| The photoperiods were lengthened by high-pressure sodium lamps or shortened by black screens when necessary. |
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| Calhoun measured responses to varying photoperiods, but tested only one animal in non-normal photoperiods. |
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| Researchers collected early and late season eggs, separating some into component parts and incubating others for short or long photoperiods. |
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| We can grow these strawberries under shorter photoperiods than we thought and still get pretty much the same amount of yield. |
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| By rounding the hours, and then calculating morning and afternoon photoperiods, the students can easily calculate the entire day's photoperiod. |
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| Growth, gonadal development and spawning time of Atlantic cod reared under different photoperiods. |
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| Plasma prolactin and gonadotrophins during gonadal development and the onset of photorefractoriness in male and female starlings on artificial photoperiods. |
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| However, potatoes grown in the major production areas in Europe, North America and Asia must be able to tuberize under the long photoperiods of temperate zone summers. |
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| Effect of natural and artificial photoperiods and fluctuating temperature on age of first mating and mating frequency in the navel orangeworm, Amyelois transitella. |
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