Abstract
Abstract The timing of the crop is probably the most important thing that Easter lily ( Lilium longiforum thunb) forcers must accomplish, and the variable date of Easter complicates scheduling (6, 12). The influence of bulb maturity and treatments prior to being placed in the greenhouse, often not under the grower’s control, makes forcing a challenge (2, 11, 17). Several methods are used to monitor progress of the crop, but adjusting temperatures is the actual means of controlling the rate of growth and development. Measurements of time and temperature, expressed as heat units or degree-days, are used to monitor the growth and development of many crops (1, 13, 21) and to predict with a high level of precision certain stages of their development. Degree-days or heat units offer little advantage over time alone as indicators of crop progress under conditions where temperature can be controlled to eliminate or minimize variations. Variations in greenhouse temperatures, greater during daytime hours than at night, especially in southern U.S. locations, are largely responsible for timing problems with Easter lilies. Heat unit summations may be reliable indicators where such variations occur. There are apparently no reports of attempts to use heat units or degree-days to monitor Easter lily shoot development.
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Claims 3
Claim · model-written summary
Degree-days offer little advantage over time under controlled temperatures.
- Taxon
- Easter Lilies
.JPG?width=60)
Lilium longiflorumt0 - Outcome
- indicators of crop progresse0
- Qualifier
- under conditions where temperature can be controlled to eliminate or minimize variationse0
- Comparator
- time alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.JPG?width=500)
Verbatim
e0“Degree-days or heat units offer little advantage over time alone as indicators of crop progress under conditions where temperature can be controlled to eliminate or minimize variations.”
t0“Easter Lilies”
Claim · model-written summary
Greenhouse temperature variation is largely responsible for Easter lily timing problems.
- Taxon
- Easter liliesLilium longiflorume0
- Outcome
- timing problems with Easter liliese0
- Qualifier
- greater during daytime hours than at nighte0
- Setting
- southern U.S. locationse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Variations in greenhouse temperatures, greater during daytime hours than at night, especially in southern U.S. locations, are largely responsible for timing problems with Easter lilies.”
Claim · model-written summary
Heat-unit summations may reliably indicate progress where temperatures vary.
- Taxon
- Easter LiliesLilium longiflorumt0
- Outcome
- reliable indicatorse0
- Qualifier
- where such variations occure0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat unit summations may be reliable indicators where such variations occur.”
t0“Easter Lilies”