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一、采种根据苏联和我国群众的经验,种子的采集期愈接近成熟期,种子的品质愈好,发芽率也愈高,过早采集的种子发芽率仅为10%,而接近成熟期时(在生理成熟之后,接近形态成熟之时)采集的种子发芽率约为88%。再从果实外部来看,桦树果实成熟时,花序轴呈黄色,花序轴一弯曲就断折(成熟时序轴干脆),从种子内部来看,用小刀切开时,胚乳浓度大,也就是定了浆时,正是采种适期。
First, the seed According to the experience of the Soviet Union and our masses, the closer the seed collection period to maturity, the better the quality of the seed, germination rate is higher, premature seed germination rate of only 10%, and close to maturity ( After physiological maturity, near the time of maturity), the seed germination rate was about 88%. From the outside of the fruit, when the birch fruit is mature, the inflorescence axis is yellow, and the inflorescence axis is bent off (the ripe timing axis is crisp). From the inside of the seed, when the lancet is cut open, the endosperm concentration is large Given the pulp, it is the appropriate period of mining.