Effects of scattering rice bran on root system characteristics of Chinese and Japanese rice cultivars
2010
Bian, J., Ehime Univ., Matsuyama (Japan) | Moriya, A. | Morokuma, M. | Toyota, M. | Kusutani, A.
The effects of conventional and organic culture methods on root system characteristics of paddy rice, and its difference between Chinese (Tsumomi 308 and Tsusei 2) and Japanese (Koshihikari and Hinohikari) rice cultivars were studied. Chemical fertilizer and pesticide were applied to the conventional culture plot (K), but only rice bran to the organic culture plot (U). Although the primary root number and total root masses (i.e., total root length, total root dry weight and total root surface area) were larger in K, the total root mass per root number were larger in U in all cultivars. Although specific root weight and root diameter were smaller in U, specific gravity of root was not differed between the two plots. Root depth index was small in U. With some exceptions, bleeding rate per hill was smaller in U and that per root number was higher in U. The difference in bleeding rate per root surface area between the two plots was small. In all cultivars, lower specific root weight in U was accompanied by larger mean root surface area and higher bleeding rate per root number. Therefore, thinner and longer branch roots in U resulted in extension of the surface area per root, and increase in water absorbing ability. The high bleeding rate per root number in U, however, did not increase the bleeding rate per hill, because of the restriction of root number per hill.
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