Abstract
A long-term (17-year duration) field experiment was started on newly cleared zinc (Zn)-deficient sandy duplex soil (sand with lateritic ironstone gravel over clay) in south-western Australia that had never been fertilised to measure the residual value of Zn oxide for growing spring wheat (Triticum aestivum L.). When wheat was grown in the field experiment different amounts of Zn were applied once only to plots in 1983, 1984, 1986, 1990, 1992, 1996, 1997, and 2000. When the field experiment was terminated, we collected soil samples from the top 0.10 m of the field plots to do a glasshouse experiment reported here. In the pot experiment 5 amounts of Zn were applied to subsamples of soil collected from each plot of the field experiment. When a yield increase (response) to the freshly applied Zn was obtained in the pot study the maximum yield plateau for the relationship between yield of 54-day-old dried wheat shoots and the amount of Zn freshly applied was similar regardless of when and how much Zn was applied in the field. The amount of Zn freshly applied to soil in the pots required to produce 90% of the maximum yield of dried wheat shoots was determined for soil previously treated with no Zn or different amounts of Zn in different years in the field to provide DM90 values. The DM90 values were largest when no Zn was applied in the field, decreased as more Zn was applied in the field and, for each amount of Zn applied in the field, increased as the number of years from application of Zn increased. For soil treated with 0.5 and 1.0 kg Zn/ha in the field the relationship between DM90 values and the number of years since Zn was applied in the field was approximately linear. The projected number of years taken for soil previously treated with Zn in the field to require the same DM90 values as soil samples collected from the nil-Zn treatments in the field was 23 and 40 years for the 0.5 and 1.0 kg Zn/ha treatments, respectively. In the pot experiment the Zn concentration in plant parts that was related to 90% of the total yield of dried wheat shoots (critical Zn concentration) was ~12 mg/kg for youngest mature growth (YMG) and 22 mg/kg for rest of shoots (ROS). The relationship between yield of dried wheat shoots and DTPA soil test Zn before sowing was similar for all the Zn treatments applied in both the field and pot studies, and the critical value was ~0.17 mg Zn/kg soil.
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Claims 11
Claim · model-written summary
The maximum wheat shoot yield plateau after fresh Zn application was similar regardless of the year and amount of earlier field Zn.
- Taxon
- wheat
Triticum aestivumt0 - Organ / stage
- 54-day-old dried wheat shootse0
- Treatment
- Zn freshly appliede0
- Outcome
- maximum yield plateaue0
- Direction
- similare0
- Comparator
- when and how much Zn was applied in the fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the maximum yield plateau for the relationship between yield of 54-day-old dried wheat shoots and the amount of Zn freshly applied was similar regardless of when and how much Zn was applied in the field”
t0“wheat”
Claim · model-written summary
The fresh Zn amount needed for 90% maximum wheat shoot yield was greatest in soil with no previous field Zn.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- no Zn was applied in the fielde0
- Outcome
- DM90 valuese0
- Direction
- largeste0
- Comparator
- different amounts of Zne1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The DM90 values were largest when no Zn was applied in the field”
e1“different amounts of Zn in different years in the field”
t0“wheat”
Claim · model-written summary
The fresh Zn requirement for 90% maximum wheat shoot yield decreased as previous field Zn application increased.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- more Zn was applied in the fielde0
- Outcome
- DM90 valuese1
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased as more Zn was applied in the field”
e1“The DM90 values were largest when no Zn was applied in the field”
t0“wheat”
Claim · model-written summary
For each previous field Zn amount, the fresh Zn requirement for 90% maximum wheat shoot yield increased with time since application.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Zn applied in the fielde0
- Outcome
- DM90 valuese1
- Direction
- increasede0
- Qualifier
- number of years from application of Zne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for each amount of Zn applied in the field, increased as the number of years from application of Zn increased”
e1“The DM90 values were largest when no Zn was applied in the field”
t0“wheat”
Claim · model-written summary
For previous field applications of 0.5 and 1.0 kg Zn/ha, the relation between fresh Zn requirement and elapsed years was approximately linear.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 0.5 and 1.0 kg Zn/hae0
- Outcome
- DM90 valuese0
- Qualifier
- approximately lineare0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For soil treated with 0.5 and 1.0 kg Zn/ha in the field the relationship between DM90 values and the number of years since Zn was applied in the field was approximately linear.”
t0“wheat”
Claim · model-written summary
The projected residual life for the 0.5 kg Zn/ha treatment was 23 years before the fresh Zn requirement matched untreated field soil.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 0.5 and 1.0 kg Zn/ha treatmentse0
- Outcome
- projected number of yearse0
- Value
- 23e0
- Comparator
- nil-Zn treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The projected number of years taken for soil previously treated with Zn in the field to require the same DM90 values as soil samples collected from the nil-Zn treatments in the field was 23 and 40 years for the 0.5 and 1.0 kg Zn/ha treatments, respectively.”
t0“wheat”
Claim · model-written summary
The projected residual life for 1.0 kg Zn/ha was 40 years before the fresh Zn requirement matched untreated field soil.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 1.0 kg Zn/hae0
- Outcome
- projected number of yearse0
- Value
- 40 yearse0
- Comparator
- nil-Zn treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The projected number of years taken for soil previously treated with Zn in the field to require the same DM90 values as soil samples collected from the nil-Zn treatments in the field was 23 and 40 years for the 0.5 and 1.0 kg Zn/ha treatments, respectively.”
t0“wheat”
Claim · model-written summary
Critical Zn concentration for 90% wheat shoot yield was about 12 mg/kg in youngest mature growth.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- youngest mature growth (YMG)e0
- Outcome
- critical Zn concentratione0
- Value
- ~12 mg/kge0
- Qualifier
- 90% of the total yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Zn concentration in plant parts that was related to 90% of the total yield of dried wheat shoots (critical Zn concentration) was ~12 mg/kg for youngest mature growth (YMG)”
t0“wheat”
Claim · model-written summary
Critical Zn concentration for 90% wheat shoot yield was 22 mg/kg in the rest of shoots.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- rest of shoots (ROS)e0
- Outcome
- critical Zn concentratione0
- Value
- 22 mg/kge0
- Qualifier
- 90% of the total yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Zn concentration in plant parts that was related to 90% of the total yield of dried wheat shoots (critical Zn concentration) was ~12 mg/kg for youngest mature growth (YMG) and 22 mg/kg for rest of shoots (ROS)”
t0“wheat”
Claim · model-written summary
The relation between wheat shoot yield and presowing DTPA soil test Zn was similar across field and pot Zn treatments.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Zn treatmentse0
- Outcome
- yield of dried wheat shootse0
- Direction
- similare0
- Comparator
- DTPA soil test Zn before sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship between yield of dried wheat shoots and DTPA soil test Zn before sowing was similar for all the Zn treatments applied in both the field and pot studies”
t0“wheat”
Claim · model-written summary
The critical presowing DTPA soil test Zn value was about 0.17 mg Zn/kg soil for wheat shoot yield.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- critical valuee0
- Value
- ~0.17 mg Zn/kg soile0
- Qualifier
- DTPA soil test Zn before sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“DTPA soil test Zn before sowing was similar for all the Zn treatments applied in both the field and pot studies, and the critical value was ~0.17 mg Zn/kg soil”
t0“wheat”
The same questions in other papers
zinc atom · yield · Triticum aestivum (wheat)Results differ
54 papers in the same direction as this paper · 456 reporting no difference from an alternative
- positive
- positive
- no effect
507 papers more in this group
See all 511 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.