. Dry-farming; a system of agriculture for countries under a low rainfall. Dry farming. FUNCTIONS OF ROOT-HAIRS 169 impossible for the plant to continue its life functions. The indispensable plant-foods gathered from the soil by the root-hairs, in addition to water, are: potas- sium, calcium, magnesium, iron, nitrogen, and phos- phorus, — all in their proper combinations. How the plant uses these substances is yet poorly Fig. 39. Penetration of a root-hair through soil. but we are fairly certain that each one has some particular function in the life of the plant. For instance, nit
. Dry-farming; a system of agriculture for countries under a low rainfall. Dry farming. FUNCTIONS OF ROOT-HAIRS 169 impossible for the plant to continue its life functions. The indispensable plant-foods gathered from the soil by the root-hairs, in addition to water, are: potas- sium, calcium, magnesium, iron, nitrogen, and phos- phorus, — all in their proper combinations. How the plant uses these substances is yet poorly Fig. 39. Penetration of a root-hair through soil. but we are fairly certain that each one has some particular function in the life of the plant. For instance, nitrogen and phosphorus are probably necessary in the formation of the protein or the flesh-forming portions of the plant, while potash is especially valuable in the formation of starch. There is a constant movement of the indispensable plant nutrients after they have entered the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Widtsoe, John Andreas, 1872-1952. New York, The Macmillan company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdryfarm, bookyear1912
