Abstract
There is no consensus on how much N can be applied to plants under salt stress. In our research we tested the hypothesis that such response depends on salt tolerance of the plant species. So, this study aimed to evaluate the uses and losses of N by cotton (salt-tolerant) and maize (moderately salt-sensitive) irrigated with waters of different electrical conductivity (0.5, 2.0, 4.0, and 6.0 dS m−1) and fertilized with nitrogen (60, 100, and 140% of the recommended dose for each crop). We found that nitrogen doses beyond the recommended values exacerbated the negative effects of salinity on growth and photosynthetic rates, especially in maize plants growing under moderate to high salinity. N rates over the recommended dose did not increase leaf nitrogenous compounds, believed to attenuate the negative impacts of salt stress. Our results indicate that the responses to additional nitrogen fertilization depend on crop salt tolerance and on the level of saline stress imposed. Increasing N rates beyond crop needs under salinity only increased leaching losses and reduced the nitrogen-use efficiency, indicating that such practice would result in economic losses and environmental N overload, especially when a supplemental dose is applied to a salt-sensitive crop.
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Claims 6
Claim · model-written summary
Nitrogen doses beyond the recommended values exacerbated the negative effects of salinity on growth and photosynthetic rates, especially in maize under moderate to high salinity.
- Taxon
- maize and cotton plants
Gossypium hirsutum
Zea mayst0 - Treatment
- nitrogen doses beyond the recommended valuese0
- Outcome
- growth and photosynthetic ratese0
- Direction
- exacerbatede0
- Qualifier
- especially in maize plants growing under moderate to high salinitye0
- Comparator
- recommended valuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“nitrogen doses beyond the recommended values exacerbated the negative effects of salinity on growth and photosynthetic rates, especially in maize plants growing under moderate to high salinity”
t0“maize and cotton plants”
Claim · model-written summary
N rates over the recommended dose did not increase leaf nitrogenous compounds.
- Taxon
- maize and cotton plantsGossypium hirsutumZea mayst0
- Treatment
- N rates over the recommended dosee0
- Outcome
- leaf nitrogenous compoundse0
- Direction
- did not increasee0
- Comparator
- recommended dosee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N rates over the recommended dose did not increase leaf nitrogenous compounds”
t0“maize and cotton plants”
Claim · model-written summary
Responses to additional nitrogen fertilization depend on crop salt tolerance and on the level of saline stress.
- Taxon
- maize and cotton plantsGossypium hirsutumZea mayst0
- Treatment
- level of saline stresse0
- Outcome
- responses to additional nitrogen fertilizatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the responses to additional nitrogen fertilization depend on crop salt tolerance and on the level of saline stress imposed”
t0“maize and cotton plants”
Claim · model-written summary
Increasing N rates beyond crop needs under salinity increased leaching losses.
- Taxon
- maize and cotton plantsGossypium hirsutumZea mayst0
- Treatment
- Increasing N rates beyond crop needse0
- Outcome
- leaching lossese0
- Direction
- increasede0
- Qualifier
- under salinitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N rates beyond crop needs under salinity only increased leaching losses and reduced the nitrogen-use efficiency”
t0“maize and cotton plants”
Claim · model-written summary
Increasing N rates beyond crop needs under salinity reduced nitrogen-use efficiency.
- Taxon
- maize and cotton plantsGossypium hirsutumZea mayst0
- Treatment
- Increasing N rates beyond crop needse0
- Outcome
- nitrogen-use efficiencye0
- Direction
- reducede0
- Qualifier
- under salinitye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing N rates beyond crop needs under salinity only increased leaching losses and reduced the nitrogen-use efficiency”
t0“maize and cotton plants”
Claim · model-written summary
The authors conclude that supplying N beyond crop needs under salinity would cause economic losses and environmental N overload, especially for a salt-sensitive crop.
- Taxon
- maize and cotton plantsGossypium hirsutumZea mayst0
- Outcome
- economic losses and environmental N overloade0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“such practice would result in economic losses and environmental N overload, especially when a supplemental dose is applied to a salt-sensitive crop”
t0“maize and cotton plants”
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