Abstract
Abstract. Selection of optimal crops and cropping systems for most efficient water use specific for local environments can improve global water security. Limited irrigation with ground water is one alternative to alleviate crops from low amount or unevenly distributed water in the growing seasons in semi-arid regions. The main objectives of this research were to quantify yield-water use relationships of three limited irrigated crops, determine effect of crop selection on profitability with limited irrigation, and identify profitable and alternative crop production systems. A field study was conducted at the Kansas State University Southwest Research-Extension Center near Tribune, Kansas, from 2012 through 2017. There were four treatments in the study, two 1-yr systems of continuous corn ( L.) (C-C) and continuous grain sorghum (L.) (GS-GS) and two 2-yr rotations of corn-grain sorghum (C-GS) and corn-winter wheat ( L.) (C-W). Overall corn yield after wheat (C-W) was about 1.4 Mg (ha) -1 greater than C-C. Corn and sorghum yields were similar grown as monoculture or in rotation with each other. Available soil water at corn planting and during the growing season were 20 to 40 mm (240 cm profile -1 ) less in the C-GS rotation compared with C-C and C-W rotations. Corn yield increased as water use (yield-water use) increased in C-W rotation but yield-water use relationships tended to be negative in C-C and C-GS rotations. Grain sorghum yield increased with water use in both rotations but at a greater rate in GS-GS compared with C-GS. Despite greater corn grain yield in C-W, our economic analysis showed that wheat was the least profitable of the three crops causing the C-W rotation to be least profitable. In this study, the most profitable limited irrigation crop rotation was corn-grain sorghum (C-GS). Keywords: Corn-sorghum-wheat, Crop rotation, Limited irrigation, Profitability, Supplementary irrigation, Sustainability.
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Claims 9
Claim · model-written summary
Corn after wheat yielded about 1.4 Mg (ha) -1 more than continuous corn.
- Taxon
- corn
Zea mays subsp. mayse0 - Treatment
- C-We0
- Outcome
- corn yielde0
- Direction
- greatere0
- Value
- 1.4 Mg (ha) -1e0
- Comparator
- C-Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“corn yield after wheat (C-W) was about 1.4 Mg (ha) -1 greater than C-C”
Claim · model-written summary
Corn and sorghum yields were similar under monoculture and their rotations.
- Taxon
- Corn and sorghum
SorghumZea mays subsp. mayse0 - Outcome
- yieldse0
- Direction
- similare0
- Comparator
- monoculture or in rotation with each othere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn and sorghum yields were similar grown as monoculture or in rotation with each other”
Claim · model-written summary
Soil water in C-GS was 20 to 40 mm less than C-C and C-W.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- C-GS rotatione0
- Outcome
- Available soil watere0
- Direction
- lesse0
- Value
- 20 to 40 mme0
- Comparator
- C-C and C-W rotationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Available soil water at corn planting and during the growing season were 20 to 40 mm (240 cm profile -1 ) less in the C-GS rotation compared with C-C and C-W rotations”
Claim · model-written summary
Corn yield rose with water use in C-W.
- Taxon
- CornZea mays subsp. mayse0
- Outcome
- Corn yielde0
- Direction
- increasede0
- Qualifier
- water usee0
- Setting
- C-W rotatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn yield increased as water use (yield-water use) increased in C-W rotation”
Claim · model-written summary
Corn yield versus water use tended to be negative in C-C and C-GS.
- Taxon
- CornZea mays subsp. mayse0
- Outcome
- yield-water use relationshipse0
- Direction
- negativee0
- Setting
- C-C and C-GS rotationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Corn yield increased as water use (yield-water use) increased in C-W rotation but yield-water use relationships tended to be negative in C-C and C-GS rotations”
Claim · model-written summary
Sorghum yield increased with water use in both rotations, faster in GS-GS.
- Taxon
- Grain sorghum
Sorghum bicolore0 - Outcome
- Grain sorghum yielde0
- Direction
- increasede0
- Comparator
- C-GSe0
- Setting
- GS-GSe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain sorghum yield increased with water use in both rotations but at a greater rate in GS-GS compared with C-GS”
Claim · model-written summary
Wheat was the least profitable crop.
- Taxon
- wheat
Triticum aestivume0 - Outcome
- least profitablee0
- Direction
- least profitablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wheat was the least profitable of the three crops”
Claim · model-written summary
C-W was the least profitable rotation.
- Taxon
- cornZea mays subsp. mayse0
- Outcome
- least profitablee0
- Direction
- least profitablee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Despite greater corn grain yield in C-W, our economic analysis showed that wheat was the least profitable of the three crops causing the C-W rotation to be least profitable”
Claim · model-written summary
C-GS was the most profitable limited irrigation rotation.
Verbatim
e0“most profitable limited irrigation crop rotation was corn-grain sorghum (C-GS)”
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