Abstract
Abstract Without irrigation, crop yields are usually water‐limited on the acid soils of the southeastern USA. Economically feasible irrigation systems that require less water are needed. As part of a feasibility study of subsurface microirrigation for corn ( Zea mays L.) production, the effects of irrigation line spacing and irrigation water amount were investigated in a 5‐yr study at Suffolk, VA. The soil was a Uchee loamy sand (loamy, siliceous, thermic Arenic Hapludult) with inclusions of Emporia loamy sand (fine‐loamy, siliceous, thermic Typic Hapludult). Treatments were three line spacings (0.91, 1.82, and 2.74 in apart, buried 0.38 m below and parallel to the crop row), low and high water amounts (about 41 and 62% of average pan evaporation, respectively), and a nonirrigated control. Nonirrigated grain yields ranged from 3.12 Mg ha −1 (1987) to 9.73 Mg ha −1 (1989). Irrigated grain yields ranged from 8.27 to 12.02 Mg ha −1 . Except for 1987 (the driest year), there was no significant difference between the low and high water application amounts. In 1987, corn irrigated with the higher rate yielded 34% more. Grain yields were highest with irrigation lines placed under each row (narrow spacing) and ranged from a low of 8.55 Mg ha −1 (wide spacing) in 1989 to a high of 12.25 Mg ha −1 (narrow spacing) in 1990. Increased amounts of irrigation water were needed with the wider line spacing to obtain corn grain yields comparable with the other two spacings. It is unlikely that the lowered yield or increased irrigation water required with wide line spacing could offset additional installation costs for the narrow spacing. Irrigation lines spaced in alternate corn row middles (1.83 m) or under the third row (2.74 m) are recommended.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Nonirrigated corn yields ranged from 3.12 to 9.73 Mg ha −1.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Nonirrigatede1
- Outcome
- grain yieldse1
- Value
- 3.12 Mg ha −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“Nonirrigated grain yields ranged from 3.12 Mg ha −1 (1987) to 9.73 Mg ha −1 (1989)”
Claim · model-written summary
Irrigated corn yields ranged from 8.27 to 12.02 Mg ha −1.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Irrigatede1
- Outcome
- grain yieldse1
- Value
- 8.27 to 12.02 Mg ha −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“Irrigated grain yields ranged from 8.27 to 12.02 Mg ha −1”
Claim · model-written summary
Low and high water amounts did not differ significantly except in 1987.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- lowe1
- Outcome
- significant differencee1
- Direction
- no significant differencee1
- Qualifier
- Except for 1987 (the driest year)e1
- Comparator
- high water application amountse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“Except for 1987 (the driest year), there was no significant difference between the low and high water application amounts”
Claim · model-written summary
In 1987, higher irrigation produced 34% more corn yield.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- higher ratee1
- Outcome
- yieldede1
- Direction
- moree1
- Value
- 34%e1
- Qualifier
- In 1987e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“In 1987, corn irrigated with the higher rate yielded 34% more”
Claim · model-written summary
Narrow line spacing gave the highest grain yields.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- irrigation lines placed under each rowe1
- Outcome
- Grain yieldse1
- Direction
- higheste1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“Grain yields were highest with irrigation lines placed under each row (narrow spacing)”
Claim · model-written summary
Wide spacing produced 8.55 Mg ha −1 in 1989.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- wide spacinge1
- Outcome
- 8.55 Mg ha −1e1
- Value
- 8.55 Mg ha −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“8.55 Mg ha −1 (wide spacing) in 1989”
Claim · model-written summary
Narrow spacing produced 12.25 Mg ha −1 in 1990.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- narrow spacinge1
- Outcome
- 12.25 Mg ha −1e1
- Value
- 12.25 Mg ha −1e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“12.25 Mg ha −1 (narrow spacing) in 1990”
Claim · model-written summary
Wider line spacing required more irrigation water to match yields at other spacings.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- wider line spacinge1
- Outcome
- amounts of irrigation watere1
- Direction
- Increasede1
- Comparator
- other two spacingse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“Increased amounts of irrigation water were needed with the wider line spacing to obtain corn grain yields comparable with the other two spacings”
Claim · model-written summary
The authors recommend alternate-row or third-row irrigation line spacing.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- Irrigation lines spaced in alternate corn row middles (1.83 m) or under the third row (2.74 m)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn ( Zea mays L.)”
e1“Irrigation lines spaced in alternate corn row middles (1.83 m) or under the third row (2.74 m) are recommended”
The same questions in other papers
irrigation · yield · Zea mays (maize)Positive and negative results
790 papers in the same direction as this paper · 209 in the opposite direction · 16 reporting no difference from an alternative
- negative
- positive
- positive
1,012 papers more in this group
See all 1,016 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.