Abstract
Abstract Guar [ Cyamopsis tetragonoloba (L.) Taub] is an alternative crop in the Southern High Plains that thrives in semi‐arid regions, due to its low water input requirements. Field experiments were conducted in 2017 and 2018 at New Deal, TX, to evaluate the response of guar (‘Matador’) to four levels of deficit irrigation (DI; extreme, 51 mm; severe, 127 mm; moderate, 203 mm; and mild, 279 mm). Soil moisture extraction patterns, plant height, leaf area index, yield components, seed yield, harvest index (HI), agronomic water use efficiency (AWUE), and irrigation WUE (IWUE) were measured among the irrigation levels. In both years, guar grown under extreme and severe DI extracted a major portion of the water from the 50‐to‐100‐cm soil depth. Water deficit reduced plant height, leaf area index, and number of pods per plant in both years. However, the IWUE and 1,000‐seed weight increased with reduced irrigation. There were no significant differences in seed yield, HI, and AWUE among treatments as a result of a tradeoff between increased seed weight with low pod production under lower DI treatments and increased pod production with low seed weight under higher DI treatments. Guar extracted water deeper in the soil and produced adequate numbers of pods per plant in balance with the source organ capacity to allocate resources toward optimal seed development. Our research offers valuable information about root exploration and development of larger seeds as compensatory mechanisms that can be further explored to improve the adaptability of guar under water‐restricted production conditions.
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Claims 8
Claim · model-written summary
Under extreme and severe deficit irrigation, guar extracted much water from 50 to 100 cm soil depth.
- Taxon
- guar
Cyamopsis tetragonolobae0 - Organ / stage
- soil depthe0
- Treatment
- extreme and severe DIe0
- Outcome
- extracted a major portion of the water from the 50‐to‐100‐cm soil depthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In both years, guar grown under extreme and severe DI extracted a major portion of the water from the 50‐to‐100‐cm soil depth.”
Claim · model-written summary
Water deficit reduced guar plant height and leaf area index in both years.
- Taxon
- GuarCyamopsis tetragonolobat0
- Treatment
- Water deficite0
- Outcome
- plant height, leaf area indexe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficit reduced plant height, leaf area index, and number of pods per plant in both years.”
t0“Guar”
Claim · model-written summary
Water deficit reduced guar pods per plant in both years.
- Taxon
- GuarCyamopsis tetragonolobat0
- Treatment
- Water deficite0
- Outcome
- number of pods per plante0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficit reduced plant height, leaf area index, and number of pods per plant in both years.”
t0“Guar”
Claim · model-written summary
Irrigation water use efficiency increased as irrigation declined.
- Taxon
- GuarCyamopsis tetragonolobat0
- Treatment
- reduced irrigatione0
- Outcome
- IWUEe0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, the IWUE and 1,000‐seed weight increased with reduced irrigation.”
t0“Guar”
Claim · model-written summary
Thousand seed weight increased as irrigation declined.
- Taxon
- GuarCyamopsis tetragonolobat0
- Treatment
- reduced irrigatione0
- Outcome
- 1,000‐seed weighte0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, the IWUE and 1,000‐seed weight increased with reduced irrigation.”
t0“Guar”
Claim · model-written summary
Seed yield, harvest index and agronomic water use efficiency did not differ significantly among irrigation treatments.
- Taxon
- GuarCyamopsis tetragonolobat0
- Treatment
- treatmentse0
- Outcome
- seed yield, HI, and AWUEe0
- Direction
- no significant differencese0
- Comparator
- among treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were no significant differences in seed yield, HI, and AWUE among treatments”
t0“Guar”
Claim · model-written summary
Lower deficit irrigation treatments combined greater seed weight with lower pod production.
- Taxon
- GuarCyamopsis tetragonolobat0
- Treatment
- lower DI treatmentse0
- Outcome
- increased seed weight with low pod productione0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased seed weight with low pod production under lower DI treatments”
t0“Guar”
Claim · model-written summary
Higher deficit irrigation treatments combined greater pod production with lower seed weight.
- Taxon
- GuarCyamopsis tetragonolobat0
- Treatment
- higher DI treatmentse0
- Outcome
- increased pod production with low seed weighte0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased pod production with low seed weight under higher DI treatments”
t0“Guar”
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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.