Manganese content of the rice plant under water culture conditions

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Abstract
The rice plant has been known to have a high tolerance to manganese. Tissues of rice plants have been found to contain as much as 4,000 ppm Mn with no apparent harmful effects (1). On the other hand, others have reported manganese toxicity in tissues containing 2,000 ppm Mn (2, 3). Under water culture conditions, 10 ppm Mn was reported to be the upper critical level in the culture solution for maintaining normai rice growth; at this level, the straw contained 1,000 ppm Mn (4). Toxicity symptoms started to develop at 30 ppm Mn in culture solution (5).