What qualities hybrid seeds have ensure a healthy harvest
Answers
Varietal purity is heavily influenced by the type of pollination. Self-pollinated plants need be only a few feet apart to prevent the pollen of one plant from pollinating nearby plants of another variety. Cross-pollinated species, on the other hand, may need to be separated by several hundred feet to isolate them from plants of different varieties.
In self-pollinated crops, stray pollen from an off-type plant can pollinate flowers on several other plants, thus reducing varietal purity. Off-type plants should be removed before pollination occurs. In cross pollination, pollen is moved long distances. Thus, a single off-type plant in a seed field can pollinate flowers on hundreds of other plants.
Varietal purity is not easily achieved. It requires timely and careful roguing (removal) of off-type plants. Seed certification agencies and seed breeding companies use field inspection programs to maintain varietal purity.
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