关键词: 苹果, 营养元素, 品种, 砧木, 因素

Abstract: Through sampling and analyzing the app le leaves and conducting fertilization test in Shaanxi province, the effect of samp ling time, cultivars, inter / rootstock, crop level and fertilization on nutrient content in apple leaves was discussed. The results showed that the nutrient content in apple leaves changes with seasonal grow stage of apple tree significantly. The contents of N, P, Ca, B, Mn, Zn in apple leaves are significantly different in 5 apple cultivars such as Fuji, Qinguan, Starking Delicious, Gold Delicious and Gala. The nutrient contents in app le leaves are different among M9, M26, M7, MM106 interstock and M. sieversii Rome rootstock, K, Fe contents ofM9 are higher but the others are lower, Mg , Mn, Zn contents of M26 are higher but K, Fe are lower, N, P, Cu, Fe, Zn contents of M7 are higher, N, Mn contents of
MM106 are higher but K is lower, Fe content of M. sieversii Rome rootstock is higher but Cu, Zn are lower. The nutrient contents of different crop level orchards are different, the N, Mg, Zn contents of high-crop level
orchards are higher but P, K are lower than those of low-crop level orchards. The K content in the apple
leaves can be increased significantly by fertilization than N and P.

Key words: Apple, Nutrient element, Cultivar, Rootstock, Factor