Archive image from page 20 of Day length and crop yields. Day length and crop yields daylengthcropyie507park Year: 1942 Some of the earlier equipment employed by Garner and Allard, who used many kinds of wild and cultivated plants. Photoperiod an Aid in Plant Breeding The photoperiodic behavior of many varieties i plants is of great economic significance in the developmenl of new varieties. In many localities the common potato as grown in the field frequently produ large numbers of flowers bul lew seeds. In the commercial produc- tion of potatoes this is no detrimenl because they are grown b
Archive image from page 20 of Day length and crop yields. Day length and crop yields daylengthcropyie507park Year: 1942 Some of the earlier equipment employed by Garner and Allard, who used many kinds of wild and cultivated plants. Photoperiod an Aid in Plant Breeding The photoperiodic behavior of many varieties i plants is of great economic significance in the developmenl of new varieties. In many localities the common potato as grown in the field frequently produ large numbers of flowers bul lew seeds. In the commercial produc- tion of potatoes this is no detrimenl because they are grown bj planting whole tubers or pieces of them. But if a new variety of potato is desired, il is mosl quickly obtained by growing the seeds and selecting the type desired from among the seedlings. Seeds are now readilj obtained l>\ growing potato plants in greenhouses, where the photoperiod can be lengthened to suit their requirements for seed development. When this is done and utter pollination has been effected, a number of varieties which usualrj do not set seed well do so \ erj readily.
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