Status of Mineral Nutrition of Litchi chinensis and Effect of Chemicals on Controlling its Nutrition Condition

This paper reviewed the nutrition condition and its dynamic transportation of Litchi chi-nensis Sonn., the controlling effect of chemicals on the mineral nutrition of litchi tree, The results showed that, the flutuation range of mineral nutrition content in Litchi chinensis Sonn. was rather wide, and appeared a seasonal variation, which showed to be related to the flowering, fruit-growing and branch building periods in all the year. The nutrient level of tree body directly affected the fruit yield.N, K contents in leaves before the flowering, P content during and after flowering peri-ods were signi ficantly related to the yield structure. The highest N,P, K contents were found in flowering organ, the flowering consumed large amount of nutrition, which served the main reason of the rapid decrease of N,P, K contents during and after the flowering period. The nutrient con-tents containing in flowering organ and leaves were significantly related to the flower constructure, and directly affected the flower quantity and quality, espetially the proportion of male and female flowers. Chemical agents directly affected the mineral nutrition level in tree body, espetially the N,P contents in flowering organ.