. Elementary principles of agriculture; a text book for the common schools . Fig. 50. Showing the effect of an exco-^'- of hnic tnl mai^iiesia on plant growth. Excess of Hme in pots on left; excess of magnesia in pots on right. Nearly equal amounts of each in center pots. From Bull, United States Department of Agriculture. grain or fruit, goes all to wood and leaf and does not produce a harvest. In such cases, a potash or a phos- phate fertilizer would be needed to balance the ration of mineral food. Sometimes some element, even an essential element, may be in excess. Plants require magnesium
. Elementary principles of agriculture; a text book for the common schools . Fig. 50. Showing the effect of an exco-^'- of hnic tnl mai^iiesia on plant growth. Excess of Hme in pots on left; excess of magnesia in pots on right. Nearly equal amounts of each in center pots. From Bull, United States Department of Agriculture. grain or fruit, goes all to wood and leaf and does not produce a harvest. In such cases, a potash or a phos- phate fertilizer would be needed to balance the ration of mineral food. Sometimes some element, even an essential element, may be in excess. Plants require magnesium and calcium (^ 43), but an excess of either may be the cause of a poor result. Fig. 50 shows the re- sult of adding lime to balance an excess of magnesia in the soil, and shows the effect of balanced and unbalanced amounts of calcium and magnesium on plant growth. The good effects that sometimes result from the appli-
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Keywords: ., bookauth, bookcentury1900, bookdecade1900, booksubjectagriculture
