We can't see the corn germ at all from the outside, so there is a black spot is not germ mold, unless the whole corn kernel mold or rot. Fruit with the hand to peel off and the embryonic root of the combination of the tip, the inside is shown as a black spot, the corn grain and the embryonic root of the adhesion, the earliest white, as the corn matures, this bonding film also slowly turned black, and very thin, and still covers the embryonic root of the corn seed, which is the reason you can see the black on the corn seed.
Corn seed germination, in addition to suitable temperature, certain water and sufficient air and other external environmental conditions required, but also with the corn seed itself has a great deal to do with the conditions, such as shriveled seeds, by insects biting the embryo or mechanical threshing to break the embryo of the seed can not germinate, and storage time is too long, the embryo has been dead seeds can not germinate. Some corn seeds have cracks on the surface, and will not affect the seedling rate and germination rate, in fact, corn seed germination or not is composed of embryo and seed coat, embryo is the main part. As long as the embryo of the seed is not damaged, it is possible to germinate and emerge normally. Therefore, as long as the embryo has not been injured, corn seeds are able to germinate. To insure the period, it is best to conduct a corn seed germination test before planting so that you can be sure that the entire acreage will not be affected in the future due to corn seed problems