Abstract
Chilling and heating effects on budbreak of pecan [Carya illinoinensis (Wangenh.) K. Koch] trees were examined by linear regression analyses from experimental data and from records of budbreak dates over a wide geographic range. The results demonstrate that budbreak in pecan is under the interactive control of heating and of chilling. Heat required for budbreak varies inversely with chill accumulation, and budbreak may occur with no chilling once sufficient heat accumulates. Variability in budbreak increases dramatically when there are fewer than ≈ 100 chilling degree days. Heating degree days with daily minima <2.2C are inefficient; 3.9C is the most efficient heating and chilling base. At base 3.9C and the daily minimum heating temperature of 2.2C, heating degree days required for budbreak of a composite of cultivars can be predicted from chilling degree days over a wide geographic range by the relationship, Log Y = 2.7190-0.0216 √X.
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Claims 7
Claim · model-written summary
Pecan budbreak depended jointly on heating and chilling.
- Taxon
- pecan
_1_(24790682337).jpg?width=60)
Carya illinoinensise0 - Treatment
- heating and of chillinge0
- Outcome
- budbreake0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_1_(24790682337).jpg?width=500)
Verbatim
e0“budbreak in pecan is under the interactive control of heating and of chilling”
Claim · model-written summary
Heat required for pecan budbreak decreased as chill accumulation increased.
- Taxon
- pecanCarya illinoinensist0
- Treatment
- chill accumulatione0
- Outcome
- Heat required for budbreake0
- Direction
- inverselye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat required for budbreak varies inversely with chill accumulation”
t0“Pecan”
Claim · model-written summary
Pecan budbreak could occur without chilling after sufficient heat accumulation.
- Taxon
- pecanCarya illinoinensist0
- Outcome
- budbreak may occur with no chillinge0
- Qualifier
- once sufficient heat accumulatese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“budbreak may occur with no chilling once sufficient heat accumulates”
t0“Pecan”
Claim · model-written summary
Pecan budbreak variability increased sharply below about 100 chilling degree days.
- Taxon
- pecanCarya illinoinensist0
- Treatment
- fewer than ≈ 100 chilling degree dayse0
- Outcome
- Variability in budbreake0
- Direction
- increasese0
- Value
- ≈ 100 chilling degree dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Variability in budbreak increases dramatically when there are fewer than ≈ 100 chilling degree days”
t0“Pecan”
Claim · model-written summary
Heating degree days with daily minima below 2.2C were inefficient.
- Taxon
- pecanCarya illinoinensist0
- Outcome
- Heating degree days with daily minima <2.2C are inefficiente0
- Value
- <2.2Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heating degree days with daily minima <2.2C are inefficient”
t0“Pecan”
Claim · model-written summary
A 3.9C base was most efficient for heating and chilling.
- Taxon
- pecanCarya illinoinensist0
- Outcome
- most efficient heating and chilling basee0
- Value
- 3.9Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“3.9C is the most efficient heating and chilling base”
t0“Pecan”
Claim · model-written summary
The stated regression predicted heat days for budbreak from chill days across a broad geographic range.
- Taxon
- pecanCarya illinoinensist0
- Outcome
- heating degree days required for budbreake0
- Value
- Log Y = 2.7190-0.0216 √Xe0
- Qualifier
- over a wide geographic rangee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“heating degree days required for budbreak of a composite of cultivars can be predicted from chilling degree days over a wide geographic range by the relationship, Log Y = 2.7190-0.0216 √X”
t0“Pecan”