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Studies on the Effect of Storage of Freshly Harvested Paddy Under Submerged Condition

Md. Abdul Kaddus Miah
Senior Scientific Officer
Farm Machinery and Postharvest Technology Division, Bangladesh Rice Research Institute, Gazipur-1701

Abstract/ Executive Summary:

The freshly harvested paddy (BR3) was submerged under water at different depths for 30 days and samples were monitored at 5 days interval for assessing the viability of paddy seed and milling quality of milled rice. From the study it may be concluded that BR3 paddy may be kept under water up to 10 days for seed purpose and 15 days for normal consumption.

Keywords: Viability, Temperature, Grain, Pound, Paddy, Milling

Location: BRRI HQ

Start Date: 01-07-1993

End Date: 30-06-1994

Program Area: Farm Mechanization

Commodity: Farm machineries, Storage

Objectives:

i) To study the feasibility of storing freshly harvested paddy under water; ii) To determine the optimum storage period under submerged condition.

Methodology:

An experiment was conducted on storage of freshly harvested paddy under submerged condition in BRRI pond. The freshly harvested paddy (BR3) was sacked in gunny bag and submerged under water for 30 days. The sacks were placed at 0.25m, 0.50m, 0.75m and 1.00m depths from the surface of water. The samples were monitored at 5 days interval. Samples were collected both for unparboiled and parboiled rice. Both the samples were stored separately for milling after proper tempering and aging. For viability test, the collected samples seeds were dried in sun shine or in an oven.

Source of Information: Proceedings of the BRRI Annual Internal Review for 1993-94, BRRI, Gazipur-1701, Bangladesh

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The final moisture content of the paddy ranged from 10.1-12.9%. The grain mass temperature difference between 0.25m and 1.00m depths of water was found to be about 1⁰ C. The germination percentage for 5, 10 and 15 days soaked paddy were found to be 98, 93 and 82% in November 1992 and 94, 81 and 62% in May 1993, respectively. The seed viability for 15 days soaked paddy decreased rapidly. From the study it may be concluded that BR3 paddy may be stored under water for 10 days during rainy season and after proper drying, it may be used as seed purpose. In case parboiled paddy, the milling recovery were 60.4, 61.5 and 70.2 for 5, 10, and 15 days soaked paddy, respectively. The 20 days soaked paddy provided less milling recovery due to quick moisture removal from the grain during drying. But in case of unparboiled rice, the milled rice recovery were 65.9, 58.9, 58.4, 53.7, 43.7 and 41.2% for 5, 10, 15, 20, 25 and 30 days,respectively. Milling recovery as well as quality of the paddy soaked beyond 15 days decreased sharply; which may be attributed to the loosing of atomic structure of rice endosperm. However, the paddy which was soaked upto 15 days did not give only bad smell, but after 20 days of soaking bad smell was felt both for unparboiled and parboiled rice.

Knowledge Management: Report/Proceedings