Abstract
Nitrogen harvest index (grain nitrogen content over total nitrogen content ratio) is a measure of the efficiency of nitrogen translocation from the vegetative portions of the plant to the grain. It can be recommended as a selection criterion for nitrogen use efficiency improvement. The aim of this study was to investigate nitrogen harvest index in twelve bread wheat genotypes at three nitrogen levels and to classify genotypes according to their phenotypic similarity for the examined trait. The results of factorial ANOVA showed that nitrogen harvest index was influenced mostly by the year ? genotype interaction, year of investigation and genotype; and to the lowest extent by the applied nitrogen rate. Increasing nitrogen doses did not lead to the increased nitrogen harvest index. The calculated nitrogen harvest index values were the highest for wheat growing season 2004/05, and the smallest for the season 2006/07. The highest nitrogen harvest indices were calculated for cultivars Pobeda at the N0 rate and Zlatka at the N100 rate (0.93), and the lowest for cultivar Tamaro at the N0 rate (0.63). Analyzing the constructed dendogram, cultivars Pobeda and Renan at all three levels of nitrogen supply can be singled out as the genotypes with the highest, and cultivar Tamaro as the variety with the lowest harvest index value. The results of this study may be used in developing new high-yielding bread wheat cultivars with improved nitrogen use efficiency. Growing such cultivars would provide the savings in mineral fertilizers and minimize their possible harmful effect on environment.
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Claims 8
Claim · model-written summary
Year by genotype interaction, year and genotype influenced nitrogen harvest index most; nitrogen rate contributed least.
- Taxon
- bread wheat
Triticum aestivumt0 - Material
- genotypee0
- Outcome
- nitrogen harvest indexe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen harvest index was influenced mostly by the year ? genotype interaction, year of investigation and genotype; and to the lowest extent by the applied nitrogen rate”
t0“bread wheat”
Claim · model-written summary
Increasing nitrogen doses did not increase nitrogen harvest index.
- Taxon
- bread wheatTriticum aestivumt0
- Treatment
- Increasing nitrogen dosese0
- Outcome
- nitrogen harvest indexe0
- Direction
- did not lead to the increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing nitrogen doses did not lead to the increased nitrogen harvest index”
t0“bread wheat”
Claim · model-written summary
Nitrogen harvest index was highest in 2004/05 and lowest in 2006/07.
- Taxon
- wheatTriticum aestivume0
- Outcome
- nitrogen harvest index valuese0
- Direction
- higheste0
- Setting
- wheat growing season 2004/05e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen harvest index values were the highest for wheat growing season 2004/05, and the smallest for the season 2006/07”
Claim · model-written summary
Pobeda at N0 had a highest nitrogen harvest index of 0.93.
Not reportedTaxon
Verbatim
e0“The highest nitrogen harvest indices were calculated for cultivars Pobeda at the N0 rate and Zlatka at the N100 rate (0.93)”
Claim · model-written summary
Zlatka at N100 had a highest nitrogen harvest index of 0.93.
- Taxon
- bread wheatTriticum aestivumt0
- Material
- Zlatkae0
- Outcome
- nitrogen harvest indicese0
- Direction
- higheste0
- Value
- 0.93e0
- Qualifier
- N100 ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest nitrogen harvest indices were calculated for cultivars Pobeda at the N0 rate and Zlatka at the N100 rate (0.93)”
t0“bread wheat”
Claim · model-written summary
Tamaro at N0 had the lowest nitrogen harvest index, 0.63.
- Taxon
- bread wheatTriticum aestivumt0
- Material
- Tamaroe0
- Outcome
- loweste0
- Direction
- loweste0
- Value
- 0.63e0
- Qualifier
- N0 ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lowest for cultivar Tamaro at the N0 rate (0.63)”
t0“bread wheat”
Claim · model-written summary
Across nitrogen levels, Pobeda and Renan ranked highest and Tamaro lowest for harvest index.
- Taxon
- bread wheatTriticum aestivumt0
- Material
- Pobedae0
- Outcome
- harvest index valuee0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars Pobeda and Renan at all three levels of nitrogen supply can be singled out as the genotypes with the highest, and cultivar Tamaro as the variety with the lowest harvest index value”
t0“bread wheat”
Claim · model-written summary
The authors recommend nitrogen harvest index as a selection criterion for improved nitrogen use efficiency.
- Taxon
- bread wheatTriticum aestivumt0
- Outcome
- selection criterion for nitrogen use efficiency improvemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It can be recommended as a selection criterion for nitrogen use efficiency improvement”
t0“bread wheat”
The same questions in other papers
nitrogen · yield · Triticum aestivum (wheat)Positive and negative results
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