Seasonal recovery of chlorotic needles in Scotch pine
1971
Jones, Jerry K.
S2As part of a research project on Christmas trees being carried on by the USDA Forest Service's Northeastern Forest Experiment Station, the author made a cooperative study of how discolored needles recover their normal color in February and April. Though this does not solve the Christmas tree growers' problem, it does shed some light on the process involved in the discoloration. The study confirmed that the seasonal yellowing of the needles is due primarily to the loss of chlorophyll and, conversely, that a sharp increase in chlorophyll concentration accompanies the return to summer green.S3.
显示更多 [+] 显示较少 [-]AGROVOC关键词
书目信息
出版者 Pa., U.S. Northeastern Forest Experiment Station | Upper Darby, Pa., U.S. Northeastern Forest Experiment Station, 1971