Abstract
Of the numerous factors affecting crop yield, the major factor for corn and soybean in the southeastern CoastalPlain appears to be available soil water. Inadequate rainfall and soil compaction, which limits root exploration of stored soilwater, exacerbate this problem. Potential solutions, though costly and energy intensive, include irrigation and annual deeptillage. Sometimes, doing both provides additive yield increases for corn. The objectives of this study were: (1) to prove asitespecific irrigation system, and (2) to test the separate and combined effects of irrigation, tillage, Nfertilizer, and croprotation on corn and soybean yield. A centerpivot irrigation system that had been modified to allow variablerate water andnutrient applications to 100m 2 plots within the system was used to manage an experiment with cornsoybean rotation,irrigation, deep tillage, and Nfertilizer treatments during 19951998. The modified centerpivot system satisfactorilyapplied water and N fertilizer to the treatment areas, and reliability of the control system improved during this experiment.Irrigation increased corn yield all years (8% to 135%) and soybean yield three of four years (26% to 31%). Deep tillageincreased yield in only two years, for corn (4% to 6%). For these soil and weather conditions, irrigation increased corn andsoybean yields more consistently than deep tillage. The sitespecific irrigation facility performed as expected and shouldprovide the research infrastructure to answer many longstanding questions about irrigated cropping systems in thesoutheastern Coastal Plain.
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Claims 7
Claim · model-written summary
The modified system satisfactorily applied water and nitrogen fertilizer.
- Outcome
- satisfactorilyapplied water and N fertilizere0
Not reportedComparatorValue
Verbatim
e0“The modified centerpivot system satisfactorilyapplied water and N fertilizer to the treatment areas”
Claim · model-written summary
Control-system reliability improved during the experiment.
Not reportedComparatorValue
Verbatim
e0“reliability of the control system improved during this experiment”
Claim · model-written summary
Irrigation increased corn yield in all years by 8% to 135%.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- Irrigatione0
- Outcome
- corn yielde0
- Direction
- increasede0
- Value
- 8% to 135%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation increased corn yield all years (8% to 135%)”
Claim · model-written summary
Irrigation increased soybean yield in three of four years by 26% to 31%.
- Taxon
- soybean
Glycine maxe0 - Outcome
- soybean yielde0
- Value
- 26% to 31%e0
Not reportedTreatmentComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soybean yield three of four years (26% to 31%)”
Claim · model-written summary
Deep tillage increased corn yield in two years by 4% to 6%.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Deep tillagee0
- Outcome
- yielde0
- Direction
- increasede0
- Value
- 4% to 6%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Deep tillageincreased yield in only two years, for corn (4% to 6%)”
Claim · model-written summary
Irrigation increased corn and soybean yields more consistently than deep tillage.
Verbatim
e0“irrigation increased corn andsoybean yields more consistently than deep tillage”
Claim · model-written summary
The site-specific irrigation facility performed as expected.
- Outcome
- performed as expectede0
Not reportedComparatorValue
Verbatim
e0“The sitespecific irrigation facility performed as expected”
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irrigation · yield · Zea mays (maize)Positive and negative results
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- negative
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811 papers in the same direction as this paper · 230 in the opposite direction · 57 reporting no difference from an alternative
- no effect
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See all 1,099 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.