石油价格的不断上涨,给花卉生产者在冬季的生产增加了相当大的成本。为了降低燃油成本而获得最大的利润,他们只能尽量降低温室内的温度,但是,温度降低后对于花卉的生长、发育的影响却少有研究。前几年,美国密歇根州立大学的有关人员开始研究温度和光照对广泛应用的四种花坛花卉 Rising oil prices have added considerable costs to flower producers in winter production. In order to reduce fuel costs and maximize profits, they can only minimize the temperature in the greenhouse, however, the effects of reduced temperature on the growth and development of flowers are rarely studied. A few years ago, the relevant personnel of Michigan State University began to study the temperature and light on the widely used four kinds of flower beds