Abstract
Abstract In an experiment involving corn yield responses to rates of nitrogen fertilizer on artificially exposed Marshall subsoil and normal surface soil, results were obtained in 1958 and 1959 which indicated that equal corn yields could be obtained on either surface or subsoil, provided that adequate nitrogen fertilizer was supplied. Maximum corn yields on both subsoil and normal soils were approximately 100 bushels per acre in 1958 and 125 bushels per acre in 1959. Yields on subsoil control plots (0 N) were 45 to 50 bushels per acre lower than from corresponding surface soil plots. A regression analysis of the data indicated that the production of maximum corn yields on subsoil required 35 more pounds of nitrogen per acre in 1958 and 52 more pounds of nitrogen per acre in 1959 than on normal soil. Nitrogen availability in the untreated surface soil exceeded that in the untreated subsoil by the equivalent of about 70 to 75 pounds of fertilizer nitrogen per acre per year.
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Claims 7
Claim · model-written summary
Equal corn yields could be obtained on surface soil and subsoil when adequate nitrogen fertilizer was supplied.
- Taxon
- corn
Zea mays subsp. mayse1 - Treatment
- adequate nitrogen fertilizere1
- Outcome
- corn yieldse1
- Direction
- equale1
- Comparator
- either surface or subsoile1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“equal corn yields could be obtained on either surface or subsoil, provided that adequate nitrogen fertilizer was supplied”
Claim · model-written summary
Maximum corn yields on subsoil and normal soils were about 100 bushels per acre in 1958.
- Taxon
- cornZea mays subsp. mayse2
- Outcome
- Maximum corn yieldse2
- Value
- approximately 100 bushels per acree2
- Setting
- 1958e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Maximum corn yields on both subsoil and normal soils were approximately 100 bushels per acre in 1958 and 125 bushels per acre in 1959”
Claim · model-written summary
Maximum corn yields on subsoil and normal soils were about 125 bushels per acre in 1959.
- Taxon
- cornZea mays subsp. mayse2
- Outcome
- Maximum corn yieldse2
- Value
- 125 bushels per acree2
- Setting
- 1959e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Maximum corn yields on both subsoil and normal soils were approximately 100 bushels per acre in 1958 and 125 bushels per acre in 1959”
Claim · model-written summary
Corn yields on subsoil control plots without nitrogen were 45 to 50 bushels per acre lower than on corresponding surface soil plots.
- Taxon
- cornZea mays subsp. mayse1
- Treatment
- subsoil control plots (0 N)e3
- Outcome
- Yieldse3
- Direction
- lowere3
- Value
- 45 to 50 bushels per acree3
- Comparator
- corresponding surface soil plotse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“equal corn yields could be obtained on either surface or subsoil, provided that adequate nitrogen fertilizer was supplied”
e3“Yields on subsoil control plots (0 N) were 45 to 50 bushels per acre lower than from corresponding surface soil plots”
Claim · model-written summary
Maximum corn yield on subsoil required 35 more pounds of nitrogen per acre than on normal soil in 1958.
- Taxon
- cornZea mays subsp. mayse4
- Treatment
- nitrogene4
- Outcome
- production of maximum corn yields on subsoile4
- Direction
- moree4
- Value
- 35 more pounds of nitrogen per acree4
- Comparator
- normal soile4
- Setting
- 1958e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“the production of maximum corn yields on subsoil required 35 more pounds of nitrogen per acre in 1958 and 52 more pounds of nitrogen per acre in 1959 than on normal soil”
Claim · model-written summary
Maximum corn yield on subsoil required 52 more pounds of nitrogen per acre than on normal soil in 1959.
- Taxon
- cornZea mays subsp. mayse4
- Treatment
- nitrogene4
- Outcome
- production of maximum corn yields on subsoile4
- Direction
- moree4
- Value
- 52 more pounds of nitrogen per acree4
- Comparator
- normal soile4
- Setting
- 1959e4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“the production of maximum corn yields on subsoil required 35 more pounds of nitrogen per acre in 1958 and 52 more pounds of nitrogen per acre in 1959 than on normal soil”
Claim · model-written summary
Untreated surface soil supplied about 70 to 75 pounds of fertilizer nitrogen per acre per year more available nitrogen than untreated subsoil.
- Taxon
- cornZea mays subsp. mayse1
- Outcome
- Nitrogen availabilitye5
- Direction
- exceedede5
- Value
- 70 to 75 pounds of fertilizer nitrogen per acre per yeare5
- Comparator
- untreated subsoile5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“equal corn yields could be obtained on either surface or subsoil, provided that adequate nitrogen fertilizer was supplied”
e5“Nitrogen availability in the untreated surface soil exceeded that in the untreated subsoil by the equivalent of about 70 to 75 pounds of fertilizer nitrogen per acre per year”
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