Rice Quality Training Manual 14

Rice Quality Training Manual
10.0 Practical exercises
1. Determine the quality of Milled rice
The following tests will be undertaken in the laboratory to determine the quality of milled rice.
· Moisture content
· Head rice
· Broken
· Color
· Transparency
· Chalkiness
· Cooking test
2. Determine the quality of Paddy or Rough rice
The following tests will be undertaken in the laboratory to determine the quality of paddy rice
· Moisture content
· Purity- Other varieties
· Grain dimensions
· Damaged or broken grains
· Unfilled or immature grains
· Insects
· Weed seeds
· Inert material
3. Testing a Rice mill for performance and quality
We will visit a rice mill and sample the paddy before milling, brown rice after husking and the milled grain after processing. At the same time we will monitor the performance of the rice mill by collecting the outputs from all of the outlets from the mill over a given time period.
That means we will collect and weigh the:
· Head rice
· Course broken
· Fine broken
· Brewers
· Meal and
· Husk
Time
Samples will be collected for 10 minutes from each outlet. An open woven bag will be necessary to collect the husk.
Weighing
Use the miller’s scales
Sub-sampling
Sub samples will be taken from each of the outlets so that they can be analyzed in the laboratory
4. Visit a Rice Field
· Evaluate crop management practices and determine the likely affect on grain quality.
Rice Quality Training Manual
Sheet 1 Rice mill performance
Date ……………………………..
Name ……………………………..
Address ……………………………..
Other data
Replace rollers (tons) ……………………………..
Reface stones (tons) ……………………………..
Fuel consumption (l/hr) ……………………………..
Storage capacity (tons) ……………………………..
Collecting times. The measuring times will depend on the capacity of the mill. A good benchmark is to collect from each outlet for at least 10 minutes.
Expected outputs. A good quality mill will produce 55% head rice, 15% brokens, 10% bran and 20% husk.
Sampling outputs. Collect a grain sample from the paddy, brown rice and from all stages of the process. Check the list.