Abstract
Improving corn ( L.) furrow irrigation efficiency with proper irrigation scheduling will help conserve dwindling ground water resources in the Mississippi Delta. The objective of this study was to develop irrigation initiation recommendations for corn grown on a deep silty clay loam (SiCL) soils with and without deep tillage. Studies were conducted during the 2009, 2010, 2011, and 2012 growing seasons on a Dundee (fine-silty, mixed, active, thermic Typic Endoaqualfs) /Forestdale (fine, smetitic, thermic Typic Endoaqualfs) silty clay loam in the Mississippi Delta. Furrow irrigation was initiated at multiple timings with corn yield and net returns being later determined. Soil water potential (SWP), soil water deficit (SWD), and growth stage were compared at these initiation timings to determine which parameter or combination of parameters consistently predicted the greatest yields and net returns. Deep tillage increased irrigated yield three out of four years with no interaction between the main effects of tillage and irrigation initiation indicating there was no justification for different irrigation scheduling recommendations with (DT) or without deep tillage (NDT). Irrigation that provided adequate moisture from tasseling to physiological maturity maximized yields and net returns all four years of the study. Results indicated furrow irrigations on this soil should be initiated at the V15-V16 growth stage (3-5 days before VT) or later, when SWP readings are -50 kPa or drier or when SWD estimates are 100 mm or lower and rainfall is not imminent. These results reinforce the sensitivity of corn to drought stress during tasseling, silking, and pollination, and the need to ensure that water is not limiting as the corn enters into this critical time period.
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Claims 6
Claim · model-written summary
Deep tillage increased irrigated corn yield in three of four years.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- Deep tillagee0
- Outcome
- irrigated yielde0
- Direction
- increasede0
- Qualifier
- three out of four yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Deep tillage increased irrigated yield three out of four years”
Claim · model-written summary
Tillage and irrigation initiation did not interact.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- no interaction between the main effects of tillage and irrigation initiatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“no interaction between the main effects of tillage and irrigation initiation”
Claim · model-written summary
Irrigation providing adequate moisture from tasseling to physiological maturity maximized corn yields.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Irrigation that provided adequate moisture from tasseling to physiological maturitye0
- Outcome
- yieldse0
- Direction
- maximizede0
- Qualifier
- all four yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Irrigation that provided adequate moisture from tasseling to physiological maturity maximized yields and net returns all four years of the study”
Claim · model-written summary
Irrigation providing adequate moisture from tasseling to physiological maturity maximized net returns.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Irrigation that provided adequate moisture from tasseling to physiological maturitye0
- Outcome
- net returnse0
- Direction
- maximizede0
- Qualifier
- all four yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“Irrigation that provided adequate moisture from tasseling to physiological maturity maximized yields and net returns all four years of the study”
Claim · model-written summary
The authors recommend initiating furrow irrigation at V15-V16 or later under the stated soil moisture and rain conditions.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- furrow irrigations on this soil should be initiated at the V15-V16 growth stage (3-5 days before VT) or latere0
- Qualifier
- when SWP readings are -50 kPa or drier or when SWD estimates are 100 mm or lower and rainfall is not imminente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“furrow irrigations on this soil should be initiated at the V15-V16 growth stage (3-5 days before VT) or later, when SWP readings are -50 kPa or drier or when SWD estimates are 100 mm or lower and rainfall is not imminent”
Claim · model-written summary
Separate irrigation scheduling recommendations for deep-tilled and non-deep-tilled corn were judged unnecessary.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- no justification for different irrigation scheduling recommendationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn”
e0“there was no justification for different irrigation scheduling recommendations with (DT) or without deep tillage (NDT)”
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