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    Application of calcium chloride on yield and quality of Capsicum annuum L.
    (2024-09-01)
    Montri, N.
    ;
    Sengseng, S.
    ;
    Deewatthanawong, R.
    ;
    Bunya-Atichart, K.
    Application of calcium chloride on yield and quality of Capsicum annuum L. 'Super Hot' were investigated. The experiments were conducted in randomized complete block design (RCBD). 0, 20, 40, 60, 80, and 100 mg L<sup>-1</sup>calcium chloride was sprayed preharvest at the orange-red ripening stage. The ripe red fruits were harvested. Yield and quality in terms of fruit color and secondary compound content were measured. The results showed that spraying with various concentrations of calcium chloride did not affect the percentage of dry weight and color of fruit but significantly influenced fresh and dry weight, capsaicin, total phenolics, and total flavonoid contents. Preharvest spraying of calcium chloride at 40 mg L<sup>-1</sup>treatment gave the maximum fresh and dry weight and total phenolics at 1,257.83 g, 361.35 g, and 44.75 mg GAE g<sup>-1</sup>DW, respectively. A high content of total flavonoid at 63.50 and 6.75 mg QE g<sup>-1</sup>DW was observed in 20 to 40 mg L<sup>-1</sup>treatment, while high contents of capsaicin contents at 64.32 mg g-1 DW were achieved in 80 mg L<sup>-1</sup>,.
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    Comparison of calcium gluconate and calcium chloride immersions on physicochemical quality of green Thai peppers during cold storage
    (2024-06-01)
    Supapvanich, S.
    ;
    Kedbanglai, P.
    ;
    Techavuthiporn, C.
    The efficiency of calcium gluconate (Ca-G) immersion on postharvest quality improvement of green Thai peppers compared with CaCl<inf>2</inf> and water immersions during cold storage was investigated. The green Thai peppers were dipped in 1% Ca-G, 1% CaCl<inf>2 </inf>and water (control) for 15 min and then stored at 13°C and 85% RH. Ca-G immersion could better maintain the visual appearance than CaCl<inf>2</inf> and water immersions, consequently. The increased weight loss was delayed by both calcium immersions. Ca-G immersion maintained the fruit greenness and chlorophyll content better than CaCl<inf>2</inf> and water immersions, consequently. Both calcium immersions enhanced antioxidant activity and bioactive compounds (total phenols and ascorbic acid) content more than control treatment. Interestingly, the antioxidant activity and bioactive compounds content of Ca-G treated fruits were higher than those of CaCl<inf>2</inf> treated fruits. In conclusion, 1% Ca-G immersion is a potential alternative calcium treatment that maintains postharvest quality and enhances the nutritional values of the green Thai pepper when compared to CaCl<inf>2</inf> immersion.
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    Effect of Eggshell Wastes from Different Bird Species on Growth and Yield of Peanut
    (2023-01-01)
    Phakamas, Nittaya
    ;
    Gatewit, Phonthip
    ;
    Kongsamret, Maythavee
    ;
    Somchit, Pornpen
    ;
    Aninbon, Chorkaew
    Eggshell wastes from various bird species may be used as an alternative calcium source for peanut production. The purpose of this experiment was to determine the effects of eggshell waste from chicken, duck and quail on the growth and yield of peanut. Five treatments consisting of no gypsum control, three eggshell wastes from chicken, duck and quail, and commercial gypsum were laid out in completely randomized design with four replications during December 2020 to April 2021. Peanut variety KK 6 was planted in cement plots. Gypsum and eggshell wastes were applied at the rate of 312.5 kg/ha at 25 days after planting. Data were collected for growth parameters, pod yield and yield components at harvest. Analysis of variance was performed for all parameters, and means were separated by least significant difference at the 0.01 probability level. Eggshell wastes from chicken, duck and quail did not show significant effects for leaf dry weight, stem dry weight, total dry weight and 100 seed weight, but they significantly increased pod dry weight, seed yield, filled seed, shelling percentage and harvest index. All eggshell wastes produced higher growth and yield of peanut than commercial gypsum. Eggshell waste from duck seemed to be better than the other sources in terms of yield increase in KK 6 peanut.