Abstract:

To study nutrition characteristic and directions of fruit-bearing tree of Citrus microcarpa in Yunan, Guangdong. The two types of the citrus orchard grew on paddy fields and hillside soil were selected to determine the element content of leaves, trunk and fruit samples collected in the different growth stages, to analyze the seasonal dynamics and the proportion of each element demand, to put forward the suitable nutrient directions for the growth of Citrus. The results showed that: (1) the highest demand for P for all growth stages was in the flowering stage; K demand was the highest between in the flowering stage and in the young fruit stage; Ca and Cu demand was the lowest in flowering period, increased gradually after the flowering period, and, the highest in the maturity period; Mg, Zn, Fe, Mn, B demand were slightly lower in flowering period compared with the other growth stages, but was relatively stable demand for all growth stages. (2) The content of N, P, K, and of Ca, Mg element in the trunk of Citrus. In the paddy soil was generally higher than those in the hillside soil; the content of Cu, Zn, B in the former was less than those in the latter, while the Fe, Mn content was the opposite trend. (3) According to the data analysis of multiple orchards, 1 ton of ‘Shatangju’ fruit produced need to N 1.242 kg, P 0.138 kg, K 1.366 kg, Ca 0.476 kg, Mg 0.126 kg, Fe 0.72 g, Mn 0.97 g, Cu 2.47 g, Zn 1.58 g, B 1.34 g; According to fertilizer utilization and the proportion of NPK fertilizer, N 12.95-15.11 kg, P2O5 7.77-9.1 kg, K2O 12.95-15.11 kg should be applied throughout the year if the yield of 1 ton of citrus was obtained.