http://www.sciencedirect.com/science/article/B6TX5-4V4KPJ7-6/2/69e70bca89227102937e48ad003fff30
The development of the root system on five varieties of rice grown under upland conditions, has been studied. It has been found, with the rice varieties used and under the conditions tested, that 66 percent of the roots occured within 5 centimeters and 95 percent within 15 centimeters of the surface of the ground. A few roots were found to reach a depth of 1 meter, and occasionally to a depth of 1.35 meter. The...
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