In this study, two factors and three levels of foliar fertilizer spraying with different ratios of N/K test were used to provide references for rational fertilizer application in apple production.In this experiment, urea and potassium chloride were used to spray fertilizer on the leaves of 7A green red Fuji apple. Two factors of urea (C) and potassium chloride (K) and three levels were used were set for urea and potassium chloride respectively. A total of nine treatments and three repeated treatments were set, and related indexes of leaves and fruits were determined. Leaf nitrogen and potash fertilizer could promote the fruit yield, fruit weight, fruit shape index.Leaf nitrogen increased fruit titratable acid content, leaf potassium application affected the fruit hardness, colour and lustre, soluble solids; When spraying of nitrogen concentration was less than or equal to 2.5 g·L-2, the application of potassium fertilizer concentration was greater than 1.82 g·L-2, the quality and yield of apple increased with increase of application of potassium fertilizer;When the spraying of nitrogen concentration was greater than 2.5 g·L-2 and less than 5 g·L-2, the application of potassium fertilizer concentration was greater than 1.82 g·L-2 and less than 5 g·L-2 , and the growth of apple leaves was inhibited, the quality of apple fruit was increased. Spraying of proper concentration of nitrogen fertilizer and potassium fertilizer can promote the yield and quality of apple, but high concentration will have negative effect. |