Research Of Floral Formation And Physiological Changes Induced By Potassium Chlorate Application On Heavily Pruning Longan And Potted Longan

Shixia longan (Dimocarpus longan Lour.) trees that had been heavily pruned were tested in the first trial, which were treated with potassium chlorate (KClO₃) of different dosages: 0.5kg/tree (Treatment A), 1.0 kg/ tree (Treatment B) and 1.5kg/ tree (Treatment C). The aim was to study effects of floral formation and some physiological as well as bio-chemical substances in leaves, which included soluble protein, nucleic acid, carbohydrates, nitrogen, phosphorous, potassium and nitrate reductase, so as to explore mechanism of off-season floral formation induced by potassium chlorate application in longan.2 years old potted trees of Shixia longan were tested in the second trial, which were treated with different concentration of potassium chlorate from 0～0.35 g/kg (soil dry weight base, the same that following) . The aim was to study stimulative intensity on growth in response to different concentration, as well as effects of gas exchange and chlorophyll fluorescence parameters. So as to establish an evaluative system that can be used to fast evaluate stimulative intensity affected by potassium chlorate application on longan and to forecast the effect of floral formation. Results were showed as following:1. Percentage of flowering trees of treatment A, B, C was 50%, 66.7 %and 66.7% respectively 127 to 140 days after treatment. Percentage of...