Changes in Cytokinin-like Substances in Stem Apex prior to Flowering of Lychee cv. Hong Huay

Abstract

Changes in cytokinin-like substances in stem apex prior to flowering of lychee cv. Hong-Huay were studied on twenty years old lychee trees at Suan Song Sand orchard, Doipui, Chaingmai, Thailand. The work was carried out between December 1995 and November 1996 with Completely Randomized Design and 8 replications. The treatment was number of weeks 0,2,4,6 and 8 prior to flowering. It was found that quantity of cytokinin-like substances in the 8^th week was low. It was constant until the 6^th week The increment was found in the 4^th week and rose to the maximum in the 2^nd week and constant until flower emergence.