Abstract
The highest-priced aromatic Hom Mali rice is grown on saline soil in Northeast Thailand. The rice variety Khao Dawk Mali 105 (KDML 105), the main variety grown to produce Hom Mali rice was evaluated for yield, the aromatic compound 2-acetyl-1-pyrroline (2 AP) and softness texture at different levels of sodium chloride (NaCl) salt added to the soil. The rice was grown in wetland culture pots with soil made saline by adding 0 g NaCl/kg, 1.16 g NaCl/kg, 1.74 g NaCl/kg, 2.31 g NaCl/kg and 2.89 g NaCl/kg soil which had electrical conductivity (EC) values of 0.13 mS/cm, 0.62 mS/cm, 0.74 mS/cm, 0.95 mS/cm and 1.16 mS/cm, respectively. The addition of salt had different effects on the rice grain yield, yield component and aromatic compound, but did not affect the softness texture. Adding salt into the soil depressed the grain yield on average by 36.3% for all applications. The adverse effect of salt on the yield was correlated with the effect on the 1,000 grain weight (correlation coefficient (r) = -0.94, p < 0.05). The lowest level of salt application at 1.16 g NaCl /kg soil significantly raised the level of 2 AP, but not at the higher rates of salt application. Soil salinity did not affect the quality of grain softness texture at any application rate. These results suggested that while salinity may invariably depress the rice yield, at a certain level it may improve the grain quality by increasing the concentration of the main aromatic compound without impacting the softness texture. This needs to be confirmed using field trials in naturally occurring saline soils.
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Claims 5
Claim · model-written summary
Salt addition depressed grain yield by an average 36.3%.
- Taxon
- Thai Hom Mali ricet0
- Material
- Khao Dawk Mali 105t0
- Treatment
- Adding salt into the soile0
- Outcome
- grain yielde0
- Direction
- depressede0
- Value
- 36.3%e0
Not reportedComparator
Verbatim
e0“Adding salt into the soil depressed the grain yield on average by 36.3% for all applications”
t0“Thai Hom Mali rice cv. Khao Dawk Mali 105”
Claim · model-written summary
The salt effect on yield correlated with the effect on 1,000 grain weight (r = -0.94).
- Taxon
- Thai Hom Mali ricet0
- Treatment
- salte0
- Outcome
- yielde0
- Value
- r) = -0.94e0
- Comparator
- 1,000 grain weighte0
Not reportedDirection
Verbatim
e0“The adverse effect of salt on the yield was correlated with the effect on the 1,000 grain weight (correlation coefficient (r) = -0.94, p < 0.05)”
t0“Thai Hom Mali rice”
Claim · model-written summary
The lowest salt rate significantly increased 2 AP concentration.
- Taxon
- Thai Hom Mali ricet0
- Treatment
- salt application at 1.16 g NaCl /kg soile0
- Outcome
- level of 2 APe0
- Direction
- raisede0
Not reportedComparator
Verbatim
e0“The lowest level of salt application at 1.16 g NaCl /kg soil significantly raised the level of 2 AP”
t0“Thai Hom Mali rice”
Claim · model-written summary
Higher salt rates did not raise 2 AP concentration.
Not reportedComparatorDirection
Verbatim
e0“but not at the higher rates of salt application”
e1“significantly raised the level of 2 AP”
t0“Thai Hom Mali rice”
Claim · model-written summary
Soil salinity did not affect grain softness texture at any application rate.
- Taxon
- Thai Hom Mali ricet0
- Treatment
- Soil salinitye0
- Outcome
- quality of grain softness texturee0
- Direction
- did not affecte0
Not reportedComparator
Verbatim
e0“Soil salinity did not affect the quality of grain softness texture at any application rate”
t0“Thai Hom Mali rice”