Abstract
A pot experiment in which wheat cv. Timgalen was grown in a glasshouse for 6 weeks clearly established that some of the 12 Darling Downs black earths investigated were zinc deficient. Rates of application between 1.2 and 3.7 kg zinc ha-1 (as ZnSO4.7H2O) were sufficient to achieve maximum or near-maximum dry matter yield of tops on the deficient soils. Plant zinc concentration and total zinc uptake in the tops increased in all soils with increasing rates of zinc application. The critical zinc concentration in the wheat tops associated with 90% of maximum dry matter yield was 20 ¦g g-1. Three extraction methods were used to determine the initial available zinc status of the soils. All methods gave lower extractable zinc values in the acid (pH <7 . 0 in 0.01 M calcium chloride) black earths (Mywybilla soils) than in the alkaline black earths. Critical extractable zinc values were much lower in the acid black earths. EDTA-ammonium carbonate (pH 8.6) more effectively separated zinc-deficient and marginally deficient from adequately supplied alkaline black earths than either EDTA-ammonium acetate (pH 7.0) or DTPA (pH 7.3). The critical extractable zinc value for the alkaline black earths with EDTA-ammonium carbonate was 0.61 ¦g g-1.
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Claims 8
Claim · model-written summary
Some of the 12 Darling Downs black earths were zinc deficient for wheat.
- Taxon
- wheat
Triticum aestivumt0 - Material
- cv. Timgalene0
- Outcome
- zinc deficiente0
- Setting
- glasshousee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc availability to young wheat plants in Darling Downs black earths”
e0“A pot experiment in which wheat cv. Timgalen was grown in a glasshouse for 6 weeks clearly established that some of the 12 Darling Downs black earths investigated were zinc deficient”
Claim · model-written summary
Application rates of 1.2 to 3.7 kg zinc per ha were sufficient for maximum or near-maximum dry matter yield of wheat tops on deficient soils.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Rates of application between 1.2 and 3.7 kg zinc ha-1 (as ZnSO4.7H2O)e0
- Outcome
- dry matter yield of topse0
- Direction
- maximum or near-maximume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc availability to young wheat plants in Darling Downs black earths”
e0“Rates of application between 1.2 and 3.7 kg zinc ha-1 (as ZnSO4.7H2O) were sufficient to achieve maximum or near-maximum dry matter yield of tops on the deficient soils”
Claim · model-written summary
Plant zinc concentration and total zinc uptake in the tops increased in all soils with increasing zinc application rates.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- increasing rates of zinc applicatione0
- Outcome
- Plant zinc concentration and total zinc uptake in the topse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc availability to young wheat plants in Darling Downs black earths”
e0“Plant zinc concentration and total zinc uptake in the tops increased in all soils with increasing rates of zinc application”
Claim · model-written summary
The critical zinc concentration in wheat tops associated with 90% of maximum dry matter yield was 20 ¦g g-1.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- critical zinc concentration in the wheat topse0
- Value
- 20 ¦g g-1e0
- Qualifier
- associated with 90% of maximum dry matter yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc availability to young wheat plants in Darling Downs black earths”
e0“The critical zinc concentration in the wheat tops associated with 90% of maximum dry matter yield was 20 ¦g g-1”
Claim · model-written summary
Acid black earths gave lower extractable zinc values than alkaline black earths with all three extraction methods.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- extractable zinc valuese0
- Direction
- lowere0
- Comparator
- alkaline black earthse0
- Setting
- acide0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc availability to young wheat plants in Darling Downs black earths”
e0“All methods gave lower extractable zinc values in the acid (pH <7 . 0 in 0.01 M calcium chloride) black earths (Mywybilla soils) than in the alkaline black earths”
Claim · model-written summary
Critical extractable zinc values were much lower in acid black earths than in alkaline black earths.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- Critical extractable zinc valuese0
- Direction
- much lowere0
- Setting
- acid black earthse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc availability to young wheat plants in Darling Downs black earths”
e0“Critical extractable zinc values were much lower in the acid black earths”
Claim · model-written summary
EDTA-ammonium carbonate (pH 8.6) separated zinc-deficient and marginally deficient alkaline black earths from adequately supplied ones more effectively than EDTA-ammonium acetate or DTPA.
- Taxon
- wheatTriticum aestivumt0
- Compound
- EDTA-ammonium carbonatee0
- Outcome
- separated zinc-deficient and marginally deficient from adequately supplied alkaline black earthse0
- Direction
- more effectivelye0
- Comparator
- EDTA-ammonium acetate (pH 7.0) or DTPA (pH 7.3)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc availability to young wheat plants in Darling Downs black earths”
e0“EDTA-ammonium carbonate (pH 8.6) more effectively separated zinc-deficient and marginally deficient from adequately supplied alkaline black earths than either EDTA-ammonium acetate (pH 7.0) or DTPA (pH 7.3)”
Claim · model-written summary
The critical extractable zinc value for alkaline black earths with EDTA-ammonium carbonate was 0.61 ¦g g-1.
- Taxon
- wheatTriticum aestivumt0
- Compound
- EDTA-ammonium carbonatee0
- Outcome
- critical extractable zinc valuee0
- Value
- 0.61 ¦g g-1e0
- Setting
- alkaline black earthse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zinc availability to young wheat plants in Darling Downs black earths”
e0“The critical extractable zinc value for the alkaline black earths with EDTA-ammonium carbonate was 0.61 ¦g g-1”
The same questions in other papers
zinc atom · yield · Triticum aestivum (wheat)Results differ
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- no effect
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See all 511 papers →zinc sulfate heptahydrate · yield · Triticum aestivum (wheat)Results agree
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- positive
- positive
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See all 8 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.