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一、汰选 1、筛选。当种子中夹杂的虫瘿、菌核、针叶碎屑、活虫的数量比较多时,可用过筛的方法,清除其中夹杂的病虫。过筛时,根据种粒和被除物的大小、形状,选择筛孔适宜的筛子,才能达到要求。同时,还可以利用筛子旋转的物理作用,除去不饱满种粒以及其它夹杂物。 2、风选。带病种子或病原物往往较健康种子重量轻。所以,可以依靠风扇或自然风力将轻重不同的种子和病原物以及其它杂物分开。例如对感染桦坚果僵化病的桦树种子可用风选法淘汰病种。但需强调的是,用该法只能淘汰部分病种或病原物。 3、手选。种子量不多时,可以请有经验的人员通过肉眼
First, the selection 1, screening. When the seeds mixed with insects, sclerotia, coniferous detritus, the number of live insects more time available sieving method to remove the inclusion of pests. Sieving, according to the seeds and the size of the material was removed, the shape of the sieve to select the appropriate sieve to meet the requirements. At the same time, it is also possible to take advantage of the physical effect of sieve rotation to remove under-sized seeds and other inclusions. 2, the wind election. Sick seeds or pathogens tend to be lighter than healthy seeds. Therefore, you can rely on the fan or natural wind will be different severity of seeds and pathogens and other debris separated. For example, birch seeds infected with birch nuts can be eliminated by wind selection. However, it should be emphasized that only some diseases or pathogens can be eliminated by this method. 3, hand-selected. When the seed is small, please have experienced people through the naked eye