南方生长季长,一年可种双季稻或三季稻。北方能不能一年也种两季小麦?过去试验都没有成功。因为受了李森科阶段发育春化理论的影响,认为小麦都需要一个低温春化阶段,夏天种温度高不能拔节抽穗。要种也得把萌动的种子,先在冰箱里进行低温春化处理,才能播种。虽然有些能够抽穗成熟,但因温度高,生长发育快,干物质积累少,产量很低。而且只在现有冬小麦或春小麦品种中进行筛选,不能完全适应从高温到低温的特殊气候条件。所 Long growing season in the south, one year can be planted double or triple crop rice. Can the North plant two seasons of wheat a year? In the past, the trials were unsuccessful. Because of the Lysenko stage development of vernalization theory, that wheat needs a low temperature vernalization stage, summer high temperature can not jointing and heading. To have kind of germinated seeds, first in the refrigerator for low temperature vernalization in order to sow. Although some of them can be heading mature, they have low production due to high temperature, fast growth and development, little accumulation of dry matter. And only in the existing winter wheat or spring wheat varieties to be screened, can not fully adapt to the special high temperature to low temperature climatic conditions. The