Abstract
Abstract In a glasshouse trial, wheat (Triticum aestivum cv. Gamenya) was grown in pots using a range of southwestern Australian soils to which zinc (Zn) fertilizer was applied. Before wheat was planted, soil samples were collected to measure DTPA‐extractable Zn, which was related to the total dry matter production (straw and grain) of the wheat plants. The critical levels of DTPA extractable zinc (ZnD), determined for the maximum dry matter production of wheat, were found to vary among the 36 responsive soil types. Six soils were zinc‐adequate, and grain yield did not respond to zinc fertilizer. Consequently, for these soils the ZnD values were found to be the same or above the measured DTPA soil‐extractable Zn where no Zn fertilizer had been applied. ZnD values were related to (i) pH (1:5 w/v 0.01 mol/L CaCl2) of the soil (r2 = 0.74); (ii) clay content of the soils, which explained about 60% of the variation; and (iii) organic carbon content (%) of the soil. The equation selected in a stepwise linear regression was: * DTPA critical Zn level = 0.04 + 0.019 pH + 0.003 clay(%) + 0.004 organic carbon (%) (n = 36, r2 = 0.878).
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Claims 7
Claim · model-written summary
Critical DTPA-extractable zinc levels for maximum wheat dry matter production varied among 36 responsive soil types.
- Taxon
- wheat
Triticum aestivume0 - Outcome
- critical levels of DTPA extractable zinc (ZnD)e0
- Qualifier
- 36 responsive soil typese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The critical levels of DTPA extractable zinc (ZnD), determined for the maximum dry matter production of wheat, were found to vary among the 36 responsive soil types.”
Claim · model-written summary
Grain yield in six zinc-adequate soils did not respond to zinc fertilizer.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- zinc fertilizere0
- Outcome
- grain yielde0
- Direction
- did not responde0
- Qualifier
- Six soils were zinc‐adequatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Six soils were zinc‐adequate, and grain yield did not respond to zinc fertilizer.”
t0“wheat production”
Claim · model-written summary
In zinc-adequate soils, critical ZnD equalled or exceeded measured DTPA-extractable soil Zn without fertilizer.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- ZnD valuese0
- Direction
- the same or abovee0
- Comparator
- measured DTPA soil‐extractable Zne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for these soils the ZnD values were found to be the same or above the measured DTPA soil‐extractable Zn where no Zn fertilizer had been applied.”
t0“wheat production”
Claim · model-written summary
Critical ZnD was related to soil pH with r2 = 0.74.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- ZnD valuese0
- Value
- r2 = 0.74e0
- Setting
- soile0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ZnD values were related to (i) pH (1:5 w/v 0.01 mol/L CaCl2) of the soil (r2 = 0.74)”
t0“wheat production”
Claim · model-written summary
Soil clay content explained about 60% of variation in critical ZnD.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- ZnD valuese1
- Value
- about 60%e0
- Setting
- soilse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“clay content of the soils, which explained about 60% of the variation”
e1“ZnD values were related to”
t0“wheat production”
Claim · model-written summary
Critical ZnD was also related to soil organic carbon content.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- ZnD valuese0
- Setting
- soile1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ZnD values were related to”
e1“organic carbon content (%) of the soil”
t0“wheat production”
Claim · model-written summary
A stepwise regression equation combining pH, clay and organic carbon explained critical DTPA Zn level with r2 = 0.878.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- DTPA critical Zn levele0
- Value
- r2 = 0.878e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DTPA critical Zn level = 0.04 + 0.019 pH + 0.003 clay(%) + 0.004 organic carbon (%) (n = 36, r2 = 0.878).”
t0“wheat production”
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