Why is it necessary to dry rice before sowing?
Drying rice seeds before sowing can effectively improve the germination rate and germination potential of seeds, the main reasons are:
1. Seed drying can promote the ripening of seeds and improve the activity of enzymes. After harvest, although rice seeds are dried and cleaned before entering the warehouse, due to different maturity and dryness, the air humidity and temperature will also change during storage. if the seeds absorb moisture, the respiration is exuberant, and the nutrients in the seeds are consumed more, it often leads to the weakening of seed germination ability and germination potential, which can enhance the passing of seed coat, make it absorb water evenly during seed soaking, and improve the activity of enzyme.
2. Seed drying can promote oxygen into the inside of the seed, and free oxygen is needed for seed germination. Oxygen is the first condition for seed embryo to form gibberellin or to transform bound gibberellin into free gibberellin. Gibberellin can induce the formation of a-amylase and catalyze the degradation of starch into soluble sugars for seed embryo respiration and the formation of new cells in young roots and buds.
3. Seed drying can reduce the concentration of endamine A, amine B, abscisic acid and vanillic acid. When the concentration of these substances is high, it can inhibit germination.
4. The short-wave light in the solar spectrum, such as ultraviolet light, has germicidal ability, so drying seeds has a certain germicidal effect.
The method of drying the seeds: spread the seeds thinly on the mattress or on the cement floor, bask in the sun for 2 days and turn them frequently to make the seeds dry in the same way.
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Three key periods should be paid attention to in planting rice film and raising seedlings.
According to many years' practical experience, I think that the technology of raising rice seedlings with thin film should pay attention to three key periods: closed period, refining seedling stage and film opening stage. The first period: the closed period, that is, from sowing to the stage of one leaf and one heart. During this period, the film should be tightly closed and created.
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Key points of cultivation techniques of dry cultivation and sparse planting of planting Rice
According to the characteristics of high yield, the cultivation technique of dry cultivation and sparse planting of rice is based on the application of comprehensive cultivation techniques to promote rice to achieve strong seedlings, strong plants, long ears, full ears, many grains and full grains in the process of growth and development, and finally achieve high yield, low consumption and high efficiency.
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