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Effect of Different Harvest Dates on the Qualitative Components of Radish Varieties

N. Naher
Department of Agricultural Botany, Patuakhali Science and Technology University, Durnki Patuakhali. Bangladesh.

T. Hossain
Department of Crop Botany, BSMRAU, Gazipur, Bangladesh.

Abstract/ Executive Summary:

A field experiment was conducted to determine the effect of four harvests viz, 45, 50, 55 and 60 days after sowing (DAS) on nutritional quality of four radish varieties (Tasakisan Mula-I, Pinky, Druti and Mino-Early-Long- White). Nutrient contents were influenced by different harvest dates. Sugar content was highly influenced by different harvest dates. Tasakisan Mula-l showed higher sugar content at I st harvest (45 DAS), pinky at 2nd (50 DAS) and Druti and Mino-Early-Long-White at 3rd harvest (55 DAS). Free organic acid was not influenced remarkably at different harvest dates. Ascorbic acid contents were higher at 1st harvest and afterwards it decreased in all the varieties. Calcium and zinc contents were highest at 1st harvest. Potassium, sulphur and iron contents were not affected by different harvest dates. Magnesium was same in 45 DAS and 50 DAS in all the varieties and then declined.

Keywords: Harvest dates, Nutritional, Radish varieties.

Location: BSMRAU

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Radish

Objectives:

To determine the optimum harvest date with a view to getting fresh and good nutritional quality root.

Methodology:

The experiment was conducted at the research farm of Bangabundhu Sheikh Muzibur Rahman Agricultural University, Gazipur with a view to finding out the nutritional quality of radish at different harvest dates. Tasakisan Mula-I, Pinky and Druti developed and released by Bangladesh Agricultural Research Institute and Mino-Early-Long- White variety developed by Tasakii Seed Co., Japan were used as V₁ V₂, V₃ and V₄, respectively. The experiment was laid out in randomized complete block design with four replications. Two factors were varieties of radish and harvest time. The unit plot size was 3m x 2m. Seeds were sown in lines by hand at a spacing of 45 cm x 30 cm. Intercultural operations e.g. weeding, irrigation, mulching, etc. were done as and when necessary. Observations were made on the following qualitative parameters e.g. sugar contents (g/lOOg on fresh weight basis), organic acids (g/100g on fresh weight basis), ascorbic acid (mg/lOOg on fresh weight basis) and P, K, Ca, Mg, Fe (%) Zn (ppm) on dry weight basis.

Biochemical analysis: Sugar contents were estimated as per. method described by Somogyi (1952) by using Bertrand A, Bertrand B and Bertrand C solutions. Organic acids were determined as per method described by Shiraishi (1972) titrating with O.IN NaOH solution and was passed through a cation exchange column (CG-IR-120). Ascorbic acids was determined as per procedure by Pleshkov (1976). K, Ca, Mg were measured by atomic absorption spectrophotometer at specific nm for K=766.5nm, Ca=422.8nm and mg=285.2nm. Iron and sulphur were determined from the stock solution by using atomic absorption spectrophotometer at 420 and 248 nm wavelengths, respectively, according to Hunter (1984). Phosphorus was determined by nitric perchloric acid digestion method (Yamakawa, 1993) with the help of double beam spectrophotometer at 440nm wavelength.

Source of Information: . Patuakhali Sci. and Tech. Univ. 2009, 1 (1): 73-78 ISSN 1996-4501

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Nutrient contents were influenced by different harvest dates. Sugar content was highly influenced by different harvest dates. Tasakisan Mula-l showed higher sugar content at Ist harvest (45 DAS), pinky at 2nd (50 DAS) and Druti and Mino-Early-Long-White at 3rd harvest (55 DAS). Free organic acid was not influenced remarkably at different harvest dates. Ascorbic acid contents were higher at 1st harvest and afterwards it decreased in all the varieties. Calcium and zinc contents were highest at 1st harvest. Potassium, sulphur and iron contents were not affected by different harvest dates. Magnesium was same in 45 DAS and 50 DAS in all the varieties and then declined.

Knowledge Management: Journal