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Because they follow the paddy fields - i.e. the water paddocks. They aren't ploughed like dry fields.
A paddy field is a flooded parcel of arable land used for growing rice and other semiaquatic crops. Rice can also be grown in dry-fields, but from the twentieth century paddy field agriculture became the dominant form of growing rice.
They have to irrigate their fields
from water researves irrigation
The process called irrigation is the most common form of watering dry fields, water is pumped from reservoirs or wells. However some farmers will have land removed to lower the field so that the water table will supply the crops.
The word paddy is generally used for rice or unmilled rice. In this case the answer is a bit lame: paddy is used as a food crop. Paddy could also refer to paddy fields; flooded and sometimes terraced rice fields often seen in South East Asia. Paddy's are used to secure water for the always thirsty rice plants. The practice of leaving the fields submerged during the growing season keeps away many weeds (most plants can't root under water) as well as some pest animal like rodents and certain types of insects. Although wet rice cultivation it's the mostly used method it's also possible to grow rice on dry land. Because of the high water needs of most rice varieties this is only possible using irrigation or in regions with high and reliable rainfall.
what factors do you need to consider when cutting hair
Irrigation
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Farmers get their water by the irrigation. (called the Central Valley Project)
Around autumn when the fields are dry.
The cast of The Dry Fields - 2012 includes: Paul Clerkin as Brown Kai Francis Lewis as Boy Mike Tibbetts as Howard