Abstract
Abstract In a greenhouse experiment with wheat, sandy loam or clay soils were salinized by additions of 0, 3. or 8 g NaCl/3L pot. Ammonium and nitrate nitrogen mixtures in ratios of 0/100, 25/75 and 50/50 together with DCD, a nitrification inhibitor, were applied with irrigation water. Salinity significantly reduced dry matter yields, and N and P content in grain and stover. In accordance with previous reports, a mixed ammonium and nitrate N source produced larger dry matter and protein yields than nitrate alone, particularly in grains. The relative increases in yields and N and P accumulation, due to mixed N nutrition, were significantly higher in salinized soils and increased with increasing proportions of ammonium. Grain dry matter and N yields at medium salinity with a 50/50 N mixture, were equal to, or higher than those in non‐salinized soil fertilized with nitrate only. Chloride concentrations in stover increased with salinity and proportion of ammonium in the mixed source indicating that the advantage of mixed N nutrition is not due to nitrate‐chloride antagonism. Sodium concentration in plant tissues increased with salinity, but was reduced by increasing proportions of ammonium in the medium. This effect may be attributed to competition between ammonium and sodium for root uptake sites. The results obtained emphasize the effectiveness of mixed N sources to increase salt tolerance of crops such as wheat.
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Claims 12
Claim · model-written summary
Salinity significantly reduced wheat dry matter yields.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- Salinitye0
- Outcome
- dry matter yieldse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity significantly reduced dry matter yields, and N and P content in grain and stover”
t0“wheat”
Claim · model-written summary
Salinity significantly reduced N and P content in grain and stover.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Salinitye0
- Outcome
- N and P content in grain and stovere0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity significantly reduced dry matter yields, and N and P content in grain and stover”
t0“wheat”
Claim · model-written summary
Mixed ammonium nitrate produced larger dry matter yield than nitrate alone, particularly in grain.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- mixed ammonium and nitrate N sourcee0
- Outcome
- dry mattere0
- Direction
- largere0
- Qualifier
- particularly in grainse0
- Comparator
- nitrate alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a mixed ammonium and nitrate N source produced larger dry matter and protein yields than nitrate alone, particularly in grains”
t0“wheat”
Claim · model-written summary
Mixed ammonium nitrate produced larger protein yield than nitrate alone, particularly in grain.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- mixed ammonium and nitrate N sourcee0
- Outcome
- protein yieldse0
- Direction
- largere0
- Qualifier
- particularly in grainse0
- Comparator
- nitrate alonee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a mixed ammonium and nitrate N source produced larger dry matter and protein yields than nitrate alone, particularly in grains”
t0“wheat”
Claim · model-written summary
Mixed-N yield gains were greater in saline soils and with more ammonium.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- mixed N nutritione0
- Outcome
- relative increases in yieldse0
- Direction
- highere0
- Setting
- salinized soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative increases in yields and N and P accumulation, due to mixed N nutrition, were significantly higher in salinized soils and increased with increasing proportions of ammonium”
t0“wheat”
Claim · model-written summary
Mixed-N N and P accumulation gains were greater in saline soils and with more ammonium.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- mixed N nutritione0
- Outcome
- N and P accumulatione0
- Direction
- highere0
- Setting
- salinized soilse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relative increases in yields and N and P accumulation, due to mixed N nutrition, were significantly higher in salinized soils and increased with increasing proportions of ammonium”
t0“wheat”
Claim · model-written summary
At medium salinity, 50/50 N yielded grain dry matter equal to or above nitrate-only nonsaline soil.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 50/50 N mixturee0
- Outcome
- Grain dry mattere0
- Direction
- equal to, or highere0
- Comparator
- non‐salinized soil fertilized with nitrate onlye0
- Setting
- medium salinitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain dry matter and N yields at medium salinity with a 50/50 N mixture, were equal to, or higher than those in non‐salinized soil fertilized with nitrate only”
t0“wheat”
Claim · model-written summary
At medium salinity, 50/50 N yielded grain N equal to or above nitrate-only nonsaline soil.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- 50/50 N mixturee0
- Outcome
- N yieldse0
- Direction
- equal to, or highere0
- Comparator
- non‐salinized soil fertilized with nitrate onlye0
- Setting
- medium salinitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain dry matter and N yields at medium salinity with a 50/50 N mixture, were equal to, or higher than those in non‐salinized soil fertilized with nitrate only”
t0“wheat”
Claim · model-written summary
Stover chloride increased with salinity and ammonium proportion.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- salinity and proportion of ammoniume0
- Outcome
- Chloride concentrations in stovere0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chloride concentrations in stover increased with salinity and proportion of ammonium in the mixed source”
t0“wheat”
Claim · model-written summary
Plant tissue sodium increased with salinity.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- salinitye0
- Outcome
- Sodium concentration in plant tissuese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sodium concentration in plant tissues increased with salinity”
t0“wheat”
Claim · model-written summary
More ammonium reduced plant tissue sodium.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- increasing proportions of ammoniume0
- Outcome
- Sodium concentration in plant tissuese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sodium concentration in plant tissues increased with salinity, but was reduced by increasing proportions of ammonium in the medium”
t0“wheat”
Claim · model-written summary
The authors attribute lower sodium to competition between ammonium and sodium for root uptake sites.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- This effecte0
- Qualifier
- competition between ammonium and sodium for root uptake sitese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This effect may be attributed to competition between ammonium and sodium for root uptake sites”
t0“wheat”
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