. Science of plant life, a high school botany treating of the plant and its relation to the environment. Botany. The Environment of Plants 141. Irrigalion Division, U. S. Depi. oj Agriculture Fig. 79. Irrigated and unirrigated sugar cane, showing the value of sufficient water in the growing of tliis crop. SO filled with water as to exclude air from the roots. In order that the roots may penetrate the soil readily, it should not be too resistant; but it should be compact enough to afford the plant a firm anchorage. The soil must supply also certain indispensable chemical elements used by plants
. Science of plant life, a high school botany treating of the plant and its relation to the environment. Botany. The Environment of Plants 141. Irrigalion Division, U. S. Depi. oj Agriculture Fig. 79. Irrigated and unirrigated sugar cane, showing the value of sufficient water in the growing of tliis crop. SO filled with water as to exclude air from the roots. In order that the roots may penetrate the soil readily, it should not be too resistant; but it should be compact enough to afford the plant a firm anchorage. The soil must supply also certain indispensable chemical elements used by plants in the manufacture of food. These elements are potassium, calcium, magnesium, phos- phorus, nitrogen, iron, and sulfur. In soils that contain insufficient amounts of any of these substances the growth of plants is hindered, and certain plants are excluded from such a soil. One of the purposes in using chemical fertilizers is to add to soils or to liberate in them sufficient quantities of all the elements essential to the vigorous growth of crop plants. It should be remembered that in addition to 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 Transeau, Edgar Nelson, 1875-1960. Yonkers-on-Hudson, N. Y. , World Book Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1921
