Temperatures and net energy gain in a growing, mature head of lettuce
✍ Scribed by Werner J Lipton
- Publisher
- Elsevier Science
- Year
- 1971
- Weight
- 440 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0002-1571
No coin nor oath required. For personal study only.
✦ Synopsis
LIPTON, W. J., 1971
. Temperatures and net energy gain in a growing, mature head of lettuce. Agr.
Meteorol., 8:429-437
A method was developed to determine the net heat gain per unit of time (G) in a mature, growing head of lettuce (Lactuca sativa L., var. capitata) from measured temperatures, by adapting a formula used to calculate internal energy changes in columns of air, water, or soil (SELLERS, 1965). G also was calculated for hypothetical cubes (sides 1 cm), one of which represented the cool side of the head, and the other the warm side, and each having a thermocouple at its center. The mean for the two cubes differs from that for the entire head by less than 10~/o, and avoids the cumbersome determination of the mean temperature of the head.
Tipburn of lettuce was discussed in relation to internal differences in G.