种子的成熟有两个阶段。一是生理成熟(具有发芽能力),一是形态成熟(外观成熟)。但在多数情况下,达到生理成熟的种子内部营养物质是乳状,仍处于易溶状态,干物质积累尚不充分,种子含水量很高,种皮不够致密,保护性能不好,这样的种子不适于贮藏和播种。如果把它采集下来,经过干燥失水后,则种仁干瘪,发芽率 Seed maturation has two stages. First, the physiological maturity (with germination ability), one is mature (appearance mature). In most cases, however, the physiologically mature seeds are milky in their internal nutrients, are still soluble, have inadequate accumulation of dry matter, high seed moisture content, poor seed coat, poor protection, For storage and sowing. If it is collected, after drying loss of water, the kernels shriveled, germination rate