Abstract
Abstract The external and internal S and N requirements of field‐grown sweet corn ( Zea mays ) were investigated. The experimental soil was a Bridgeport fine sandy loam of western Nebraska. It contained 4 ppm extractable sulfate‐S. Irrigation water contained 3 ppm S. Nitrification rate was 14 ppm during 10 days at 25 C. Five N levels (45, 90, 135, 180, and 225 kg/ha as NH 4 NO 3 ) and 3 S levels (0, 22, and 666 kg/ha as gypsum) were arranged factorial combination, randomized block with five replications. Increases in yield from S fertilization were observed at low rates of applied N. Critical levels of S and N in the ear leaf were about 0.24% and 2.9% respectively. Yields were closely associated with N percentage of the ear leaf and N percentage of the ear leaf was increased by both N and S fertilization. When no S was added, 225 kg N/ha was required for maximum yield (13.5 tons), but when 66 kg S/ha was applied, yield was maximum (13.4 tons) at 135 kg N/ha. A case for the usefulness N:S ratios could not be made from the data examined. Sampling at silking stage is probably too late for effective foliar diagnosis of S deficiency in corn. The probability that S was borderline deficient under these conditions suggests that the external requirement for SOM 4 ‐S in the soil solution is about 3 ppm.
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Claims 10
Claim · model-written summary
S fertilization increased sweet corn yield at low rates of applied N.
- Taxon
- sweet corne0
- Treatment
- S fertilizatione1
- Outcome
- yielde1
- Direction
- Increasese1
- Qualifier
- at low rates of applied Ne1
Not reportedComparator
Verbatim
e0“The external and internal S and N requirements of field‐grown sweet corn ( Zea mays ) were investigated”
e1“Increases in yield from S fertilization were observed at low rates of applied N”
Claim · model-written summary
Critical levels of S and N in the ear leaf of sweet corn were about 0.24% for S.
Verbatim
e0“The external and internal S and N requirements of field‐grown sweet corn ( Zea mays ) were investigated”
e2“Critical levels of S and N in the ear leaf were about 0.24% and 2.9% respectively”
Claim · model-written summary
Critical levels of S and N in the ear leaf of sweet corn were about 2.9% for N.
Verbatim
e0“The external and internal S and N requirements of field‐grown sweet corn ( Zea mays ) were investigated”
e2“Critical levels of S and N in the ear leaf were about 0.24% and 2.9% respectively”
Claim · model-written summary
Sweet corn yield was closely associated with the N percentage of the ear leaf.
Not reportedDirection
Verbatim
e0“The external and internal S and N requirements of field‐grown sweet corn ( Zea mays ) were investigated”
e3“Yields were closely associated with N percentage of the ear leaf and N percentage of the ear leaf was increased by both N and S fertilization”
Claim · model-written summary
N and S fertilization increased the N percentage of the sweet corn ear leaf.
- Taxon
- sweet corne0
- Organ / stage
- ear leafe3
- Treatment
- N and S fertilizatione3
- Outcome
- N percentage of the ear leafe3
- Direction
- increasede3
Not reportedComparator
Verbatim
e0“The external and internal S and N requirements of field‐grown sweet corn ( Zea mays ) were investigated”
e3“Yields were closely associated with N percentage of the ear leaf and N percentage of the ear leaf was increased by both N and S fertilization”
Claim · model-written summary
Without S, 225 kg N/ha was required for maximum sweet corn yield of 13.5 tons.
- Taxon
- sweet corne0
- Treatment
- 225 kg N/hae4
- Outcome
- maximum yielde4
- Direction
- maximume4
- Value
- 13.5 tonse4
- Qualifier
- When no S was addede4
Not reportedComparator
Verbatim
e0“The external and internal S and N requirements of field‐grown sweet corn ( Zea mays ) were investigated”
e4“When no S was added, 225 kg N/ha was required for maximum yield (13.5 tons), but when 66 kg S/ha was applied, yield was maximum (13.4 tons) at 135 kg N/ha”
Claim · model-written summary
With 66 kg S/ha, sweet corn yield was maximum at 13.4 tons at 135 kg N/ha.
- Taxon
- sweet corne0
- Treatment
- 66 kg S/hae4
- Outcome
- yielde4
- Direction
- maximume4
- Value
- 13.4 tonse4
- Qualifier
- at 135 kg N/hae4
Not reportedComparator
Verbatim
e0“The external and internal S and N requirements of field‐grown sweet corn ( Zea mays ) were investigated”
e4“When no S was added, 225 kg N/ha was required for maximum yield (13.5 tons), but when 66 kg S/ha was applied, yield was maximum (13.4 tons) at 135 kg N/ha”
Claim · model-written summary
The usefulness of N:S ratios for sweet corn could not be established from the data examined.
Verbatim
e0“The external and internal S and N requirements of field‐grown sweet corn ( Zea mays ) were investigated”
e5“A case for the usefulness N:S ratios could not be made from the data examined”
Claim · model-written summary
Sampling at silking stage is probably too late for effective foliar diagnosis of S deficiency in corn.
- Taxon
- corn
Zea mays subsp. mayse6 - Organ / stage
- silking stagee6
- Outcome
- effective foliar diagnosis of S deficiencye6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“Sampling at silking stage is probably too late for effective foliar diagnosis of S deficiency in corn”
Claim · model-written summary
The external requirement for S in the soil solution of sweet corn is about 3 ppm.
Verbatim
e0“The external and internal S and N requirements of field‐grown sweet corn ( Zea mays ) were investigated”
e7“the external requirement for SOM 4 ‐S in the soil solution is about 3 ppm”
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