Abstract
On-farm trial was conducted from 2005 to 2008 to test the hypothesis that reduction of total dry matter (TDM) in crops can occur after a decreased radiation use efficiency (RUE) due to shortage of nitrogen and irrigation, we applied three irrigations treatments (D1, D2 and D3) and four nitrogen rates (N1, N2, N3 and N4). Photosynthetic active radiation absorbed or cumulative light interception (PARabs) and RUE of Durum wheat were measured. Results showed that D1N1 treatment recorded the highest LAI, PARabs, TDM and RUE. The maximum LAI was obtained 140 DAS (days after sowing) under treatment D1N2 (6.42) and the lowest LAI at the same phase belonged to treatment D2N4 (3.86). At the harvest, the maximum of TDM was 1487 g m-2 recorded under treatment D1N1. The minimum value obtained was 930 g m-2 under treatment D3N4. Also, PARabs was improved under D1N1 and D1N2 treatments. With reduced N application rates and irrigation doses, PARabs was decreased and the lowest values were observed under D3N4 condition. The RUE, varied from 1.55 g MJ-1 (D1N1) to 1.24 g MJ-1 (D3N4), was affected and decreased under deficit irrigation and low nitrogen conditions. In conclusion, the results of this study seem to show that D1N1 and D1N2 treatments can be beneficial for Durum wheat under field conditions in semi arid zone of Tunisia, for the purpose of improving RUE and maximizing grain yield.
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Claims 10
Claim · model-written summary
The D1N1 treatment gave the highest LAI, absorbed PAR and total dry matter in durum wheat.
- Taxon
- Durum Wheat
Triticum turgidum subsp. durumt0 - Treatment
- D1N1e0
- Outcome
- LAI, PARabs, TDMe0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“D1N1 treatment recorded the highest LAI, PARabs, TDM and RUE”
t0“Durum Wheat”
Claim · model-written summary
The D1N1 treatment gave the highest radiation use efficiency in durum wheat.
- Taxon
- Durum WheatTriticum turgidum subsp. durumt0
- Treatment
- D1N1e0
- Outcome
- RUEe0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“D1N1 treatment recorded the highest LAI, PARabs, TDM and RUE”
t0“Durum Wheat”
Claim · model-written summary
The maximum LAI of durum wheat, 6.42, was obtained 140 days after sowing under treatment D1N2.
- Taxon
- Durum WheatTriticum turgidum subsp. durumt0
- Treatment
- D1N2e0
- Outcome
- LAIe0
- Direction
- maximume0
- Value
- 6.42e0
- Qualifier
- 140 DASe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The maximum LAI was obtained 140 DAS (days after sowing) under treatment D1N2 (6.42)”
t0“Durum Wheat”
Claim · model-written summary
The lowest LAI at the same stage, 3.86, belonged to treatment D2N4.
- Taxon
- Durum WheatTriticum turgidum subsp. durumt0
- Treatment
- D2N4e0
- Outcome
- LAIe0
- Direction
- loweste0
- Value
- 3.86e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lowest LAI at the same phase belonged to treatment D2N4 (3.86)”
t0“Durum Wheat”
Claim · model-written summary
At harvest the maximum total dry matter of durum wheat, 1487 g m-2, was recorded under treatment D1N1.
- Taxon
- Durum WheatTriticum turgidum subsp. durumt0
- Treatment
- D1N1e0
- Outcome
- TDMe0
- Direction
- maximume0
- Value
- 1487 g m-2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the harvest, the maximum of TDM was 1487 g m-2 recorded under treatment D1N1”
t0“Durum Wheat”
Claim · model-written summary
The minimum total dry matter of durum wheat, 930 g m-2, was obtained under treatment D3N4.
- Taxon
- Durum WheatTriticum turgidum subsp. durumt0
- Treatment
- D3N4e1
- Outcome
- TDMe0
- Direction
- minimume1
- Value
- 930 g m-2e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the harvest, the maximum of TDM was 1487 g m-2 recorded under treatment D1N1”
e1“The minimum value obtained was 930 g m-2 under treatment D3N4”
t0“Durum Wheat”
Claim · model-written summary
Absorbed photosynthetic active radiation was improved under the D1N1 and D1N2 treatments.
- Taxon
- Durum WheatTriticum turgidum subsp. durumt0
- Treatment
- D1N1 and D1N2e0
- Outcome
- PARabse0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PARabs was improved under D1N1 and D1N2 treatments”
t0“Durum Wheat”
Claim · model-written summary
With reduced N application rates and irrigation doses PARabs decreased, with the lowest values under D3N4.
- Taxon
- Durum WheatTriticum turgidum subsp. durumt0
- Treatment
- reduced N application rates and irrigation dosese0
- Outcome
- PARabse0
- Direction
- decreasede0
- Qualifier
- lowest values were observed under D3N4 conditione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With reduced N application rates and irrigation doses, PARabs was decreased and the lowest values were observed under D3N4 condition”
t0“Durum Wheat”
Claim · model-written summary
RUE of durum wheat varied from 1.55 g MJ-1 under D1N1 to 1.24 g MJ-1 under D3N4 and decreased under deficit irrigation and low nitrogen.
- Taxon
- Durum WheatTriticum turgidum subsp. durumt0
- Treatment
- deficit irrigation and low nitrogen conditionse0
- Outcome
- RUEe0
- Direction
- decreasede0
- Value
- 1.55 g MJ-1 (D1N1) to 1.24 g MJ-1 (D3N4)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The RUE, varied from 1.55 g MJ-1 (D1N1) to 1.24 g MJ-1 (D3N4), was affected and decreased under deficit irrigation and low nitrogen conditions”
t0“Durum Wheat”
Claim · model-written summary
The authors conclude that D1N1 and D1N2 can be beneficial for durum wheat under field conditions in the semi-arid zone of Tunisia, improving RUE and maximizing grain yield.
- Taxon
- Durum WheatTriticum turgidum subsp. durumt0
- Outcome
- improving RUE and maximizing grain yielde0
- Setting
- semi arid zone of Tunisiae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“D1N1 and D1N2 treatments can be beneficial for Durum wheat under field conditions in semi arid zone of Tunisia, for the purpose of improving RUE and maximizing grain yield”
t0“Durum Wheat”
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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.