Abstract:

In order to realize scientific fertilization and achieve successive high and stable yield, we investigated changes in main mineral elements (N, P, K, Ca, Mg, Fe, Zn, Mn) in leaves and fruits (kernel, shuck, shell) and weight in different organs of fruits during the kernel-filling period of "Lüling" walnut, an early-fruiting variety. The results showed that: nut and kernel weight, as well as gross fat and total protein in the kernel increased by 5.91 g(51.39%), 5.53 g(73.47%), 4.24 g(80.99%), 1.02 g(69.24%) respectively during the kernel-filling period. N, K, Fe and Mn contents in the leaves had a decreasing tendency, P, Mg, and Zn contents had an increase trend, and Ca content decreased at the early stage and then increased. In the kernel, N, P, K, Ca, Mg, Fe, Zn and Mn contents had a decreasing tendency, while their gross had an increasing tendency. In the shuck, P, Fe and Mn contents had a decreasing tendency, while K, Ca, Mg and Zn increased at the early stage and then decreased. In the shell, N, P and Zn contents showed decreasing tendency, K content increased at the early stage and then decreased, Ca and Mg content increased gradually, and Fe and Mn had no significant change. The gross of fat in the kernel was significantly and positively correlated with the gross of N, P, Fe, Mn, Zn in the kernel, and significantly and negatively with the contents of N, K, Mn in the leaves, the contents of N in the shuck, and the contents of P, Zn in the shell. There existed significant negative correlations between the gross of fat in the kernel and the contents of P, Fe, Mn in the shuck, and between the gross of fat in the kernel and the contents of N in the shell.

Key words: ", Lü, ling", walnut, kernel-filling period, leaf, fruit, mineral elements