Abstract
Abstract Water and fertility management practices are needed that will ensure economic crop production on irrigated lands in semi‐arid regions with extremes in drought and salinity. Barley, Hordeum vulgare L., was used as an indicator crop to evaluate the interactive effects of fertilizer (N and P), salinity, and irrigation management on crop yields. Greenhouse experiments with four replications were imposed on a nonsaline nongypsiferous Hunting silty clay loam soil (Aquic Ustifluvent). Nitrogen (0, 112, 224 or 448 kg N/ha) and P (0, 45 or 90 kg P/ha) were applied as urea and calcium superphosphate prior to planting. Six to eight seeds were planted in 576 pots and irrigated with tap water until the plants reached the two‐leaf stage, at which time they were thinned to two plants per pot. Salinity (EC W = 0.5, 1.5> 4.5, or 13.5 mmhos/cm) and water (irrigation interval of 2, 4, or 8 days) management treatments were then initiated. Data were collected on yield components and environmental factors. Regression coefficients (r 3 ) on interactions were low, indicating that a small proportion of the total yield variability was accounted for by the various variables. However, water quality and quantity and N fertilizer interactions exhibited significant (P < 0.01) effects on yield components. Moreover, a negative yield response was produced by decreasing irrigation frequency and increasing water salinity. According to the correlation coefficients, three yield components (main heads, tiller heads, and floret abortion) had comparable effects on yield. In contrast, the path coefficients analysis attributed yield differences to direct and indirect influences of various parameters. Where correlation analysis simply measured mutual association between the various parameters and variables, the path analysis measured the relative importance of each. Although results indicated reduction in yield parameters, if managed correctly, moderately saline water can be used to obtain reasonable (but not maximum) yields. Where maximum yield decisions have to be made, however, better quality land and water should be used for crop production.
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Claims 10
Claim · model-written summary
Regression interactions accounted for a small proportion of barley yield variability.
- Taxon
- Barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- interactionse0
- Outcome
- total yield variabilitye0
- Qualifier
- small proportione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Regression coefficients (r 3 ) on interactions were low, indicating that a small proportion of the total yield variability was accounted for by the various variables.”
t0“Barley”
Claim · model-written summary
Water quality, water quantity and nitrogen fertilizer interactions significantly affected yield components.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- water quality and quantity and N fertilizer interactionse0
- Outcome
- yield componentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water quality and quantity and N fertilizer interactions exhibited significant (P < 0.01) effects on yield components.”
t0“Barley”
Claim · model-written summary
Less frequent irrigation reduced barley yield.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- decreasing irrigation frequencye0
- Outcome
- yield responsee0
- Direction
- negativee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a negative yield response was produced by decreasing irrigation frequency and increasing water salinity.”
t0“Barley”
Claim · model-written summary
Higher salinity reduced barley yield.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- increasing water salinitye0
- Outcome
- yield responsee0
- Direction
- negativee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a negative yield response was produced by decreasing irrigation frequency and increasing water salinity.”
t0“Barley”
Claim · model-written summary
Main heads had an effect on yield comparable to other assessed components.
- Taxon
- BarleyHordeum vulgaret0
- Organ / stage
- main headse0
- Outcome
- yielde0
- Qualifier
- comparable effectse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“three yield components (main heads, tiller heads, and floret abortion) had comparable effects on yield.”
t0“Barley”
Claim · model-written summary
Tiller heads had an effect on yield comparable to other assessed components.
- Taxon
- BarleyHordeum vulgaret0
- Organ / stage
- tiller headse0
- Outcome
- yielde0
- Qualifier
- comparable effectse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“three yield components (main heads, tiller heads, and floret abortion) had comparable effects on yield.”
t0“Barley”
Claim · model-written summary
Floret abortion had an effect on yield comparable to other assessed components.
- Taxon
- BarleyHordeum vulgaret0
- Organ / stage
- floret abortione0
- Outcome
- yielde0
- Qualifier
- comparable effectse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“three yield components (main heads, tiller heads, and floret abortion) had comparable effects on yield.”
t0“Barley”
Claim · model-written summary
Path analysis attributed yield differences to direct and indirect influences of several parameters.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- yield differencese0
- Comparator
- various parameterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the path coefficients analysis attributed yield differences to direct and indirect influences of various parameters.”
t0“Barley”
Claim · model-written summary
Moderately saline water can give reasonable, though not maximum, yields with correct management.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- moderately saline water can be used to obtain reasonable (but not maximum) yieldse0
- Qualifier
- if managed correctlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“if managed correctly, moderately saline water can be used to obtain reasonable (but not maximum) yields.”
t0“Barley”
Claim · model-written summary
Maximum yield decisions call for better quality land and water.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- better quality land and water should be used for crop productione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Where maximum yield decisions have to be made, however, better quality land and water should be used for crop production.”
t0“Barley”
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See all 43 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.