Abstract
Summary. Understanding of genotype and environment interactions will help farmers optimise broccoli ( Brassica oleracea L. var. italica Plenck) yield and quality, by matching cultivars to time of sowing. Limited information is available on the effect of temperature and photoperiod on broccoli yield and quality. The objective of this study was to quantify the temperature and photoperiod responses of yield and quality attributes in a subtropical environment. Three cultivars (‘Fiesta’, ‘Greenbelt’ and ‘Marathon’) were sown on 8 dates from 11 March to 22 May 1997. Plants were grown under natural and extended (16 h) photoperiods at Gatton College, south-east Queensland, under non-limiting conditions of water and nutrient supply. Climatic data, dates of emergence, floral initiation, harvest maturity, and yield and quality data were recorded. As growing season mean minimum temperature decreased, fresh weight of tops decreased linearly while fresh weight harvest index increased linearly. However, there was no definite relationship between fresh weight of tops or fresh weight harvest index, and growing season mean minimum temperatures =10ºC. Quality attributes were determined more by genotype than environment. ‘Fiesta’ had the best quality, with higher head shape and branching angle ratings than Greenbelt and Marathon. Bud colour and cluster separation ratings of Marathon were only suited for export when growing season mean minimum temperatures were <8ºC. Photoperiod did not influence yield and quality in this study.
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Claims 7
Claim · model-written summary
Fresh weight of tops decreased linearly as growing-season mean minimum temperature decreased.
- Taxon
- Broccoli
Brassica oleracea var. italicat0 - Treatment
- growing season mean minimum temperaturee1
- Outcome
- fresh weight of topse1
- Direction
- decreasede1
- Qualifier
- linearlye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“As growing season mean minimum temperature decreased, fresh weight of tops decreased linearly while fresh weight harvest index increased linearly”
t0“Broccoli yield”
Claim · model-written summary
Fresh weight harvest index increased linearly as growing-season mean minimum temperature decreased.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Treatment
- growing season mean minimum temperaturee1
- Outcome
- fresh weight harvest indexe1
- Direction
- increasede1
- Qualifier
- linearlye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“As growing season mean minimum temperature decreased, fresh weight of tops decreased linearly while fresh weight harvest index increased linearly”
t0“Broccoli yield”
Claim · model-written summary
No definite relationship existed between fresh weight of tops or harvest index and growing-season mean minimum temperatures at or above 10 ºC.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Treatment
- growing season mean minimum temperaturese1
- Outcome
- fresh weight of tops or fresh weight harvest indexe1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“there was no definite relationship between fresh weight of tops or fresh weight harvest index, and growing season mean minimum temperatures =10ºC”
t0“Broccoli yield”
Claim · model-written summary
Quality attributes were determined more by genotype than by environment.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Material
- genotypee1
- Outcome
- Quality attributese1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Quality attributes were determined more by genotype than environment”
t0“Broccoli yield”
Claim · model-written summary
Fiesta had higher head shape and branching angle ratings than Greenbelt and Marathon.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Material
- Fiestae1
- Outcome
- head shape and branching angle ratingse1
- Direction
- highere1
- Comparator
- Greenbelt and Marathone1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“‘Fiesta’ had the best quality, with higher head shape and branching angle ratings than Greenbelt and Marathon”
t0“Broccoli yield”
Claim · model-written summary
Bud colour and cluster separation ratings of Marathon were suited for export only when growing-season mean minimum temperatures were below 8 ºC.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Material
- Marathone1
- Treatment
- growing season mean minimum temperatures were <8ºCe1
- Outcome
- Bud colour and cluster separation ratingse1
- Qualifier
- only suited for exporte1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Bud colour and cluster separation ratings of Marathon were only suited for export when growing season mean minimum temperatures were <8ºC”
t0“Broccoli yield”
Claim · model-written summary
Photoperiod did not influence broccoli yield and quality, relative to natural photoperiod.
- Taxon
- BroccoliBrassica oleracea var. italicat0
- Treatment
- Photoperiode1
- Outcome
- yield and qualitye1
- Direction
- no_changeinferrede1
- Comparator
- naturale2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Photoperiod did not influence yield and quality in this study”
e2“Plants were grown under natural and extended (16 h) photoperiods”
t0“Broccoli yield”
The same questions in other papers
light · quality: general · Brassica oleracea (wild cabbage)Positive and negative results
3 papers in the same direction as this paper · 6 in the opposite direction
- no effect
- positive
- positive
6 papers more in this group
See all 10 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.