BÀI 3

Abstract

Nut eating michelia, Michelia tonkinensis A. Chev, is multi - purpose tree, in addition to the value for timber used in house construction and furniture making, presents the results of research on cutting - propagation of Michelia tonkinensis A. Chev at Xuan Lien Nature Reserve, Thanh Hoa province. The research results confirmed that growth regulators and cutting substrate materials have significant effect on the root forming ratio and quality of cutting roots. Cuttings without phytohoormone treatment will die within 20 - 30 days. Cuttings treated by 200 ppm IAA growth regulators, 100 - 150 pp IBA and 250 ppm NAA
reached rate of buds and root forming greater than 50%. The mix of 50% gold sand + 50% coconut fiber, in combination with IBA concentration of 150 ppm, made the highest quantity and quality of cuttings, the ratio of live cuttings is 96%, the ratio of root - forming cuttings was 88% and the index of root forming was 31.7%, shoot forming ratio was 88.9%. The success of this study contributes significantly to the research of improvement of Michelia tonkinensis A. Chev species in paricular, and of forest tree in genaral.