Author : Muhammad Amin Ishak

Summary : The effect of different growth regulators (GA(subscript 3) 250 ppm, IBA 50 ppm, 100 ppm, 300 ppm, NAA 50 ppm, 100 ppm, 300 ppm, Vitamin A (subscript 1) 2 ppm, Hormex 3 ppm), nutrients (nitrogen, boron, and calcium) and growing media (sand, sandy loam, perlite, garden soil mixed with sand and chicken manure) on the growth of mangosteen seedling were studied at the Fruit Crops Orchard of the Department of Horticulture, University of the Philippines Los Ba¤os (UPLB) from June to December 1979. Important characters such as plant height, stem diameter, leaf area, anatomic condition of roots and cambium, root lenght, and protein content of the plant leaf were analyzed. Among growth regulators, nutrients, and media tested, the combination of GA(subscript 3) and Vitamin B1 with IBA, NAA, and high ratio of nitrogen, calcium and boron increased vegetative growth. Media consisting of perlite and mixture of sand, garden soil, and chicken manure had similar promotion effect on vegetative growth. Under sand culture, GA (subscript 3) (250 ppm) + IBA 100 ppm) + NAA (100 ppm) + Vitamin B1 (2 ppm) increased plant height, stem diameter, and stimulated cambium activity. Hormex (3 ppm) increased the leaf area. Mixture of GA (subscript 3) (250 ppm) and Vitamin B (subscript 1) gave the highest protein content. It also increased root length, and maturation and elongation zones. In terms of the effect of medium, GA (subscript 3), NAA, IBA, and Vitamin B (subscript 1), combined with mixture of sand, garden soil and chicken manure, resulted in a good seedling growth. Perlite was best in terms of plant height, root length, and maturation zone. On the other hand, sand, soil and chicken manure resulted in highest stem diameter, leaf area, pretein content, and root zone elongation.