Studies on the Techniques of Euphorbio pulcherrima Propagation by Semi-hardwood Cutting

The techniques of Euphorbio pulcherrima propagation by branch cuttng were studied in the paper.The results showed that:①The rooting percentage and survival rate of semi hardwood cutting were obviously higher than that of hardwood cutting.②Rooting percentage was only 8.7% with entire leaves removing from cuttings.Remaining one second leaves in the middle part of the cutting, however, was suitable for rooting.③Rooting capacity was significantly improved by the treatment of NAA and IBA with the concentration of 300×10^-6, 500×10^-6 respectively, but the combination of the two kind of plant hormone would be better.④Cutting treatment with Dacomil promoted root formation, but Bavistin treatment reduced rooting capacity.⑤The natural light intensity should keep at 40% in 12d after cuttage, and then increased to 85%.⑥The best media for cuttage was the mixture of equal red soil, humus and coal cinder.⑦Putting cuttings into water for 2h before cuttage could improve rooting because the cuttings absorbed enough water and cleaned the white juice on the cut.