Abstract
Leaves of winter wheat (Triticum aestivum L.) were measured with a Hydro N-Tester (HNT), a portable chlorophyll meter, to obtain a relative estimate of leaf chlorophyll content, which gives an indication of plant N-status. The aim was to find if there were differences in HNT values between the winter wheat cultivars investigated, and to assess whether these values could be used for prediction of grain protein content (GPC). In Experiment 1, chlorophyll meter readings were taken at growth stages (GS) Zadoks 31 and 55 in five winter wheat (Triticum aestivum L.) cultivars in 17 annual field trials located in southeast Norway in 1996, 1997, and 1998. There were significant differences in HNT values between cultivars at both GS 31 and 55, but no differences were found between the three most commonly used cultivars in Norway at present, cvs. Bjørke, Mjølner and Rudolf. Because of the variation between years the HNT values at GS 55 were found to be unsuitable for direct prediction of the GPC. In Experiment 2, HNT was used in 21 annual N-fertilizer trials with winter wheat, performed in 1996 and 1997 and located in southeast Norway. A delay in the measurements from GS 55 to GS 65 generally improved the GPC prediction in 1996. Nitrogen applied at GS 55 increased GPC by approximately 1 unit of percent in cv. Folke, regardless of HNT value, while in cv. Portal nitrogen applied at this stage gave no increase in GPC at HNT values beyond 700.
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Claims 6
Claim · model-written summary
HNT values differed significantly among cultivars at GS 31 and 55.
Not reportedTaxonDirection
Verbatim
e0“There were significant differences in HNT values between cultivars at both GS 31 and 55”
Claim · model-written summary
HNT values did not differ among Bjørke, Mjølner, and Rudolf.
- Taxon
- Winter Wheat
Triticum aestivumt0 - Material
- cvs. Bjørke, Mjølner and Rudolfe0
- Outcome
- no differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no differences were found between the three most commonly used cultivars in Norway at present, cvs. Bjørke, Mjølner and Rudolf”
t0“Winter Wheat”
Claim · model-written summary
Year variation made GS 55 HNT values unsuitable for direct GPC prediction.
- Taxon
- Winter WheatTriticum aestivumt0
- Outcome
- unsuitable for direct prediction of the GPCe0
- Comparator
- variation between yearse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Because of the variation between years the HNT values at GS 55 were found to be unsuitable for direct prediction of the GPC”
t0“Winter Wheat”
Claim · model-written summary
Delaying HNT measurements from GS 55 to GS 65 generally improved GPC prediction in 1996.
- Taxon
- Winter WheatTriticum aestivumt0
- Outcome
- GPC predictione0
- Direction
- improvede0
- Comparator
- GS 55e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A delay in the measurements from GS 55 to GS 65 generally improved the GPC prediction in 1996”
t0“Winter Wheat”
Claim · model-written summary
N applied at GS 55 increased GPC by approximately 1 unit of percent in Folke regardless of HNT value.
- Taxon
- Winter WheatTriticum aestivumt0
- Material
- cv. Folkee0
- Treatment
- Nitrogen applied at GS 55e0
- Outcome
- GPCe0
- Direction
- increasede0
- Value
- approximately 1 unit of percente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen applied at GS 55 increased GPC by approximately 1 unit of percent in cv. Folke, regardless of HNT value”
t0“Winter Wheat”
Claim · model-written summary
N applied at GS 55 gave no GPC increase in Portal at HNT values beyond 700.
- Taxon
- Winter WheatTriticum aestivumt0
- Material
- cv. Portale0
- Treatment
- nitrogen applied at this stagee0
- Outcome
- GPCe0
- Direction
- no increasee0
- Qualifier
- HNT values beyond 700e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in cv. Portal nitrogen applied at this stage gave no increase in GPC at HNT values beyond 700”
t0“Winter Wheat”
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