大豆是典型的自花授粉作物,自然杂交率很低,不需要设置隔离区或采用套袋防杂措施。一般只需采取以下防杂措施。 (一)混合选挥法:在大田生产中,于大豆结荚鼓粒期,初选生长良好、无病虫害、具有本品种典型性的植株,挂牌或插杆标记。成熟时,再复选一次,淘汰劣株、病株,在符合本品种特征的基础上,选择若干形态一致。分枝多、荚多、粒多、粒大的优良单株。将入选的单株分别收获,并按株、荚、粒等性状进行决选并将决选后的单株混合脱粒作种用。选择单株的数量应根据下年度种子田或农户生产田的需要而定。 (二)片选法:在种子田或选择生长发育较好的生产田,进行去杂去劣,将混杂的品种植株或生长发育不良、病虫害严重的劣株拔除,然后全部收获、 Soybean is a typical self-pollinating crop that has a low rate of natural hybridization and does not require the isolation zone or bagging precautionary measures. Generally only need to take the following anti-miscellaneous measures. (A) mixed-election law: in the field of production, in the soybean pod drum grain period, the primaries grow well, no pests and diseases, with the typical species of plants, listing or plug mark. Mature, then check again, out of bad plants, diseased plants, in line with the characteristics of the species based on the selection of a number of forms consistent. Branches and more, more pods, more grain, grain of the fine single plant. The selected individual plants were harvested, and the strains, pods, grains and other properties of the final election and after the election of the mixed threshing seed for planting. The number of individual plants to be selected should be based on the needs of the field of seed or farmer producing the following year. (B) chip election law: in the seed field or choose better growth and development of production fields, go to miscellaneous and evil, the mixed varieties of plants or poor growth and development, pests and diseases of bad bad bad, then all the harvest,