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Exogenous Application of Antioxidants on Leaf Chlorophyll, Yield Dynamics and Berry Quality of Sweet Pepper (capsicum Annuum L.)

Md. Saidur Rahman
Department of Agricultural Botany, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh.

Mahmoda Akter
Department of Soil Science, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh, Bangladesh.

Md. Shah Newaz Chowdhury
Department of Soil Science, Faculty of Agriculture, Bangladesh AgriculturalUniversity, Mymensingh, Bangladesh.

Md. Mofizur Rahman
Department of Horticulture, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh.

Mostarak Hossain Munshi
Department of Soil Science, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh

Abstract/ Executive Summary:

An experiment was carried out to investigate the influences of seven levels of antioxidants on BARI Mistimorich-1 and BARI Mistimorich-2 varieties of sweet pepper at the Central Research Farm of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh. Antioxidants were applied to sweet pepper varieties which had a significant effect on physiology, yield and quality of sweet pepper. Among those treatments, ascorbic acid (AA) at 200 ppm with salicylic acid (SA) at 200 ppm was more potential to enhance chlorophyll a (30%), chlorophyll b (39.39%), total chlorophyll (33.73%), number of flower plant-1 (17.63%), number of fruits plants-1 (56.73%), fruit yield plant-1 (43.61%), total soluble sugar (28.67%) and vitamin C (22.75%) compare to control. The variety of BARI Mistimorich-2 produces 4.55% higher fruit yield than BARI Mistimorich-1. Among those antioxidants, AA at 200 ppm with SA at 200 ppm demonstrate the best potentiality to solved flower and fruit dropping problems and ultimately lead to higher production of sweet pepper.

Keywords: Capsicum, Antioxidants, Ascorbic acid, Salicylic acid, Chlorophyll, Vitamin C.

Location: Central Research Farm of Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Start Date: 00-11-2019

End Date: 00-05-2020

Program Area: Variety and Species

Commodity: Sweet Pepper

Objectives:

To assess the optimum concentration of antioxidants i.e. ascorbic and salicylic acids and their impact on the growth, morphology, yield and quality of sweet pepper.

Methodology:

A pot experiment was conducted at the central research Field of Sher-e-Bangla Agricultural University, Dhaka-1207 from Nov, 2019 to May, 2020. The soil of the experimental pot belongs to the overall soil category, shallow red-brown terrace soil with silty clay. Soil hydrogen ion concentration was 5.6 and has organic carbon 0.45%. Sweet pepper was used as the check crop during this experiment. The experiment comprised two factors viz. variety: BARI Mistimorich-1 and BARI Mistimorich-2 and antioxidant concentrations: control, AA@100 ppm, AA@200 ppm, SA@100 ppm, SA@200 ppm, AA@100 ppm + SA@100 ppm and AA@200 ppm + SA@200 ppm. The randomized complete block design (RCBD) was followed within the experiment includes 3 replications. There were 14 pots for each replication resulting in 42 pots containing 24 kg of soil in each pot. Seeds (0.23 g m^-2) were sown in the seedbed for healthy seedlings. The fertilizers were applied 10-ton cowdung ha^-1, 250 kg carbamide ha^-1, 350 kg TSP ha^-1, 250 kg MP ha^-1, 110 kg gypsum ha-1and 5 kg zinc sulfate ha^-1 as a supply of NPKSZn. The half quantity of cowdung was applied before the final preparation of pots and the rest ½ quantity of cowdung, TSP, MoP, gypsum, zinc sulfate and 1/3^rd of urea were applied inside 2 installments after 25 and 50 days after transplanting. Intercultural operations were done to make sure the general growth of the crop. Plant protection measures were followed as and once necessary. In this experiment, the ascorbic acid and salicylic acid solution were applied in 3 installments. The 1^st, 2^nd and 3^rd sprays were done at 25, 45 and 65 DAT with a hand sprayer. Plants were chosen haphazardly from every pot. Data on the subsequent parameters were recorded throughout the experiment such as:- chlorophyll a (mg l^-1), chlorophyll b (mg l^-1), Total chlorophyll (mg l^-1), number of flower plant^-1, number of fruits plants^-1, Fruit yield plant^-1 (g), total soluble sugar (%) and vitamin c (mg/100g). The data obtained from different parameters were statistically analyzed following the computer-based package Statistix 10 and mean separation were done by LSD at a 5% level of significance (Gomez & Gomez, 1984).

Source of Information: International Journal of Sustainable Agricultural Research; 2020 Vol. 7, No. 4, pp. 316-324

Article Link (Online Journal): DOI: 10.18488/journal.70.2020.74.316.324

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In conclusion, long-run exposure to cold prolonged cell cycle duration and resulted in reduced plant growth. The foliar application of antioxidants (ascorbic acid and salicylic acid) treatments were typically effective in alleviating the injury caused by cold through stimulating the vegetative growth, photosynthetic pigments, and bioconstituents activities that could be reflected on the yield and quality of sweet pepper fruit. Foliar spraying with ascorbic acid at 200 ppm combined with salicylic acid at 200 ppm being the most effective. It is postulated that the foliar spraying with ascorbic acid and salicylic acid at low temperatures may positively regulate the pepper growth and therefore improved productivity.

Knowledge Management: Journal