AN EXPERIMENTAL STUDY ON THE REJUVENATING AGED MANGO TREES IN DAQIAOTOU MANGO PLANTATION, JINGGU

In order to rejuvenate aged mango trees with low output and nearly obsoletation, an experiment was carried out in Daqiaotou mango plantation, Jinggu County, which could provided some scientific data for rejuvenating thousands of aged Mango trees in Jinggu County.Since the fruits of aged mango trees were collected, four kinds of experiment modes, namely strongly rejUvenating, lightly rejUvenating, rejUvenating one every two rows of aged mango trees and lightly pruning, were carried out in the aged mango plantation with a area of 10 hm2 totally including 2064 aged mango trees. An adjunt to the above experiments, some agricultural technological measures, such as preventing diseases and eliminating pests, changing slope-land into tableland, increasing fertilizer, etc., were taken. After aged mango plantation rejuvenation in 1991, 1110 of 2064 mango trees recovered to live, and their output reached up to 44 360 kg in 1993, which is 10 times of that in 1991 and 21 .65 times of average output of three years of 1989, 1990 and 1991. The experimental results indicated that all of these four rejuvenation modes were valuable to increase the output of the aged mango trees, and their effects were ranked as follows; lightly rejuvenating rejuvenating one of every two rows of aged mango trees lightly pruning. After grafting for two years, the mango trees strongly rejUvenated started to set fruits.