Abstract
Zinc deficiency is common on the sandy acidic soils in south Western Australia for grain production of wheat grown with diammonium phosphate containing low levels of zinc contamination. The effectiveness of zinc fertiliser (zinc oxide or zinc contamination of single superphosphate that were widely used for crops in south Western Australia) was measured in 1996 for grain production of wheat, for zinc applied once only to plots, either in 1996 (current zinc) or in a previous year (previous zinc) (1983, 1984, 1986, 1990, 1992). Relative to current zinc applied as zinc oxide with diammonium phosphate, the effectiveness of previous zinc for dry matter, zinc uptake (zinc concentration × yield) and grain production of wheat decreased relative to the effectiveness of current zinc, the decrease being larger with increasing time since application. Thirteen years after application, the decrease in the effectiveness was about half for dry matter and grain production where wheat was grown with diammonium phosphate. Both currently and previously applied zinc fertiliser increased wheat dry matter, zinc content of the dry matter and grain yields. Zinc applied as a zinc contaminant in single superphosphate in 1983 produced wheat grain yields on the maximum grain yield plateau (about 2.4 t/ha) achieved for the 5 amounts of zinc oxide applied in the current year (1996). The critical concentration of zinc in the youngest emerged leaf and grain for diagnosing zinc deficiency was 12 mg zinc/kg. However, when relating the zinc concentrations in the youngest emerged leaf to the grain yield (prognosis), a zinc concentration of 14 mg zinc/kg was determined.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Previously applied zinc became less effective than current zinc for wheat dry matter, zinc uptake, and grain production as time since application increased.
- Taxon
- wheat
Triticum aestivume0 - Treatment
- previous zince0
- Outcome
- dry matter, zinc uptake (zinc concentration × yield) and grain productione0
- Direction
- decreasede0
- Qualifier
- increasing time since applicatione0
- Comparator
- current zince0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Relative to current zinc applied as zinc oxide with diammonium phosphate, the effectiveness of previous zinc for dry matter, zinc uptake (zinc concentration × yield) and grain production of wheat decreased relative to the effectiveness of current zinc, the decrease being larger with increasing time since application.”
Claim · model-written summary
Thirteen years after application, residual zinc effectiveness for wheat dry matter and grain production was about half under diammonium phosphate.
- Taxon
- wheatTriticum aestivume0
- Outcome
- dry matter and grain productione0
- Direction
- decreasee0
- Value
- about halfe0
- Qualifier
- Thirteen years after applicatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thirteen years after application, the decrease in the effectiveness was about half for dry matter and grain production where wheat was grown with diammonium phosphate.”
Claim · model-written summary
Both current and previous zinc fertilizer applications increased wheat dry matter, dry matter zinc content, and grain yield.
- Taxon
- wheatTriticum aestivume0
- Treatment
- currently and previously applied zinc fertilisere0
- Outcome
- dry matter, zinc content of the dry matter and grain yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both currently and previously applied zinc fertiliser increased wheat dry matter, zinc content of the dry matter and grain yields.”
Claim · model-written summary
Zinc contamination in single superphosphate applied in 1983 produced wheat grain yield on the approximately 2.4 t/ha maximum plateau reached by current zinc oxide applications.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Zinc applied as a zinc contaminant in single superphosphate in 1983e0
- Outcome
- grain yieldse0
- Direction
- maximume0
- Value
- about 2.4 t/hae0
- Comparator
- zinc oxide applied in the current year (1996)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Zinc applied as a zinc contaminant in single superphosphate in 1983 produced wheat grain yields on the maximum grain yield plateau (about 2.4 t/ha) achieved for the 5 amounts of zinc oxide applied in the current year (1996).”
Claim · model-written summary
The critical zinc concentration for diagnosing deficiency in the youngest emerged wheat leaf and grain was 12 mg zinc/kg.
- Organ / stage
- youngest emerged leaf and graine0
- Outcome
- critical concentration of zince0
- Value
- 12 mg zinc/kge0
Not reportedTaxon
Verbatim
e0“The critical concentration of zinc in the youngest emerged leaf and grain for diagnosing zinc deficiency was 12 mg zinc/kg.”
Claim · model-written summary
For prognosis based on youngest emerged leaf zinc versus grain yield, the wheat zinc concentration was 14 mg zinc/kg.
- Organ / stage
- youngest emerged leafe0
- Outcome
- zinc concentratione0
- Value
- 14 mg zinc/kge0
- Comparator
- grain yielde0
Not reportedTaxonDirection
Verbatim
e0“when relating the zinc concentrations in the youngest emerged leaf to the grain yield (prognosis), a zinc concentration of 14 mg zinc/kg was determined.”
The same questions in other papers
zinc atom · yield · Triticum aestivum (wheat)Results differ
455 papers in the same direction as this paper · 49 in the opposite direction · 6 reporting no difference from an alternative
- no effect
- no effect
- no effect
507 papers more in this group
See all 511 papers →impurity · yield · Triticum aestivum (wheat)Positive and negative results
1 in the opposite direction
- no effect
phosphorus · yield · Triticum aestivum (wheat)Positive and negative results
523 papers in the same direction as this paper · 43 in the opposite direction · 5 reporting no difference from an alternative
- negative
- negative
- no effect
568 papers more in this group
See all 572 papers →fertilization · yield · Triticum aestivum (wheat)Positive and negative results
3,114 papers in the same direction as this paper · 284 in the opposite direction · 39 reporting no difference from an alternative
- no effect
- no effect
- negative
3,434 papers more in this group
See all 3,438 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.