Abstract
ABSTRACT Hydrogels favor moisture retention in the substrate and can attenuate the effects of salt stress on the production of potted plants. In this context, this research sought to evaluate the use of hydrogel to mitigate the damage caused by the salinity of irrigation water on the emergence, growth, and thermal index of Tagetes patula L. seedlings. The research was carried out in a greenhouse, in September 2020, in the municipality of Fortaleza, Ceará State, Brazil. The design used was randomized blocks in a split plot. The plots corresponded to seven levels of electrical conductivity of the irrigation water - ECw (0.5, 1.0, 2.0, 3.0, 4.0, 5.0, and 6.0 dS m-1) and the subplots corresponded to four hydrogel concentrations (0, 1.0, 2.0, and 3.0 g L-1), with five replicates and each subplot consisted of 27 seeds. The application of 3.0 g hydrogel L-1 of substrate favored the production of leaves and reduced the thermal index in plants associated with the increase in the salinity of the substrate up to 6.0 dS m-1. The use of 3.0 g L-1 hydrogel increases seedling height, leaf dry mass, and total dry mass compared to treatments without water-retaining polymer, even at moderate (2.0 to 3.0 dS m-1) and high (4.0 to 6.0 dS m-1) salinity levels, thus indicating a possible effect of mitigation of damage caused by the salinity of the irrigation water. However, the intensity of this mitigating effect decreases at higher levels of salt stress.
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Claims 4
Claim · model-written summary
At up to 6.0 dS m-1 salinity, 3.0 g hydrogel L-1 favored leaf production.
- Taxon
- Tagetes patula L.
.jpg?width=60)
Tagetes patulae1 - Treatment
- 3.0 g hydrogel L-1 of substratee0
- Outcome
- production of leavese0
- Direction
- favorede0
- Qualifier
- up to 6.0 dS m-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“The application of 3.0 g hydrogel L-1 of substrate favored the production of leaves and reduced the thermal index in plants associated with the increase in the salinity of the substrate up to 6.0 dS m-1.”
e1“Tagetes patula L. seedlings”
Claim · model-written summary
At up to 6.0 dS m-1 salinity, 3.0 g hydrogel L-1 reduced thermal index.
- Taxon
- Tagetes patula L.Tagetes patulae1
- Treatment
- 3.0 g hydrogel L-1 of substratee0
- Outcome
- thermal indexe0
- Direction
- reducede0
- Qualifier
- up to 6.0 dS m-1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 3.0 g hydrogel L-1 of substrate favored the production of leaves and reduced the thermal index in plants associated with the increase in the salinity of the substrate up to 6.0 dS m-1.”
e1“Tagetes patula L. seedlings”
Claim · model-written summary
At moderate and high salinity, hydrogel increased seedling height, leaf dry mass, and total dry mass compared with no polymer.
- Taxon
- Tagetes patula L.Tagetes patulae1
- Treatment
- 3.0 g L-1 hydrogele0
- Outcome
- seedling height, leaf dry mass, and total dry masse0
- Direction
- increasese0
- Qualifier
- moderate (2.0 to 3.0 dS m-1) and high (4.0 to 6.0 dS m-1) salinity levelse0
- Comparator
- treatments without water-retaining polymere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of 3.0 g L-1 hydrogel increases seedling height, leaf dry mass, and total dry mass compared to treatments without water-retaining polymer, even at moderate (2.0 to 3.0 dS m-1) and high (4.0 to 6.0 dS m-1) salinity levels”
e1“Tagetes patula L. seedlings”
Claim · model-written summary
Hydrogel mitigation weakened at higher salt stress levels.
- Taxon
- Tagetes patula L.Tagetes patulae1
- Treatment
- salt stresse0
- Outcome
- intensity of this mitigating effecte0
- Direction
- decreasese0
- Qualifier
- higher levelse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, the intensity of this mitigating effect decreases at higher levels of salt stress.”
e1“Tagetes patula L. seedlings”
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