. Circular. Agriculture; Agriculture -- United States. G ARTIFICIAL POLLINATION IN CORN. Since the tubes remain in place until all danger from foreign pollen is past, provision must be made for the increasing size of the ear. This can be done by using a coiled instead of a straight Avire to fasten the tube to the ear. The coiled wires are easih' made by Avrapping the -wire around any small cone-shaped object, like tiie point of a lead pencil. The advantage of the cone-shaped coil over a cjdindrical coil is that the tension necessary to straighten the coil is nicely graduated when a cone-shaped
. Circular. Agriculture; Agriculture -- United States. G ARTIFICIAL POLLINATION IN CORN. Since the tubes remain in place until all danger from foreign pollen is past, provision must be made for the increasing size of the ear. This can be done by using a coiled instead of a straight Avire to fasten the tube to the ear. The coiled wires are easih' made by Avrapping the -wire around any small cone-shaped object, like tiie point of a lead pencil. The advantage of the cone-shaped coil over a cjdindrical coil is that the tension necessary to straighten the coil is nicely graduated when a cone-shaped coil is used. (Fig. 2.) Some experience is necessary to apply the tubes properly, and the exact manner has to be varied slightly for the different types of corn. When the ears are well exserted before silking it has been found best to bring the leaf just below the ear up against the outside of the tube and pass the wire around it; otherwise, it is dif- ficult to keep the tube from slipping off the ear as the stalk elongates. The most difficult cases are those where the exsertion of the ear at silking is small, In such cases it is necessary to pass the wire around the stalk as well as around the leaf. "\Mtli varie- ties that have large husk leaves it is Avell to remove them by cutting off the tips of the husks at a point beyond the tip of the young ear; otherwise, the silks become entangled in the mass of leaves and tlie pollen fails to gain access to all. While this method can be generally applied only to ears that are to be self-pollinated, it works equally well for artificially crossing two plants that are adjacent in the same or neigliboring rows. In testing Mendelian ratios it will be found convenient to arrange the planting Avith the hybrids betAveen the parents. It Avill thus be pos- sible to apply the method to self-pollinations and crosses betAveen the hybrid and the parents. Whei-e the tubes are used it Avould seem that the oidy possible source of contamination A
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