Abstract
Seedling damage from excess seed-placed urea fertilizer can be a major problem in one-pass seeding and fertilizing systems. Field studies were conducted on a clay loam and a fine sandy loam soil over 3 yr to evaluate the impact of seed-placed urea N, with and without the addition of the urease inhibitor N-(n-butyl) thiophosphoric triamide (NBPT) on stand density and growth of barley. Seedling damage, as indicated by reduction in stand density, occurred on both soil types at rates of seed-placed N as low as 40 kg N ha −1 . Addition of NBPT to the urea fertilizer increased stand density at N levels where damage occurred with the untreated urea. Dry matter yield at heading generally was unaffected by N application or use of NBPT; however, final yield was increased by use of NBPT in four of five site-years. Use of NBPT appears promising as a method of reducing the risk of seedling damage from seed-placed urea fertilizer, thus increasing the rate of urea-N that can be safely placed with the seed. Key words: Urease inhibitor, seedling toxicity, ammonia
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Claims 6
Claim · model-written summary
Seed-placed N at rates as low as 40 kg N ha −1 reduced barley stand density on both soils.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- seed-placed N as low as 40 kg N ha −1e0
- Outcome
- stand densitye0
- Direction
- reductione0
- Setting
- both soil typese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Seedling damage, as indicated by reduction in stand density, occurred on both soil types at rates of seed-placed N as low as 40 kg N ha −1”
t0“barley”
Claim · model-written summary
Adding NBPT increased barley stand density at N rates where untreated urea caused damage.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- Addition of NBPT to the urea fertilizere0
- Outcome
- stand densitye0
- Direction
- increasede0
- Comparator
- untreated ureae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of NBPT to the urea fertilizer increased stand density at N levels where damage occurred with the untreated urea”
t0“barley”
Claim · model-written summary
N application generally did not significantly change dry matter yield at heading.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- N applicatione0
- Outcome
- Dry matter yield at headinge0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter yield at heading generally was unaffected by N application or use of NBPT”
t0“barley”
Claim · model-written summary
NBPT generally did not significantly change dry matter yield at heading.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- NBPTe0
- Outcome
- Dry matter yield at headinge0
- Direction
- unaffectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Dry matter yield at heading generally was unaffected by N application or use of NBPT”
t0“barley”
Claim · model-written summary
NBPT increased final barley yield in four of five site-years.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- NBPTe0
- Outcome
- final yielde0
- Direction
- increasede0
- Value
- four of five site-yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“final yield was increased by use of NBPT in four of five site-years”
t0“barley”
Claim · model-written summary
NBPT was recommended to lower seedling-damage risk and permit safer seed placement of more urea-N.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- NBPTe0
- Outcome
- reducing the risk of seedling damagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Use of NBPT appears promising as a method of reducing the risk of seedling damage from seed-placed urea fertilizer, thus increasing the rate of urea-N that can be safely placed with the seed”
t0“barley”
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