In the strict sense, seeds are the result of pollination and sexual fertilisation. Apomictic seeds are true seeds produced from maternal tissue only without sexual fertilisation. Farmers often refer to the units of vegetative propagation as 'seed'. Thus seed tubers, seed setts, etc. Seed certification
Seed can be officially certified in various ways. True seed can be certified for identity of cultivar, purity of cultivar, freedom from pests, weeds, and disease , cleanliness, and germination percentage. Seed tubers, setts, and other units of vegetative propagation , can be certified for identity of cultivar, purity of cultivar, freedom from pests, weeds, and diseases, with special emphasis on diseases that are not carried by true seed, such as virus diseases. Seed cleaning
The main reason for cleaning grains that are intended for planting is to eliminate weed seeds and various insects. However, grain that is intended for milling, or marketing as food, must be cleaned of all foreign matter, such as chaff, soil, stones, etc.
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