Summary
Growth of sudan grass was studied for response to Mn concentrations in the culture solutions ranging from deficient to toxic and in the presence and absence of Si. In the absence of Si, the optimum Mn level was 0.25 to 0.50 mg/l. One mg/l Mn was toxic and reduced plant growth. The addition of 5 mg/l Si to the nutrient solutions decreased accumulation of Mn, Cu, Fe, and Zn in the plant tissues, and in fact induced Mn deficiency in those plants receiving 0.5 mg/l Mn or less. One function of Si under these experimental conditions was the amelioration of Mn toxicity as manifested by increased dry matter accumulation by the Mn-toxic plants when Si was added. It is doubtful that Si satisfies the criteria for essentiality in sudan grass, however, and if so, the required Si concentration must be less than 0.025 mg/l.
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Journal Series No. 1422 of the Hawaii Agricultural Experiment Station.
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Bowen, J.E. Manganese-silicon interaction and its effect on growth of Sudan grass. Plant Soil 37, 577–588 (1972). https://doi.org/10.1007/BF01348516
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DOI: https://doi.org/10.1007/BF01348516