Abstract
Abstract Solution culture, greenhouse and field experiments were conducted to compare the effect of NH.‐N and NO3,‐N on growth and yield of barley (Hordeum vulgare L.). In a solution culture experiment, barley grew more with NO3, than with NH4, particularly at high N concentrations. The effect was not much altered by buffering the solution pH with CaCO3. In a greenhouse experiment, with 10 soils which received 30 μg N g‐1, barley yields were greater with NO3, than with NH4, when soil pH was less than 6.0. Yield from NH4.‐N, expressed as a % of yield from NO3‐N, correlated well with soil pH (r=0.88**). In another greenhouse experiment, urea or (NH4)2‐SO4, when placed in a band with or without thiourea, remained substantially as NH4, in the soil, and subsequently plant growth was reduced. The field experiments which received N fertilizers in the spring, did not show much difference in grain yield of barley between NH4 and NO, sources. In 16 field experiments on acid soils (pH 4.5 to 5.8), the average grain yield was similar with NH4NO3 and with (NH4)2SO4. In 10 other field experiments on soils with pH values ranging from 6.0 to 8.4, yields were not influenced by N source or addition of nitrification inhibitors to the NH4‐based fertilizers. Because of possibility for loss of NO3‐N through denitrification and leaching, the NH4 form might be preferable in the field.
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Claims 11
Claim · model-written summary
Barley grew more with nitrate than ammonium in solution culture, especially at high nitrogen.
- Taxon
- barley
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Hordeum vulgaree0 - Treatment
- NO3e0
- Outcome
- barley grewe0
- Direction
- moree0
- Qualifier
- high N concentrationse0
- Comparator
- NH4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“barley grew more with NO3, than with NH4, particularly at high N concentrations”
Claim · model-written summary
Buffering solution pH with CaCO3 did not substantially alter the nitrogen source effect.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- buffering the solution pH with CaCO3e0
- Outcome
- The effecte0
- Direction
- not much alterede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The effect was not much altered by buffering the solution pH with CaCO3”
e1“barley grew more with NO3, than with NH4”
Claim · model-written summary
Greenhouse barley yield was greater with nitrate than ammonium below pH 6.0.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- NO3e0
- Outcome
- barley yieldse0
- Direction
- greatere0
- Qualifier
- soil pH was less than 6.0e0
- Comparator
- NH4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“barley yields were greater with NO3, than with NH4, when soil pH was less than 6.0”
Claim · model-written summary
Relative yield under ammonium correlated with soil pH at r=0.88.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- Yield from NH4.‐Ne0
- Value
- r=0.88**e0
- Comparator
- NO3‐Ne0
- Setting
- soil pHe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield from NH4.‐N, expressed as a % of yield from NO3‐N, correlated well with soil pH (r=0.88**)”
e1“barley yields”
Claim · model-written summary
Banded urea or ammonium sulfate remained substantially ammonium in soil.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- urea or (NH4)2‐SO4e0
- Outcome
- remained substantially as NH4, in the soile0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“urea or (NH4)2‐SO4, when placed in a band with or without thiourea, remained substantially as NH4, in the soil”
e1“barley yields”
Claim · model-written summary
Banded ammonium fertilizer subsequently reduced barley growth.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- urea or (NH4)2‐SO4e0
- Outcome
- plant growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“urea or (NH4)2‐SO4, when placed in a band with or without thiourea, remained substantially as NH4, in the soil, and subsequently plant growth was reduced”
e1“barley yields”
Claim · model-written summary
Spring field trials showed little barley grain yield difference between ammonium and nitrate sources.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- NH4e0
- Outcome
- grain yield of barleye0
- Direction
- did not show much differencee0
- Qualifier
- in the springe0
- Comparator
- NOe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The field experiments which received N fertilizers in the spring, did not show much difference in grain yield of barley between NH4 and NO, sources”
Claim · model-written summary
On acid soils, barley grain yield was similar with ammonium nitrate and ammonium sulfate.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- NH4NO3e0
- Outcome
- average grain yielde0
- Direction
- similare0
- Qualifier
- acid soils (pH 4.5 to 5.8)e0
- Comparator
- (NH4)2SO4e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 16 field experiments on acid soils (pH 4.5 to 5.8), the average grain yield was similar with NH4NO3 and with (NH4)2SO4”
e1“barley yields”
Claim · model-written summary
Across soils of pH 6.0 to 8.4, nitrogen source did not influence yields.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- N sourcee0
- Outcome
- yieldse0
- Direction
- not influencede0
- Qualifier
- pH values ranging from 6.0 to 8.4e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 10 other field experiments on soils with pH values ranging from 6.0 to 8.4, yields were not influenced by N source or addition of nitrification inhibitors to the NH4‐based fertilizers”
e1“barley yields”
Claim · model-written summary
Across soils of pH 6.0 to 8.4, nitrification inhibitors did not influence yields.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- addition of nitrification inhibitors to the NH4‐based fertilizerse0
- Outcome
- yieldse0
- Direction
- not influencede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 10 other field experiments on soils with pH values ranging from 6.0 to 8.4, yields were not influenced by N source or addition of nitrification inhibitors to the NH4‐based fertilizers”
e1“barley yields”
Claim · model-written summary
Ammonium nitrogen might be preferable in the field because nitrate may be lost.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- NH4 form might be preferable in the fielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Because of possibility for loss of NO3‐N through denitrification and leaching, the NH4 form might be preferable in the field”
e1“barley yields”
The same questions in other papers
nitrogen · growth · Hordeum vulgare (barley)Results differ
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- no effect
- positive
- positive
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- positive
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See all 550 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.