Abstract
Over the last several years, there has been increasing interest in amending the soil using cover crops, especially in desert agriculture. One cover crop of interest in the desert Coachella Valley of California is cowpea [ Vigna unguiculata (L.) Walp.]. Cowpea is particularly useful in that as an excellent cover crop, fixing abundant amounts of nitrogen which can reduce fertilizer costs. However, soil salinity problems are of increasing concern in the Coachella Valley of California where the Colorado River water is a major source of irrigation water. Unfortunately, little information is available on the response of cowpea growth to salt stress. Thus, we investigated the growth response of 12 major cowpea cultivars (`CB5', `CB27', `CB46', `IT89KD-288', `IT93K-503-1', `Iron Clay', `Speckled Purple Hall', `UCR 134', `UCR 671', `UCR 730', `8517', and `7964') to increasing salinity levels. The experiment was set up as a standard Split Plot design. Seven salinity levels ranging from 2.6 to 20.1 dS·m –1 were constructed, based on Colorado River water salt composition, to have NaCl, CaCl2 and MgSO4 as the salinization salts. The osmotic potential ranged from –0.075 to –0.82 MPa. Salt stress began 7 days after planting by adding the salts into irrigating nutrient solution and ended after 5 consecutive days. The plants were harvested during flowering period for biomass measurement (53 days after planting). Data analysis using SAS analysis of variance indicated that the salinity in the range between 2.6 and 20.1 dS·m –1 significantly reduced leaf area, leaf dry weight, stem dry weight and root dry weight ( P ≤ 0.05). We applied the data to a salt-tolerance model, log(Y) = a 1 + a 2 X + a 3 X 2 , where Y represents biomass, a 1 , a 2 and a 3 are empirical constants, and X represents salinity, and found that the model accounted for 99%, 97%, 96%, 99%, and 96% of salt effect for cowpea shoot, leaf area, leaf dry weight, stem dry weight and root dry weight, respectively. We also found significant differences ( P ≤ 0.05) of each biomass parameter among the 12 cultivars and obtained different sets of the empirical constants to quantitatively describe the response of each biomass parameter to salinity for individual cowpea cultivars. Since a significant salt × cultivar interaction effect ( P ≤ 0.05) was found on leaf area and leaf dry weight, we concluded that salt tolerance differences exist among the tested cultivars.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Salinity significantly reduced cowpea leaf area, leaf dry weight and stem dry weight.
- Taxon
- cowpea
Vigna unguiculatat0 - Treatment
- salinity in the range between 2.6 and 20.1 dS·m –1e0
- Outcome
- leaf area, leaf dry weight, stem dry weighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salinity in the range between 2.6 and 20.1 dS·m –1 significantly reduced leaf area, leaf dry weight, stem dry weight and root dry weight ( P ≤ 0.05)”
t0“cowpea [ Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
Salinity significantly reduced cowpea root dry weight.
- Taxon
- cowpeaVigna unguiculatat0
- Treatment
- salinity in the range between 2.6 and 20.1 dS·m –1e0
- Outcome
- root dry weighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salinity in the range between 2.6 and 20.1 dS·m –1 significantly reduced leaf area, leaf dry weight, stem dry weight and root dry weight ( P ≤ 0.05)”
t0“cowpea [ Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
The salt-tolerance model accounted for 99% of the salinity effect on cowpea shoot.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- shoote0
- Value
- 99%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the model accounted for 99%, 97%, 96%, 99%, and 96% of salt effect for cowpea shoot, leaf area, leaf dry weight, stem dry weight and root dry weight, respectively”
Claim · model-written summary
The salt-tolerance model accounted for 97% of the salinity effect on cowpea leaf area.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- leaf areae0
- Value
- 97%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the model accounted for 99%, 97%, 96%, 99%, and 96% of salt effect for cowpea shoot, leaf area, leaf dry weight, stem dry weight and root dry weight, respectively”
Claim · model-written summary
The salt-tolerance model accounted for 96% of the salinity effect on cowpea leaf dry weight.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- leaf dry weighte0
- Value
- 96%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the model accounted for 99%, 97%, 96%, 99%, and 96% of salt effect for cowpea shoot, leaf area, leaf dry weight, stem dry weight and root dry weight, respectively”
Claim · model-written summary
The salt-tolerance model accounted for 99% of the salinity effect on cowpea stem dry weight.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- stem dry weighte0
- Value
- 99%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the model accounted for 99%, 97%, 96%, 99%, and 96% of salt effect for cowpea shoot, leaf area, leaf dry weight, stem dry weight and root dry weight, respectively”
Claim · model-written summary
The salt-tolerance model accounted for 96% of the salinity effect on cowpea root dry weight.
- Taxon
- cowpeaVigna unguiculatae0
- Outcome
- root dry weighte0
- Value
- 96%e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the model accounted for 99%, 97%, 96%, 99%, and 96% of salt effect for cowpea shoot, leaf area, leaf dry weight, stem dry weight and root dry weight, respectively”
Claim · model-written summary
Biomass parameters differed significantly among the 12 cultivars.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- 12 cultivarse0
- Outcome
- biomass parametere0
- Direction
- differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant differences ( P ≤ 0.05) of each biomass parameter among the 12 cultivars”
t0“cowpea [ Vigna unguiculata (L.) Walp.]”
Claim · model-written summary
Salt tolerance differed among the tested cultivars, with a significant salt-by-cultivar interaction for leaf area and leaf dry weight.
- Taxon
- cowpeaVigna unguiculatat0
- Material
- tested cultivarse0
- Treatment
- salte0
- Outcome
- leaf area and leaf dry weighte0
- Direction
- differencese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant salt × cultivar interaction effect ( P ≤ 0.05) was found on leaf area and leaf dry weight, we concluded that salt tolerance differences exist among the tested cultivars”
t0“cowpea [ Vigna unguiculata (L.) Walp.]”
The same questions in other papers
salinity · growth · Vigna unguiculata (cowpea)Results differ
56 papers in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
59 papers more in this group
See all 63 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.