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MacGregor
SS Website |
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Description
The rice grain is made up of three main layers which are the hull,
the bran and germ, and the inside endosperm.
The
hull
The hull or husk is the outer hard protective layer which people
cannot eat. The hull is removed when it is
milled through the rice mill machine.
Rice
Bran
Underneath the hull or husk is the bran and germ layer. This layer
gives brown rice its colour. White rice is when the bran and germ
layer are removed.
The bran is the outer layer and the germ is the inside layer.
Endosperm
The Endosperm or Kernal is the inside of the rice grain.
It is hard and white and contains lots of starch.
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Nutritional
Value
Rice is a
delicious, healthy and nutritious food for our bodies.
It is high in carbohydrates, low in fat, gluten free, salt free,
sugar free and contains no additives or preservatives. Rice also
contains lots of protein, vitamins and minerals.
Vitamins found in rice are B vitamins, thiamine, riboflavin and
niacin. Minerals are iron, phosphorus and potassium.
Rice fits into the ‘Eat most’ section of the food pyramid.
There are many types of rice such as Brown rice, White rice, Long
grain rice, Jasmine, Doongara, Medium grain rice, Arborio, Koshihikari
and Wild rice. White rice is less nutritious than brown rice.
Many breakfast cereals are products of rice such as Rice Bubbles.
Did
you know?
Australians eat about 10.7kg of rice per year.
In Australia, about 8 percent of out energy intake comes from rice.
In many Asian countries, about 29 percent of their energy comes
from rice.
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Harvesting
Thailand, Vietnam, India and USA are the top 4 countries in the
world that export rice.
Developing countries
Traditional simple and effective methods of harvesting are still
being used in part of developing such as Thailand, India and Indonesia.
This means the farmers use their hands and feet to harvest.
The process for the farmers are to cut the rice plants with sickles
knives, tie them in bundles and wait for them to get dry in the
fields.
Finally they are delivered to a village for the people to thresh
them by hitting the plants against a slatered screen and getting
the rice grains out. Another popular method is for animals to walk
over them such as Water buffalos or Ox.
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This picture
is from
http://www.brucebriscoe.com/bali/rice.htm |

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Industrialized
countries
Industrialized
countries use combine, which are machines that move through rice
fields to harvest, thresh and clean the grains. Then all the grains
will be dried in sheds with heated air. The machine is called the
harvester.
There
are two types or harvesters. The Stripper front combs the head of
the rice and some of the threshing is done at the front of the machine.
The
Standard front cuts the straw, takes in the straw and heads and
threshes these inside the machine.
After the rice has been threshed and cut it will be stored in a
bin of the harvester.
When
bin is full a ferry or a chaser bin follows them and the harvester
unloads the paddy. After this process the ferry or chaser bin unloads
the paddy into trucks or field bins.
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| This picture is from http://www.agctr.lsu.edu/Subjects/rice/RiceHome.htm\ |
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Pests
and Diseases
Rice can be seriously affected to a large range of pests and diseases
which can destroy up to 55 percent of the world’s rice crops.
The
most common diseases are caused by the fungi sheath blight and rice
blast, and the stalk borer is a common insect pest.
Weeds are also a serious problem because they compete with the rice
plant for nutrients and water.
Rodents
and birds also feed on rice grains before they are harvested.
Lastly Disease-causing fungi and some insects also infest rice during
storing and transport.
Unlike Asia, where insect pests cause serious damages to the rice
growing areas, there are only a few significant pests in Australia.
The most common pests of rice in Australia are bloodworms, snails,
ducks, armyworms and Leafminer.
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Brown Spot Disease |

An adult
Rice Weevil
http://www.agctr.lsu.edu/Subjects/rice/RiceHome.htm\ |
Rice weevils mating |
Shealth Blight Disease |
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Rice
Life
The rice plant is a semiaquatic annual kind of grass which produces
grains for food. Rice plants are Summer crops and they like temperatures
between 20 – 30 degrees Celsius. They are planted in paddy
fields that are flooded with water. Some rice is grown on hillsides
that are cut into terraces.
Before the rice seeds can be sown into Paddy fields, the fields
must be ploughed, fertilized and smoothed.
In some Asian countries traditional hand methods of cultivation
are still practiced. The seedlings are drowned in seedling beds
to grow into tillering for 30 – 50 days. They are then transplanted
by hand into paddy fields which are flooded with rain or water.
Whereas in Industrialized countries, farmers use modern machines
for cultivating and harvesting.
Australia grows rice in Murray Valley, Victoria and Riverina in
New South Wales successfully.
Rice usually grows in about 150 days. During this time the crop
has two main growth phases.
The morphology of rice is divided into the vegetative phase (including
germination, seedling, and tillering stages) and the reproductive
phase (including panicle, initiation and heading stages). |

The
Adult Rice plant |

Planting Rice plants into the Paddy |
Rice Paddy Field |
Vegetative
Phase |
Reproductive
Phase |
| Germination
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Seedling
emergence
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Tillering |
Heading |
Ripening |
0-30 Day |
31-60 Day |
61-90 Day |
91-120 Day |
121-150 Day |
| Rice
seeds are sown into irrigated bays by a combine or an aeroplane. |
Young
seedlings appear above the water surface 10 to 15 days after
sowing. |
A
rice plant can grow 4-5 more stems
from its first tiller.
Each tiller has a panicle (flowering head) which produces
the rice grain. |
Panicle
buds start forming inside all the tillers of the rice plant
and they develop panicle buds into flowers as they travel
up the stem of the plant.
Pollination usually takes place between 11.30am –
1-30 pm.
During that time rice flowers both male and female reproduce
parts and pollinate itself.
Under all the right conditions a single panicle
will be successfully pollinated within 1 week.
It takes 10-14 days for all panicles to finish flowering
and this is called heading.
The fertilized flower then gets close to have protective
hulls which fill with liquid starch and protein.
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There
are four main stages in this process, milky, dough, yellow-ripe
and maturity.
These stages are based on the texture and colour of the developing
grains.
Ripening takes about 40 days.
During this time the liquid in the hull hardens to form a
starchy inner grain. |
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Most pictures in Rice Life were from
http://www.brucebriscoe.com/bali/rice.htm
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