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在播种前,测定种子的发芽率,对确定适宜的播种量、保证全苗、创造合理的群体结构、保证作物增产都有重要意义。种子萌发时,胚根鞘首先突破种子,长出种子根。接着胚芽鞘也突破种皮。当种子根长到种子长度的一半时,表示萌发的开始,胚芽鞘长到种子长度的一半时,表示种子完全萌发。这便是测定种子发芽率的记载标准和时机。测定发芽率时要每天观察记载已萌发的种子数。开始测定的3—4天内,种子萌发的
Before sowing, the determination of seed germination rate, to determine the appropriate sowing volume, to ensure the whole seedlings, to create a reasonable population structure, to ensure that crop yield are of great significance. When the seeds germinate, radicle sheath first break through the seeds, grow seed roots. Then coleoptile also broke the seed coat. When the seed root is half the length of the seed, it indicates the beginning of germination and when the cob sheath is half the length of the seed, it indicates that the seed germinates completely. This is the determination of seed germination rate record standard and timing. Determination of germination rate should be observed daily record has been the germination of the number of seeds. The seeds germinated within 3-4 days of starting the assay