Abstract
The synergistic action between K and N (NO3-) favors the absorption of both ions by plants. A suitable combination of these macronutrients may be an alternative capable of alleviating the nutritional imbalance due to the excessive absorption of chloride and sodium by the plant and inhibitory competition between nitrate and potassium. In addition, it can favor the control of the turgidity of the cells, through the osmoregulation, elevate the synthesis of organic solutes, promoting the ionic homeostase, and consequently decrease the effect saline stress on the plants. In this context, this study aimed to evaluate the gas exchanges and growth of sesame cv. BRS G4 as a function of irrigation with water of increasing electrical conductivity (ECw) and fertilization with different combinations of nitrogen (N) and potassium (K). This experiment was conducted under greenhouse conditions. Treatments were distributed in randomized blocks and analyzed in 5 x 4 factorial scheme, consisting of five levels of ECw (0.6; 1.2; 1.8; 2.4 and 3.0 dS m-1) and four combinations of N and K: N/K2O (70/50; 100/75; 130/100 and 160/125% of the recommendation for pot experiments), with three replicates, totaling 60 experimental units. Except for the ECw level of 0.6 dS m-1, the other salt concentrations evaluated in this study compromised the gas exchanges and consequently growth of sesame cv. BRS G4, at 50 days after sowing. Fertilization with N and K in the combination of 70/50% of the recommendation of N/K2O led to the greatest growth of sesame cv. BRS G4. The N/K2O combinations of 130/100, 160/125 and 160/125% reduced the negative effects of saline irrigation of 1.2, 1.8 and 2.4 dS m-1, respectively, on the stomatal conductance of sesame plants. The combined supply of N and K2O in combinations of 100/75, 130/100 and 130/100% promoted higher CO2 assimilation rate in sesame plants using water of 1.2 and 1.8 and 2.4 dS m-1, respectively.
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Claims 9
Claim · model-written summary
Saline irrigation above 0.6 dS m-1 compromised sesame gas exchange at 50 days after sowing.
- Taxon
- sesame
Sesamum indicume0 - Material
- BRS G4e0
- Treatment
- other salt concentrationse0
- Outcome
- gas exchangese0
- Direction
- compromisede0
- Qualifier
- 50 days after sowinge0
- Comparator
- ECw level of 0.6 dS m-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except for the ECw level of 0.6 dS m-1, the other salt concentrations evaluated in this study compromised the gas exchanges and consequently growth of sesame cv. BRS G4, at 50 days after sowing”
Claim · model-written summary
Saline irrigation above 0.6 dS m-1 compromised sesame growth at 50 days after sowing.
- Taxon
- sesameSesamum indicume0
- Material
- BRS G4e0
- Treatment
- other salt concentrationse0
- Outcome
- growthe0
- Direction
- compromisede0
- Qualifier
- 50 days after sowinge0
- Comparator
- ECw level of 0.6 dS m-1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Except for the ECw level of 0.6 dS m-1, the other salt concentrations evaluated in this study compromised the gas exchanges and consequently growth of sesame cv. BRS G4, at 50 days after sowing”
Claim · model-written summary
The 70/50% N/K2O recommendation produced the greatest sesame growth.
- Taxon
- sesameSesamum indicume0
- Material
- BRS G4e0
- Treatment
- 70/50% of the recommendation of N/K2Oe0
- Outcome
- growthe0
- Direction
- greateste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fertilization with N and K in the combination of 70/50% of the recommendation of N/K2O led to the greatest growth of sesame cv. BRS G4”
Claim · model-written summary
130/100% N/K2O reduced salinity effects on stomatal conductance at 1.2 dS m-1.
- Taxon
- sesameSesamum indicume0
- Treatment
- 130/100e0
- Outcome
- stomatal conductancee0
- Direction
- reducede0
- Qualifier
- 1.2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N/K2O combinations of 130/100, 160/125 and 160/125% reduced the negative effects of saline irrigation of 1.2, 1.8 and 2.4 dS m-1, respectively, on the stomatal conductance of sesame plants”
Claim · model-written summary
160/125% N/K2O reduced salinity effects on stomatal conductance at 1.8 dS m-1.
- Taxon
- sesameSesamum indicume0
- Treatment
- 160/125e0
- Outcome
- stomatal conductancee0
- Direction
- reducede0
- Qualifier
- 1.8e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N/K2O combinations of 130/100, 160/125 and 160/125% reduced the negative effects of saline irrigation of 1.2, 1.8 and 2.4 dS m-1, respectively, on the stomatal conductance of sesame plants”
Claim · model-written summary
160/125%% N/K2O reduced salinity effects on stomatal conductance at 2.4 dS m-1.
- Taxon
- sesameSesamum indicume0
- Treatment
- 160/125%e0
- Outcome
- stomatal conductancee0
- Direction
- reducede0
- Qualifier
- 2.4e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N/K2O combinations of 130/100, 160/125 and 160/125% reduced the negative effects of saline irrigation of 1.2, 1.8 and 2.4 dS m-1, respectively, on the stomatal conductance of sesame plants”
Claim · model-written summary
100/75% N/K2O increased sesame CO2 assimilation at 1.2 dS m-1.
- Taxon
- sesameSesamum indicume0
- Treatment
- 100/75e0
- Outcome
- CO2 assimilation ratee0
- Direction
- highere0
- Qualifier
- 1.2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combined supply of N and K2O in combinations of 100/75, 130/100 and 130/100% promoted higher CO2 assimilation rate in sesame plants using water of 1.2 and 1.8 and 2.4 dS m-1, respectively”
Claim · model-written summary
130/100% N/K2O increased sesame CO2 assimilation at 1.8 dS m-1.
- Taxon
- sesameSesamum indicume0
- Treatment
- 130/100e0
- Outcome
- CO2 assimilation ratee0
- Direction
- highere0
- Qualifier
- 1.8e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combined supply of N and K2O in combinations of 100/75, 130/100 and 130/100% promoted higher CO2 assimilation rate in sesame plants using water of 1.2 and 1.8 and 2.4 dS m-1, respectively”
Claim · model-written summary
130/100%% N/K2O increased sesame CO2 assimilation at 2.4 dS m-1.
- Taxon
- sesameSesamum indicume0
- Treatment
- 130/100%e0
- Outcome
- CO2 assimilation ratee0
- Direction
- highere0
- Qualifier
- 2.4e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combined supply of N and K2O in combinations of 100/75, 130/100 and 130/100% promoted higher CO2 assimilation rate in sesame plants using water of 1.2 and 1.8 and 2.4 dS m-1, respectively”
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See all 26 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.