Abstract
A two-year study was initiated in the spring of 1990 on a Keith silt loam soil (Aridic Argiustoll) in northwestKansas to determine the optimum dripline lateral spacing for irrigated corn (Zea mays L.) using subsurface driplinesinstalled at a depth of 40-45 cm in a direction parallel to the corn rows. Average corn yields were 13.6, 12.8, and12.2 Mg/ha for dripline spacings of 1.5, 2.3, and 3.0 m, respectively, for a seasonal-irrigation amount of 462 mm. Yieldsdecreased to 10.8 and 9.3 Mg/ha when irrigation was reduced by 33 and 50% for the wider 2.3- and 3.0-m driplinespacings, respectively. The wider dripline spacings resulted in nonuniform horizontal distribution of available soil water.As a result, yields decreased with horizontal distance from the dripline. The highest yield, highest water use efficiency,and lowest year-to-year variation were obtained with the 1.5 m dripline spacing. An economic analysis indicated thatbecause yield reductions were so great, the wider dripline spacings would be justified only at very high dripline costs andor very low corn grain prices.
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Claims 8
Claim · model-written summary
Corn yield at 1.5 m spacing was 13.6 Mg/ha.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- 1.5e0
- Outcome
- corn yieldse0
- Value
- 13.6e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average corn yields were 13.6, 12.8, and12.2 Mg/ha for dripline spacings of 1.5, 2.3, and 3.0 m, respectively”
Claim · model-written summary
Corn yield at 2.3 m spacing was 12.8 Mg/ha.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- 2.3e0
- Outcome
- corn yieldse0
- Value
- 12.8e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average corn yields were 13.6, 12.8, and12.2 Mg/ha for dripline spacings of 1.5, 2.3, and 3.0 m, respectively”
Claim · model-written summary
Corn yield at 3.0 m spacing was 12.2 Mg/ha.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- 3.0 me0
- Outcome
- corn yieldse0
- Value
- 12.2 Mg/hae0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average corn yields were 13.6, 12.8, and12.2 Mg/ha for dripline spacings of 1.5, 2.3, and 3.0 m, respectively”
Claim · model-written summary
Reducing irrigation by 33% decreased yield to 10.8 Mg/ha.
Not reportedTaxonComparator
Verbatim
e0“Yieldsdecreased to 10.8 and 9.3 Mg/ha when irrigation was reduced by 33 and 50%”
Claim · model-written summary
Reducing irrigation by 50% decreased yield to 9.3 Mg/ha.
Not reportedTaxonComparator
Verbatim
e0“Yieldsdecreased to 10.8 and 9.3 Mg/ha when irrigation was reduced by 33 and 50%”
Claim · model-written summary
Wider spacing made horizontal available soil water distribution nonuniform.
- Treatment
- wider dripline spacingse0
- Outcome
- nonuniform horizontal distribution of available soil watere0
Not reportedTaxonComparatorDirection
Verbatim
e0“The wider dripline spacings resulted in nonuniform horizontal distribution of available soil water.”
Claim · model-written summary
Yield decreased with distance from the dripline.
Not reportedTaxon
Verbatim
e0“yields decreased with horizontal distance from the dripline.”
Claim · model-written summary
The 1.5 m spacing gave the highest yield and water use efficiency and lowest year to year variation.
- Treatment
- 1.5 m dripline spacinge0
- Outcome
- highest yield, highest water use efficiency,and lowest year-to-year variatione0
- Direction
- higheste0
Not reportedTaxonComparator
Verbatim
e0“The highest yield, highest water use efficiency,and lowest year-to-year variation were obtained with the 1.5 m dripline spacing.”
The same questions in other papers
density · physiology: water · Zea mays (maize)Positive and negative results
23 papers in the same direction as this paper · 4 in the opposite direction
- positive
- no effect
- negative
24 papers more in this group
See all 28 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.