Abstract
Abstract Yields, N uptake, and apparent recovery of applied N were determined for seven harvests of orchardgrass in the growth chamber following one surface application of several sources of N applied at rates of 56, 112, 225, and 450 mg of N per pot. Apparent recovery of N from the various sources decreased in the following order: coated (dicyclopentadiene copolymer) urea (75%) = ammonium nitrate (74%) > thiourea (690/0) > oxamide‐fine (65%) = oxamide −8 +14 (65%) > urea plus thiourea (63%) > hexamine (59%) > glycoluril (49%) > urea formaldehyde (41%) > ammonium salt of oxidized nitrogenenriched coal (39%). Yield and N uptake in the first harvest were greatest with ammoniumn itrate, urea, urea plus thiourea, and finely divided oxamide. Glycoluril and coated urea produced the highest yields and N uptake in the second and third harvests. In the later stages of cropping, yields and N uptake from the urea‐formaldehyde and thiourea treatments increased and, in the final four harvests, the results obtained with these two sources were among the highest. Thiourea depressed yield of orchardgrass when applied at the 450 mg of N rate. However, the yield of this treatment was still much greater than that of the control.
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Claims 7
Claim · model-written summary
Apparent N recovery ranked coated urea and ammonium nitrate highest at 75% and 74%, then thiourea, oxamide, urea plus thiourea, hexamine, glycoluril, urea formaldehyde and oxidized coal salt.
- Taxon
- orchardgrass
.jpg?width=60)
Dactylis glomeratat0 - Outcome
- Apparent recovery of Ne0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Apparent recovery of N from the various sources decreased in the following order: coated (dicyclopentadiene copolymer) urea (75%) = ammonium nitrate (74%) > thiourea (690/0) > oxamide‐fine (65%) = oxamide −8 +14 (65%) > urea plus thiourea (63%) > hexamine (59%) > glycoluril (49%) > urea formaldehyde (41%) > ammonium salt of oxidized nitrogenenriched coal (39%)”
t0“Orchardgrass”
Claim · model-written summary
Ammonium nitrate, urea, urea plus thiourea and fine oxamide gave the greatest first-harvest yield and N uptake.
- Taxon
- orchardgrassDactylis glomeratat0
- Treatment
- finely divided oxamidee0
- Outcome
- Yield and N uptakee0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield and N uptake in the first harvest were greatest with ammoniumn itrate, urea, urea plus thiourea, and finely divided oxamide”
t0“Orchardgrass”
Claim · model-written summary
Glycoluril gave the highest yield and N uptake in the second and third harvests.
- Taxon
- orchardgrassDactylis glomeratat0
- Treatment
- Glycolurile0
- Outcome
- yields and N uptakee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glycoluril and coated urea produced the highest yields and N uptake in the second and third harvests”
t0“Orchardgrass”
Claim · model-written summary
Coated urea gave the highest yield and N uptake in the second and third harvests.
- Taxon
- orchardgrassDactylis glomeratat0
- Treatment
- coated ureae0
- Outcome
- yields and N uptakee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Glycoluril and coated urea produced the highest yields and N uptake in the second and third harvests”
t0“Orchardgrass”
Claim · model-written summary
Urea-formaldehyde yield and N uptake increased later, ranking among the highest in the final four harvests.
- Taxon
- orchardgrassDactylis glomeratat0
- Treatment
- urea‐formaldehydee0
- Outcome
- yields and N uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yields and N uptake from the urea‐formaldehyde and thiourea treatments increased and, in the final four harvests, the results obtained with these two sources were among the highest”
t0“Orchardgrass”
Claim · model-written summary
Thiourea yield and N uptake increased later, ranking among the highest in the final four harvests.
- Taxon
- orchardgrassDactylis glomeratat0
- Treatment
- thioureae0
- Outcome
- yields and N uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“yields and N uptake from the urea‐formaldehyde and thiourea treatments increased and, in the final four harvests, the results obtained with these two sources were among the highest”
t0“Orchardgrass”
Claim · model-written summary
Thiourea at 450 mg N depressed orchardgrass yield, though it remained above control.
- Taxon
- orchardgrassDactylis glomeratae0
- Treatment
- Thioureae0
- Outcome
- yield of orchardgrasse0
- Direction
- depressede0
- Qualifier
- 450 mg of N ratee0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Thiourea depressed yield of orchardgrass when applied at the 450 mg of N rate. However, the yield of this treatment was still much greater than that of the control”
The same questions in other papers
nitrogen · yield · Dactylis glomerata (cocksfoot)Positive and negative results
14 papers in the same direction as this paper · 2 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- no effect
- no effect
14 papers more in this group
See all 18 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.