Abstract
Abstract Crops are affected by fluctuations in the water table by seasonal rainfall and soil submergence during growth. A better understanding of their response will help us to optimize drainage and irrigation. Response of irrigated corn to (i) four static water‐table depths (60, 90, 120, and 150 cm) as affected by the growing‐season rainfall and (ii) single or repeated submergence for 1 to 6 days was studied in 58 cm diam by 183‐cm long metal barrels using silt loam soil during 1971 and 1972. Crop response to water‐table depths varied with rainfall during growth. In a wet year, water table at the 120 cm depth gave the highest and that at the 60 cm depth the lowest yield. In a relatively dry year, yield was highest with water tables at 60 and 90 cm depths and decreased with deeper water tables.” It is indicated that a water table at 120 cm depth is desirable for corn. A multiple regression equation indicated that soil water depletion from the upper 30 cm before irrigation, ground water contribution, and oxygen diffusion rate at 15 cm depth accounted for 79% of the variation in yields across water tables. In both years, N, P, and K concentrations in grain and stover were not significantly affected by water table treatments. Grain yields were reduced significantly by submergence exceeding 1 day. For comparable durations, yield reductions were smaller for single than repeated submergence. Submergence during early growth was more harmful than during late growth. Prolonged soil submergence significantly reduced N, P, and K concentrations in the grain. For optimum corn production it is necessary to drain excess water from the root zone within 1 day of soil submergence.
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Claims 12
Claim · model-written summary
In a wet year, the 120 cm water table gave the highest corn yield.
- Taxon
- Corn
Zea mays subsp. mayst0 - Treatment
- water table at the 120 cm depthe0
- Outcome
- yielde0
- Direction
- higheste0
- Qualifier
- In a wet yeare0
- Comparator
- that at the 60 cm depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Yield and Nutrient Uptake”
e0“In a wet year, water table at the 120 cm depth gave the highest and that at the 60 cm depth the lowest yield”
Claim · model-written summary
In a wet year, the 60 cm water table gave the lowest corn yield.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- the 60 cm depthe0
- Outcome
- yielde0
- Direction
- loweste0
- Qualifier
- In a wet yeare0
- Comparator
- the 120 cm depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Yield and Nutrient Uptake”
e0“In a wet year, water table at the 120 cm depth gave the highest and that at the 60 cm depth the lowest yield”
Claim · model-written summary
In a relatively dry year, corn yield decreased with deeper water tables.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- deeper water tablese1
- Outcome
- yielde1
- Direction
- decreasede1
- Qualifier
- In a relatively dry yeare1
- Comparator
- water tables at 60 and 90 cm depthse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Yield and Nutrient Uptake”
e1“In a relatively dry year, yield was highest with water tables at 60 and 90 cm depths and decreased with deeper water tables”
Claim · model-written summary
In a relatively dry year, corn yield was highest with water tables at 60 and 90 cm depths.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- water tables at 60 and 90 cm depthse1
- Outcome
- yielde1
- Direction
- higheste1
- Qualifier
- In a relatively dry yeare1
- Comparator
- deeper water tablese1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Yield and Nutrient Uptake”
e1“In a relatively dry year, yield was highest with water tables at 60 and 90 cm depths and decreased with deeper water tables”
Claim · model-written summary
A water table at 120 cm depth is desirable for corn.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- water table at 120 cm depthe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Yield and Nutrient Uptake”
e2“It is indicated that a water table at 120 cm depth is desirable for corn”
Claim · model-written summary
Soil water depletion from the upper 30 cm before irrigation, ground water contribution and oxygen diffusion rate at 15 cm depth accounted for 79% of the variation in corn yields across water tables.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- soil water depletion from the upper 30 cm before irrigatione3
- Outcome
- variation in yieldse3
- Value
- 79%e3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Yield and Nutrient Uptake”
e3“A multiple regression equation indicated that soil water depletion from the upper 30 cm before irrigation, ground water contribution, and oxygen diffusion rate at 15 cm depth accounted for 79% of the variation in yields across water tables”
Claim · model-written summary
N, P and K concentrations in corn grain and stover were not significantly affected by water-table treatments.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- water table treatmentse4
- Outcome
- N, P, and K concentrations in grain and stovere4
- Direction
- no_changeinferrede4
- Qualifier
- In both yearse4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Yield and Nutrient Uptake”
e4“In both years, N, P, and K concentrations in grain and stover were not significantly affected by water table treatments”
Claim · model-written summary
Grain yields of corn were significantly reduced by submergence exceeding 1 day.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- submergence exceeding 1 daye5
- Outcome
- Grain yieldse5
- Direction
- reducede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Yield and Nutrient Uptake”
e5“Grain yields were reduced significantly by submergence exceeding 1 day”
Claim · model-written summary
For comparable durations, yield reductions were smaller for single than for repeated submergence.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- repeated submergencee6
- Outcome
- yield reductionse6
- Direction
- smallere6
- Qualifier
- For comparable durationse6
- Comparator
- singlee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Yield and Nutrient Uptake”
e6“For comparable durations, yield reductions were smaller for single than repeated submergence”
Claim · model-written summary
Submergence during early growth was more harmful to corn than during late growth.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Submergence during early growthe7
- Outcome
- harmfule7
- Direction
- higherinferrede7
- Comparator
- during late growthe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Yield and Nutrient Uptake”
e7“Submergence during early growth was more harmful than during late growth”
Claim · model-written summary
Prolonged soil submergence significantly reduced N, P and K concentrations in corn grain.
- Taxon
- CornZea mays subsp. mayst0
- Treatment
- Prolonged soil submergencee7
- Outcome
- N, P, and K concentrations in the graine7
- Direction
- reducede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Yield and Nutrient Uptake”
e7“Prolonged soil submergence significantly reduced N, P, and K concentrations in the grain”
Claim · model-written summary
For optimum corn production, excess water should be drained from the root zone within 1 day of soil submergence.
- Taxon
- CornZea mays subsp. mayst0
- Outcome
- drain excess water from the root zone within 1 day of soil submergencee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Corn Yield and Nutrient Uptake”
e1“For optimum corn production it is necessary to drain excess water from the root zone within 1 day of soil submergence”
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