The magnesium content of grasses and legumes and the ratios between this element and the total calcium, phosphorus, and nitrogen in these plants
1935
Daniel, H.A.
The total magnesium content and the ratios between the total calcium, phosphorus, and nitrogen were studied in 162 mature plants and the tops and roots of 40 samples of legumes collected at different stages of growth. The average magnesium content of the 19 species of mature grass was 0.156% and that of the 45 mature legumes 0.379%. The grass varied in percentage of this element from 0.059 to 0.316 and the legumes from 0.329 to 1.024. Legumes were found to contain 2.43 times as much magnesium as the grasses. The data obtained showed that the magnesium content of legumes decreased as the plants matured. The calcium-magnesium ratios varied in the mature grasses and legumes from 1.10 to 5.46, the phosphorus-magnesium ratios from 0.09 to 2.42, and the nitrogen-magnesium ratios from 2.09 to 22.06. The data recorded showed that the average of these ratios was slightly higher in the legume tops collected at different stages of growth than in the roots. Very little relation was found to exist between the chemical composition of the tops of the plants and that of the roots.
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