Indole butyric acid 4000ppm enhanced rooting on air layering in plum when temperature and humidity is high (25-35"c, 80-90 rh, than lower temp and humidity. What is the reason behind this happening?
As general rule is that lower temperatue always ceases many more activities of the most of the biological activities. for better germination at least up to emergence there shouled be good combination of temp. air and mositure ant that is available there.
Generally better rooting and growth required a combination of optimum temperature, air and moisture. At lower temperature, cell division, enlargement and multiplication which depends on the formation on the cell organelles through breakdown of food materials to amino acid through bi-chemical reaction (alpha amylase activity). These reactions are usually slower at low temperature due to coagulation of materials and extreme high temperature due to loss of respiratory energy. Thus increasing temperature increase cell division as well as rooting in plum up to certain level (30°C) then decline. The optimum temperature for tropical plum layering found better at 25-30°C temperature with IBA application with high RH ( >80%).
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