| Application of photoperiodism is common in the poultry industry, as daylight affects egg-laying, mating, and body weight of the fowl. |
| The three men formed an informal team to find the substance that controls photoperiodism. |
| Cryptochromes are pigmented photoreceptors that are involved in blue-light mediated photomorphogenesis and photoperiodism in plants. |
| Avian biologists and commercial poultry producers have recently experimented with the results of light on photoperiodism. |
| Colored mulch research can be traced to historic USDA studies dating back to 1918 that led to the discovery of photoperiodism. |
| Farming knowledge and photoperiodism of sorghum in the Office of Niger. |
