Archive image from page 16 of Day length and crop yields. Day length and crop yields daylengthcropyie507park Year: 1942 its production. Foi ex- ample, \ ery excellent yields ill sugar-beel seed are now being produced in certain areas of the Pacific Xorth- Wes\ where the 1 cm | x â i;i- tures are sufficiently mild to permit overwintering and the longer summer photo- periods are especially favor- able. As a result of these recent developments the United States now produces enough sugar-beet seed for its own use. Onions also show a range in sensitivity and adjust- ment to photoperiod, not only
Archive image from page 16 of Day length and crop yields. Day length and crop yields daylengthcropyie507park Year: 1942 its production. Foi ex- ample, \ ery excellent yields ill sugar-beel seed are now being produced in certain areas of the Pacific Xorth- Wes\ where the 1 cm | x â i;i- tures are sufficiently mild to permit overwintering and the longer summer photo- periods are especially favor- able. As a result of these recent developments the United States now produces enough sugar-beet seed for its own use. Onions also show a range in sensitivity and adjust- ment to photoperiod, not only in flowering but par- ticularly in bulh produc- tion. Failure of certain varieties to produce mar- ketable bulbs in one locality and their successful produc- tion in another often resull from their relative degrees of adjustment to the photo- periods prevailing in such localities while grov. th and bulbing should be taking place. Because of this fact attention must be given to l he determination and selec- tion of localities u here the Largest crops can be mosl economically and success- fully produced. in the case of other types of plants, testing the varieties under experimental conditions w ill give exact information on their probable success or failure with respect to the Many varieties of potato generally fail to ma- ture the berrylike seed balls but do so when the photoperiod is sufficiently long. 13
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