STUDY ON THE EFFECT OF BASAL FERTILIZATION AND PLANTING METHODS ON THE GROWTH AND DEVELOPMENT OF Michelia tonkinensis A.Chev IN CAO BANG PROVINCE

Abstract

Michelia tonkinensis A.Chev is a valuable multi-purpose tree species widely distributed from the Northwest to the Central Highlands. Research results showed that fertilizer does not greatly affect the survival rate of the species, at around 96.67 - 98.33% (6 months old) to 91.25% (18 months old). However, after 18 months of planting, fertilizer had a clear effect on plant growth. Formula 1 (basal application of 5 kg of decomposed manure/hole) gives the largest growth in root diameter reaching an average of 2.82 cm. Formula 1 (basal application of 5 kg of decomposed manure/hole) also gives the largest growth in height of 2.67 m and the largest growth in canopy diameter of 1.47 m. The agroforestry planting method had a better survival and growth rate than monoculture planting. After 18 months of planting, the survival rate, root diameter, crown height and canopy diameter of the agroforestry model were 90.22%, 2.99 cm, 2.79 m, 1.57 m, respectively compared to that of monoculture model at 88.89%, 2.81 cm, 2.64 m, 1.45 m, respectively. Through monitoring and evaluation, it was shown that the growth indicators of the Michelia tonkinensis A.Chev planted in the agroforestry model initially grew better than those in the monoculture model.