脱叶处理对牡丹秋季露地二次开花的影响

该文以4个重要的秋发牡丹品种为试材，研究了脱叶处理对牡丹秋季露地二次萌芽、开花的影响.结果表明:全株脱叶是实现牡丹二次开花的关键措施，在山东菏泽地区以8月下旬至9月上旬为适宜的脱叶时间，脱落酸（ABA）、乙烯利等化学脱叶药剂处理使秋发1、2、3号品种的二次开花时间提前2～6 d，显著提高了植株二次开花质量，尤其是明显促进了二次叶片的发育.试验证明，在完善的花芽分化基础上，综合掌握植株脱叶关键措施，可使秋发牡丹于秋季特别是在国庆节前后开放，并且达到花叶并茂的效果. 

Effects of defoliation on the autumn-reflowering of field-grown tree peonies

The effects of defoliation on the reflowering of four important autumn flowering cultivars of tree peony (Paeonia suffruticosa) that growing under field conditions were studied. Results indicated that full defoliation was the key measure to autumn reflowering, and from late August to early September was the optimum defoliation time in Heze, Shandong Province. Chemical defoliators like abscisic acid(ABA) and ethephon could advance the flowering time of three autumn flowering cultivars 2-6 days, and had a better effect on the reflowering quality and leaf development than artificial defoliation. The experiment also demonstrated that proper defoliation treatment after differentiation of the floral buds could induce tree peony to blossom in autumn, especially around 1st October, the National Day of China.