In a perfect flower fertilization usually occurs with in each flower and dose not need special attention.

For wind and insect pollinated plants, there are mainly four different techniques for maintaining a pure seed of desired verity, keeping them from contamination throw cross-pollination.

Isolation by Distance- isolation of one plant verity by distances that is large info to prevent cross-pollination throw wind or insects. The distance varies from species to species and there are many recommendations for every species.

Isolation by time- crops from the same species can be planted at different times so they won’t simultaneously flower. This works only given a sufficiently long growing season and only for plants that flower in one burst.

 

Caging with introduced pollinators- constructing a physical barrier made from a frame and screen to prevent cross-pollination of insect-pollinated plants. These techniques are good for plants that can self-pollinate and do not show inbreeding depression. Quenelles hives called Nucs, with ready to hatch bees are placed inside the cage as if that was their world. At seed saver we use  mason bees and alfalfa leaf cotters.

 

 

 

 

 

Hand pollination- especially corn, hand pollination is very commonly used technique of producing pure seeds. Bagging using cloth or paper bags to cover a flower act as a pollen barrier (be aware that temperatures wont be too high inside the bags), some crops can’t be allowed to self pollinate do to inbreeding depression resulting in low yield and unable to produce any seed.

For Diocese species, kept under constant isolation, transferring uncontaminated pollen from male plants\flowers onto the receptive stigma of female flowers. Plant Hand sex.

 

 

 

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