Effects of rice species, germanium application method and soil texture on germanium uptake and growth of rice plants with germanium

摘要

The growth characteristics, Ge absorption and grain quality of rice plants were investigated for different rice cultivars, Ge application method and soil textures in order to select the optimum rice cultivars, germanium (Ge) application method and soil texture for production of functional rice with Ge. The rice yield for soil application was higher in the order of Hopyungbyeo = Junambyeo > Ilmeebyeo ? Dongjinbyeo. On the other hand, the rice yield for foliar spray was higher in the order of Junambyeo> Ilmeebyeo= Hopyungbyeo ? Dongjinbyeo. The rice yield for soil application was higher than that for foliar spray regardless of rice cultivars. For soil application, the Ge absorption in various parts of the rice was higher in the order of rice bran > brown rice > polished rice regardless of rice cultivars. The Ge absorption of brown rice in Hopyungbyeo, Ilmeebyeo, Dongjinbyeo and Junambyeo by soil application was 14.5, 8.0,11.6 and 10.4 mg/kg, respectively. In leaf, stem and root, Ge absorption for foliar spray was higher than that for soil application, whereas, in rice bran, brown rice and polished rice, the Ge absorption for soil application was higher than that for foliar spray. The growth status of rice plant was similar in all soil textures, andrice yield was higher in the order of silt loam > clay loam > loam > sandy loam. In rice bran, the Ge uptake for silt loam, clay loam, loam and sandy loam were 980, 868, 754 and 803 mu g/pot, respectively. The Ge uptake of brown rice and polish rice were greater in the order of silt loam > sandy loam > clay loam > loam. In silt loam, the Ge uptake rates of leaf, stem, root, rice bran and brown rice were 19.7,2.3, 0.03, 3.1 and 0.44%, respectively. Therefore, the optimum rice cultivars, Ge application method and soil texture were Hopyungbyeo, soil application and silt loam, respectively, provide suitable conditions for production of functional rice with Ge.