Abstract
Abstract During the period 1977–1979, NaNO3, urea, and urea plus 2% (wt/wt) nitrapyrin (2‐chloro‐6‐(trimethyl)pyridine) were compared on a Matapeake silt loam (fine silty mixed mesic Typic Hapludult) . Nitrogen sources were injected as solutions into the water system at 224 kg N ha‐1yr‐1used for subsurface trickle irrigation of corn (Zea maysL.). Nitrogen was withheld in 1980 in order to assess residual N effects. Grain yields in 1980 for the NaNO3, urea, and urea plus Nitrapyrin treatments were 5.10, 4.56 and 6.52 Mg ha‐1, respectively. Corresponding ear leaf N concentrations were 17.7, 16.7 and 19.2 g kg‐1. Significantly higher grain yield and leaf N concentrations associated with the use of nitrapyrin as a nitrification inhibitor indicated greater soil N reserves for this treatment. Non‐exchangeable (fixed) NH4 +, in soil cores taken in November 1981 averaged 54, 59 and 74 ug N g‐1for the respective N regimes. The concentration of fixed NH4 +increased with sampling depth, averaging 54, 61 and 72 ug N g‐1for the 0–5, 30–35, and 60–65 cm profile depths, respectively. This trend is ascribed to increasing quantities of micaceous and vermiculitic clay (<2 um) with increasing profile depth. Key words: Nitrogen fixationNitrification inhibitors
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Claims 5
Claim · model-written summary
Urea plus nitrapyrin gave significantly higher corn grain yield than urea or NaNO3.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- use of nitrapyrin as a nitrification inhibitore1
- Outcome
- grain yielde1
- Direction
- highere1
- Value
- 6.52e3
- Comparator
- NaNO3, ureae3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“used for subsurface trickle irrigation of corn (Zea maysL.)”
e1“Significantly higher grain yield and leaf N concentrations associated with the use of nitrapyrin as a nitrification inhibitor”
e3“Grain yields in 1980 for the NaNO3, urea, and urea plus Nitrapyrin treatments were 5.10, 4.56 and 6.52”
Claim · model-written summary
Urea plus nitrapyrin gave significantly higher ear leaf N concentrations than urea or NaNO3.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- use of nitrapyrin as a nitrification inhibitore1
- Outcome
- leaf N concentrationse1
- Direction
- highere1
- Value
- 19.2e4
- Comparator
- NaNO3, ureae3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“used for subsurface trickle irrigation of corn (Zea maysL.)”
e1“Significantly higher grain yield and leaf N concentrations associated with the use of nitrapyrin as a nitrification inhibitor”
e3“Grain yields in 1980 for the NaNO3, urea, and urea plus Nitrapyrin treatments were 5.10, 4.56 and 6.52”
e4“Corresponding ear leaf N concentrations were 17.7, 16.7 and 19.2”
Claim · model-written summary
Fixed NH4 + in soil cores averaged 54, 59 and 74 µg N g-1 for the NaNO3, urea and urea plus nitrapyrin regimes.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- (fixed) NH4 +e5
- Value
- 54, 59 and 74e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“used for subsurface trickle irrigation of corn (Zea maysL.)”
e5“(fixed) NH4 +, in soil cores taken in November 1981 averaged 54, 59 and 74”
Claim · model-written summary
Fixed NH4 + increased with sampling depth, averaging 54, 61 and 72 at the three depths.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- concentration of fixed NH4e6
- Direction
- increasede6
- Value
- 54, 61 and 72e6
- Qualifier
- with sampling depthe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“used for subsurface trickle irrigation of corn (Zea maysL.)”
e6“The concentration of fixed NH4 +increased with sampling depth, averaging 54, 61 and 72”
Claim · model-written summary
The authors ascribe the depth trend in fixed NH4 + to increasing micaceous and vermiculitic clay with depth.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- concentration of fixed NH4e6
- Qualifier
- increasing quantities of micaceous and vermiculitic claye7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“used for subsurface trickle irrigation of corn (Zea maysL.)”
e6“The concentration of fixed NH4 +increased with sampling depth, averaging 54, 61 and 72”
e7“This trend is ascribed to increasing quantities of micaceous and vermiculitic clay”
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