Abstract
Crop researchers often store ground plant tissue samples for considerable time before determining their nitrogen (N) concentration. The objective of this study was to determine the effects of storage methods and storage duration on total N analysis in rice leaves. The storage methods investigated were (1) keeping ground leaf tissue in a paper bag, (2) storage in a bottle with additional drying at 70°C for 24 h, or (3) in a bottle without additional drying. Paper bags and sealed bottles were kept under ambient condition. Leaf N concentration was measured about once a month for two years by micro-Kjeldahl method. Storage methods had little effect on leaf N concentration during the two-year storage period. The difference in leaf N concentration was 0.1–0.2 g kg−1 between the samples stored in paper bags and in bottles, which was less than 0.5% of mean value of leaf N concentration. Leaf N concentration was not affected over the two-year storage duration. These results suggest that it is sufficient to keep plant tissue samples in paper bags under ambient condition for at least two years for measurement of leaf N concentration.
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Claims 4
Claim · model-written summary
Storage method had little effect on rice leaf nitrogen concentration over two years.
- Taxon
- rice
Oryza sativae1 - Treatment
- Storage methodse0
- Outcome
- leaf N concentratione0
- Direction
- little effecte0
- Qualifier
- two-year storage periode0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Storage methods had little effect on leaf N concentration during the two-year storage period”
e1“rice leaves”
Claim · model-written summary
Rice leaf nitrogen concentration differed by 0.1–0.2 g kg−1 between paper bag and bottle storage.
- Taxon
- riceOryza sativae1
- Treatment
- paper bagse0
- Outcome
- leaf N concentratione0
- Direction
- differencee0
- Value
- 0.1–0.2 g kg−1e0
- Qualifier
- less than 0.5% of mean value of leaf N concentratione0
- Comparator
- bottlese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The difference in leaf N concentration was 0.1–0.2 g kg−1 between the samples stored in paper bags and in bottles, which was less than 0.5% of mean value of leaf N concentration”
e1“rice leaves”
Claim · model-written summary
Two-year storage duration did not affect rice leaf nitrogen concentration.
- Taxon
- riceOryza sativae1
- Treatment
- two-year storage duratione0
- Outcome
- Leaf N concentratione0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf N concentration was not affected over the two-year storage duration”
e1“rice leaves”
Claim · model-written summary
Ambient paper bag storage is sufficient for at least two years before measuring plant tissue nitrogen.
- Taxon
- riceOryza sativae1
- Outcome
- keep plant tissue samples in paper bags under ambient condition for at least two years for measurement of leaf N concentratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is sufficient to keep plant tissue samples in paper bags under ambient condition for at least two years for measurement of leaf N concentration”
e1“rice leaves”
The same questions in other papers
storage · nutrient: content · Oryza sativa (rice)Positive and negative results
2 papers in the same direction as this paper · 9 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 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.