Investigation The Effects of Thidiazouron and Humic acid on Postharvest Life of Cut Alstroemeria aurantifolia cv. " Konyambe "

Two separated experiments were conducted to evaluate the effects of different concentrations of thidiazouron (10, 20, 30, 40 and 50 μM) and humic acid (1, 10, 100, 1000 and 10000 ppm) on vase life of cut Alstroemria flowers. Experiments were carried out based on completely randomized design with 8 replications in postharvest laboratory of Horticultural Department, Mohaghegh Ardabili University in 2009. The results showed that lower concentrations of humic acid had positive effects on flower vase life, water content of tissue and solution uptake, while didn’t affect relative fresh mass and leaf chlorophyll content. In both experiments results also indicated that humic acid in higher concentrations affected all traits, negatively. Howewer, this compound at 10000 ppmdecreased flower vase life, water content, relative fresh mass, solution uptake and chlorophyll content. By increasing the humic acid concentration up to 100 ppm the vase life of cut flowers improved. Compared with control and other treatments, 1000 ppm of humic acid decreased flower vase life, considerably. The highest vase life of flowers devoted to 10 μm of TDZ, however higher concentrations of this compound reduced flowers vase life. Moreover, the highest solution uptake and leaf chlorophyll content obtained by 30 μm TDZ, while the highest relative fresh mass devoted to 40 μm of this compound.