Abstract
Abstract A 3‐yr study was conducted to examine combination effects of tillage (no‐till, conventional‐till), manure, and inorganic fertilizer (ammonium nitrate) on leaching of nitrates from the root zone of corn ( Zea mays L.). Soil cores were collected every spring to a depth of 210 cm and analyzed for NO 3 ‐N. Leaching of NO 3 ‐N significantly increased as fertilizer N rates increased, especially when rates exceeded the crop's potential to assimilate N. The concentration of soil nitrate (averaged over depth and tillage) in Year 3 of the study under the unfertilized control plots was 2.5 mg NO 3 ‐N kg −1 , whereas the concentration under plots fertilized with 260 kg N ha −1 was 8.7 mg NO 3 ‐N kg −1 . Soil nitrate concentrations were consistently lower under no‐tillage when compared with conventional‐tillage. Tillage differences were greatest when high rates of N were added to soil. These results indicate that the use of no‐tillage cultivation may reduce the leaching of nitrates beyond the crop root zone.
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Claims 6
Claim · model-written summary
Nitrate leaching increased significantly with fertilizer N rate, especially above crop assimilation capacity.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- fertilizer N ratese0
- Outcome
- Leaching of NO 3 ‐Ne0
- Direction
- increasede0
- Qualifier
- rates exceeded the crop's potential to assimilate Ne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaching of NO 3 ‐N significantly increased as fertilizer N rates increased, especially when rates exceeded the crop's potential to assimilate N”
e1“root zone of corn ( Zea mays L.)”
Claim · model-written summary
Year 3 soil nitrate was 2.5 mg NO 3 ‐N kg −1 under unfertilized control plots.
- Taxon
- cornZea mays subsp. mayse2
- Outcome
- soil nitratee1
- Value
- 2.5 mg NO 3 ‐N kg −1e0
- Qualifier
- Year 3e0
- Setting
- unfertilized control plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in Year 3 of the study under the unfertilized control plots was 2.5 mg NO 3 ‐N kg −1”
e1“The concentration of soil nitrate”
e2“root zone of corn ( Zea mays L.)”
Claim · model-written summary
Year 3 soil nitrate was 8.7 mg NO 3 ‐N kg −1 under 260 kg N ha −1 fertilization.
- Taxon
- cornZea mays subsp. mayse2
- Treatment
- 260 kg N ha −1e0
- Outcome
- soil nitratee1
- Value
- 8.7 mg NO 3 ‐N kg −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the concentration under plots fertilized with 260 kg N ha −1 was 8.7 mg NO 3 ‐N kg −1”
e1“The concentration of soil nitrate”
e2“root zone of corn ( Zea mays L.)”
Claim · model-written summary
Soil nitrate was consistently lower under no tillage than conventional tillage.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- no‐tillagee0
- Outcome
- Soil nitrate concentrationse0
- Direction
- lowere0
- Comparator
- conventional‐tillagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil nitrate concentrations were consistently lower under no‐tillage when compared with conventional‐tillage”
e1“root zone of corn ( Zea mays L.)”
Claim · model-written summary
Tillage differences in soil nitrate were greatest at high nitrogen rates.
- Taxon
- cornZea mays subsp. mayse2
- Treatment
- high rates of Ne0
- Outcome
- Tillage differencese0
- Direction
- greateste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tillage differences were greatest when high rates of N were added to soil”
e1“Soil nitrate concentrations”
e2“root zone of corn ( Zea mays L.)”
Claim · model-written summary
The authors conclude no tillage may reduce nitrate leaching beyond the corn root zone.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- no‐tillage cultivatione0
- Qualifier
- may reduce the leaching of nitratese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the use of no‐tillage cultivation may reduce the leaching of nitrates beyond the crop root zone”
e1“root zone of corn ( Zea mays L.)”
The same questions in other papers
tillage · nutrient: content · Zea mays (maize)Positive and negative results
92 papers in the same direction as this paper · 33 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- negative
- negative
123 papers more in this group
See all 127 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.