Effects of salinity concentrations at different stages on growth, yield and grain quality of ST24 rice variety in pot-planted condition
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Abstract
Saltwater intrusion has posed a complex and detrimental impact on rice cultivation in the Mekong Delta. The ST24 is the rice variety with prominent quality, which is being admired by both domestic and international markets. The assessment of salt tolerance at various growth stages aids farmers in minimizing losses during cultivation. This study was carried out to evaluate the effects of salinity concentrations and stages on growth, yield and rice quality of ST24 rice variety in the Summer-Autumn crop in 2023. The rice plants were grown in pots and placed in a greenhouse throughout the experiment. A two-factor experiment was arranged in a complete randomized design (CRD) with three replications. The first factor included three salinity concentrations: 2‰, 4‰, and 6‰, while the second factor comprised three growth stages: the seedling stage, tillering stage, and heading stage. The results indicated that the concentrations and stages of salinization significantly affected the growth, yield and grain quality of ST24 rice variety. The growth parameters tended to decrease as the salinity concentrations increased. The actual yield reached 220.1, 113.5, 46.2 g/plot at salinity concentrations of 2‰, 4‰ and 6‰, respectively. The yield of rice plants was least affected by salinity at the seedling stage (252.8 g/plot) and were most severely affected by salinity at the heading stage (46.8 g/plot). Increasing salinity from 2‰ to 6‰ did not affect gelatinization (at level 2.0), but reduced the size of grains.
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