Light requirements for germination of loblolly pine seeds
The light requirement for germination of loblolly pine seeds can be met during stratification or germination. One hour of irradiation with light at a avelength of 660 nm and an intensity of 600 ergs/cm2/sec fulfilled the light requirements for germination of seeds stratified for 28 days. Fifteen minutes of the same light at an intensity of 2000 ergs/cm2/sec was adequate when the stratification period was only 15 days. Exposure of seeds to light during stratification neither hastened nor increased germination in light.