2; The optimum economic yields were (222.13 64.28), (52.69 30.97), (188.55 33.27) kg/hm2. The study provides a scientific basis for local cabbage soil fertilization.