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一、小麦的春季生育特点黄淮平原区春季气温一般在2月中旬(少数年份在2月上旬)明显转暖,随着气温的回升,小麦开始返青,陆续进入起身、拔节和孕穗等生育时期。一般把小麦从返青到孕穗阶段称为小麦生育中期,这是小麦营养生长和生殖生长并进阶段,由于小麦的营养器官和生殖器官同时加速生长并建成,因此,又称为器官建成阶段。在此阶段,小麦群体和个体发展很快,根、茎、叶生长达到盛期,每亩群体数量达到高峰,分蘗进行两极分化;成穗数趋于稳定,中上部叶片出生和形
First, the characteristics of the spring wheat breeding Huanghuai plain spring temperatures generally in mid-February (a few years in early February) was significantly warmer, with the temperature rise, wheat began to turn green, one after another into the stage, jointing and booting stage and other reproductive period . Wheat is generally referred to as the middle stage of wheat growth from rejuvenation to booting stage, which is the vegetative and reproductive growth stage of wheat. Since the vegetative organs and reproductive organs of wheat accelerate and grow at the same time and are built, they are also called organogenesis stage. At this stage, the wheat population and individual developed very fast, the growth of roots, stems and leaves reached the peak, the population per acre peaked and the tillers were polarized. The number of spikelets tended to be stable, and the emergence and shape of mid-upper leaves