Abstract
In a glasshouse experiment with wheat (Triticum aestivum L.), changes in the concentrations of total sulphur, sulphate sulphur, amide nitrogen, and total nitrogen/total sulphur ratio with age, plant part, and nitrogen and sulphur supply, were studied. This was done so that more reliable methods can be devised for the assessment of the sulphur status of this species. Each of the indices studied was strongly related to the current and subsequent sulphur status of the wheat plant. Amide nitrogen provided the greatest relative change in values between sulphur-deficient and sulphur-adequate plants, and on that basis was the most sensitive index. However, each of these indices had shortcomings which could preclude its general acceptance as a useful indicator of sulphur status. The most promising index of sulphur status was shown to be the proportion of total sulphur held as sulphate. This criterion was unaffected by nitrogen supply or plant age. The data suggest that wheat plants containing more than one-tenth of their sulphur as sulphate are adequately supplied with sulphur.
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Claims 8
Claim · model-written summary
All four measured indices related strongly to current and subsequent sulphur status.
- Taxon
- wheat
Triticum aestivume0 - Organ / stage
- plante0
- Outcome
- current and subsequent sulphur statuse0
- Qualifier
- Each of the indices studiede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Each of the indices studied was strongly related to the current and subsequent sulphur status of the wheat plant”
Claim · model-written summary
Amide nitrogen had the greatest relative change between deficient and adequate plants.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- relative change in valuese0
- Direction
- greateste0
- Qualifier
- sulphur-deficiente0
- Comparator
- sulphur-adequate plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Amide nitrogen provided the greatest relative change in values between sulphur-deficient and sulphur-adequate plants”
t0“wheat”
Claim · model-written summary
Amide nitrogen was the most sensitive sulphur index.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- most sensitive indexe0
- Direction
- most sensitivee0
- Comparator
- sulphur-adequate plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Amide nitrogen provided the greatest relative change in values between sulphur-deficient and sulphur-adequate plants, and on that basis was the most sensitive index”
t0“wheat”
Claim · model-written summary
Each tested index had drawbacks limiting general acceptance.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- shortcomings which could preclude its general acceptancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“each of these indices had shortcomings which could preclude its general acceptance as a useful indicator of sulphur status”
t0“wheat”
Claim · model-written summary
The sulphate share of total sulphur was the most promising status index.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- most promising index of sulphur statuse0
- Comparator
- proportion of total sulphur held as sulphatee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most promising index of sulphur status was shown to be the proportion of total sulphur held as sulphate”
t0“wheat”
Claim · model-written summary
Nitrogen supply did not affect the sulphate share criterion.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- nitrogen supplye0
- Outcome
- This criterione0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This criterion was unaffected by nitrogen supply or plant age”
t0“wheat”
Claim · model-written summary
Plant age did not affect the sulphate share criterion.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- plant agee0
- Outcome
- This criterione0
- Direction
- unaffectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This criterion was unaffected by nitrogen supply or plant age”
t0“wheat”
Claim · model-written summary
Wheat with over one-tenth of its sulphur as sulphate was considered adequately supplied.
- Taxon
- wheatTriticum aestivume0
- Outcome
- adequately supplied with sulphure0
- Value
- more than one-tenthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat plants containing more than one-tenth of their sulphur as sulphate are adequately supplied with sulphur”