Abstract
There are over 1.0 million ha of cultivated land in the Southern High Plains of Texas, with about 40% in dryland production. Strategies that couple dryland production methods with very low levels of supplemental irrigation in contrast to current irrigated practices could stabilize crop output for an extended period at the expense of reduced agricultural productivity. An eight-year field experiment was conducted from 2001 to 2008 to develop cropping data for economic analysis. The principle goal was to compare a cotton (Gossypium hirsute L.) - sorghum [Sorghum bicolor (L.) Moench] (2:1) rotation system to a continuous cotton system, both efficiently irrigated at levels well below the evapotranspiration rate of these crops. Seasonal irrigation capacities were approximately 0%, 20%, and 40% of peak evapotranspiration rates. The rotation strategy from 2003 to 2005 allowed the movement of limited irrigation between crops based on relative water needs at critical growth periods, and from 2006 to 2008, based on water needs of the crop with the higher economic value. The results showed that in years of below average rain, cotton following sorghum resulted in 18% to 44% higher lint yields compared to continuous cotton. In years of average rain, cotton lint yields following grain sorghum were generally higher than those of continuous cotton, averaging 21%, with a portion of the increase due to higher irrigation. And, in years of above average rain, significant yield differences due to rotation were minimal, particularly at the highest irrigation capacity. Directing available irrigation to the crop of higher value (cotton) at the expense of the lower value crop (sorghum) appeared to be a major factor in elevating seasonal irrigation water use efficiency (0.448 to 0.513 kg lint m-3) compared to irrigating the most water stressed crop (0.200 to 0.35 kg lint m-3). Although cotton lint yield tended to be higher in the rotation than the continuous cotton treatments, the rotation resulted in significantly lower gross irrigation value than the continuous cotton cropping system in most years.
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Claims 5
Claim · model-written summary
In years of below average rain, cotton following sorghum gave 18% to 44% higher lint yields than continuous cotton.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- cotton following sorghume0
- Outcome
- lint yieldse0
- Direction
- highere0
- Value
- 18% to 44%e0
- Qualifier
- in years of below average raine0
- Comparator
- continuous cottone0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in years of below average rain, cotton following sorghum resulted in 18% to 44% higher lint yields compared to continuous cotton”
Claim · model-written summary
In years of average rain, cotton lint yields following grain sorghum were generally higher than continuous cotton, by 21% on average.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- following grain sorghume1
- Outcome
- cotton lint yieldse1
- Direction
- generally highere1
- Value
- 21%e1
- Qualifier
- years of average raine1
- Comparator
- continuous cottone1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“In years of average rain, cotton lint yields following grain sorghum were generally higher than those of continuous cotton, averaging 21%”
Claim · model-written summary
In years of above average rain, yield differences due to rotation were minimal.
- Taxon
- CottonGossypium hirsutumt0
- Treatment
- rotatione2
- Outcome
- yield differencese2
- Direction
- no_changeinferrede2
- Qualifier
- in years of above average raine2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“in years of above average rain, significant yield differences due to rotation were minimal, particularly at the highest irrigation capacity”
t0“Cotton-Grain Sorghum Rotation”
Claim · model-written summary
Directing irrigation to cotton rather than to the most water-stressed crop raised seasonal irrigation water use efficiency to 0.448 to 0.513 kg lint m-3, against 0.200 to 0.35 kg lint m-3.
- Taxon
- cottonGossypium hirsutume3
- Treatment
- Directing available irrigation to the crop of higher valuee3
- Outcome
- seasonal irrigation water use efficiencye3
- Direction
- elevatinge3
- Value
- 0.448 to 0.513 kg lint m-3e3
- Qualifier
- 0.200 to 0.35 kg lint m-3e3
- Comparator
- irrigating the most water stressed crope3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Directing available irrigation to the crop of higher value (cotton) at the expense of the lower value crop (sorghum) appeared to be a major factor in elevating seasonal irrigation water use efficiency (0.448 to 0.513 kg lint m-3) compared to irrigating the most water stressed crop (0.200 to 0.35 kg lint m-3)”
Claim · model-written summary
The cotton-sorghum rotation significantly lowered gross irrigation value compared with continuous cotton in most years.
- Taxon
- cottonGossypium hirsutume4
- Treatment
- rotatione4
- Outcome
- gross irrigation valuee4
- Direction
- lowere4
- Qualifier
- in most yearse4
- Comparator
- continuous cotton cropping systeme4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“the rotation resulted in significantly lower gross irrigation value than the continuous cotton cropping system in most years”
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See all 131 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.