(1) Seed germination and emergence stage
The radicle first protrudes from the micropyle of the ovule. When the radicle is elongated to the same length as the seed, it is called germination. Hypocotyl elongates, seed coat falls off, and cotyledons are exposed to the soil surface with the elongation of hypocotyl. When cotyledons unfold, they are called seedlings. Suitable conditions, 4-6 days after sowing.
Can germinate. More than half of cotyledons in the field were unearthed at seedling stage.
(2) Seedling stage
The seedling stage is from emergence to flower bud differentiation. After emergence, two leaflets spread out, their young stems continue to elongate, and the upper two opposite simple leaves spread out immediately, which is called single leaf stage. With the elongation of young stems, the first compound leaf is called trilobal stage. In the third leaf stage, the growth rate of aboveground parts is slow, and the underground roots grow faster, forming nodules. At the end of this period, the root system was initially formed and needed more water and nutrients at first. The seedling stage is about 20-25 days, accounting for 1/5 of the whole growth period, which is the long root stage; We should pay attention to squatting seedlings, strengthen field management, achieve integrity, uniformity and strong seedlings, and lay the foundation for high yield.
(3) flower bud differentiation stage
From flower bud differentiation to flower bud differentiation, it is also a branching stage. Generally about 25-30 days. When 4-5 compound leaves appear, the lower part of the main stem begins to branch and differentiate into flower buds at the same time. The bud differentiation and budding of human tofu are carried out under the condition of short-term oral irradiation. The process of flower bud differentiation is as follows: first, a hemispherical flower bud precursor appears, then an event sheet is formed in front of it, and then a conduit is formed; Then divided into keel flap, wing flap and flag flap; The ring-shaped stamen primordium differentiated one after another, and the stamen center began to differentiate pistil, resulting in ovule primordium. Then it enters the ovule and anther primordium to differentiate, the flower organ grows gradually, and finally buds, pollen and embryo sacs are formed one after another, thus completing the flower bud differentiation. The flower buds began to differentiate, and the plants entered the reproductive growth period and the vegetative growth period. At this time, it is necessary to strengthen the management of fertilizer and water, and at the same time pay attention to coordinating vegetative growth and reproductive growth to meet the requirements of strong plants, many branches, many flower buds and healthy flowers.
I hope my answer is helpful to you.