Abstract
Abstract Little information is presently available on the effects of N source on dryland crop production in the Northern Plains. Therefore a field experiment was conducted for 4 years to assess the relative merits of ammonium sulfate, ammonium nitrate, calcium nitrate, and urea applied annually at 55 and 110 kg N/ha to both corn ( Zea mays , L.) and bromegrass ( Bromus inermis , L.) grown on a fine sandy loam ( pachic haploboroll ) with surface pH of 6.5 and no free carbonates. Plants were harvested at maturity and soils were periodically sampled for water content, inorganic N content, and pH. Corn production was highest for ammonium sulfate and ammonium nitrate at 110 kg N/ha. Leaf tissue at silking from all fertilized corn contained over 2.8% total N. Soil inorganic N accumulating during the first 3 years under corn was leached below the root zone by 514 mm of precipitation during the fourth growing season. At the 110‐kg N rate, bromegrass production was lowest with urea, possibly because of ammonia volatilization. Nitrate sources of N greatly enhanced early season growth of bromegrass. All fertilizer N applied was immobilized in the bromegrass ecosystem, prohibiting any carryover or leaching of soil nitrate. Soil pH changes due to fertilization were not reflected in plant growth.
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Claims 7
Claim · model-written summary
Corn production was highest with ammonium sulfate and ammonium nitrate at 110 kg N/ha.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- ammonium sulfate and ammonium nitrate at 110 kg N/hae1
- Outcome
- Corn productione1
- Direction
- higheste1
- Setting
- Northern Plainse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dryland crop production in the Northern Plains”
e1“Corn production was highest for ammonium sulfate and ammonium nitrate at 110 kg N/ha”
t0“Corn”
Claim · model-written summary
Leaf tissue at silking of fertilized corn contained over 2.8% total N.
- Taxon
- CornZea mays subsp. mayst0
- Organ / stage
- Leaf tissue at silkinge2
- Outcome
- total Ne2
- Value
- over 2.8%e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Leaf tissue at silking from all fertilized corn contained over 2.8% total N”
t0“Corn”
Claim · model-written summary
Soil inorganic N accumulated under corn during the first 3 years was leached below the root zone during the fourth growing season.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- Soil inorganic Ne3
- Direction
- leached below the root zonee3
- Qualifier
- by 514 mm of precipitation during the fourth growing seasone3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Soil inorganic N accumulating during the first 3 years under corn was leached below the root zone by 514 mm of precipitation during the fourth growing season”
t0“Corn”
Claim · model-written summary
Bromegrass production was lowest with urea, possibly because of ammonia volatilization.
- Taxon
- bromegrass productione4
- Treatment
- ureae4
- Outcome
- bromegrass productione4
- Direction
- loweste4
- Qualifier
- possibly because of ammonia volatilizatione4
Not reportedComparator
Verbatim
e4“bromegrass production was lowest with urea, possibly because of ammonia volatilization”
t0“Corn”
Claim · model-written summary
Nitrate sources of N greatly enhanced early season growth of bromegrass.
- Taxon
- bromegrasse5
- Treatment
- Nitrate sources of Ne5
- Outcome
- early season growthe5
- Direction
- greatly enhancede5
Not reportedComparator
Verbatim
e5“Nitrate sources of N greatly enhanced early season growth of bromegrass”
t0“Corn”
Claim · model-written summary
All fertilizer N applied to bromegrass was immobilized in the ecosystem, with no carryover or leaching of soil nitrate.
Verbatim
e6“All fertilizer N applied was immobilized in the bromegrass ecosystem, prohibiting any carryover or leaching of soil nitrate”
t0“Corn”
Claim · model-written summary
Soil pH changes due to fertilization were not reflected in plant growth.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- plant growthe7
- Qualifier
- Soil pH changes due to fertilization were not reflectede7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Soil pH changes due to fertilization were not reflected in plant growth”
t0“Corn”
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