麦子从以营养生长为主到营养生长和生殖生长并重,这个阶段要掌握早春青,拔节黄,争大穗。麦子经过越冬阶段的缓慢生长时期,为春后加快生长奠定了基础:一是长成了比较发达的根系,一般十一月初播种的稻板小麦,到小寒节(5叶龄)次生根已有4.5条,根系密集层9.2厘米,其中最深的根达到土层82厘米;二是糖分积累,可溶性糖含量达到15％左右,这是麦子一生中含糖量最高的 Wheat from vegetative growth to vegetative and reproductive growth, both at this stage to grasp the early spring green, jointing yellow, big spike. After the winter growth stage of the wheat slow growth period, to accelerate the growth of spring laid the foundation: First, grow into a more developed root system, usually planted in early November rice, to the small root (5 leaf age) secondary roots have 4.5, dense root 9.2 cm, of which the deepest roots reached 82 cm soil layer; the second is the accumulation of sugar, soluble sugar content of about 15%, which is the highest sugar content of wheat in life