. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 1324 PHYSIOLOGY PHYSIOLOGY green wood, and often as much as 95 per cent in the pumpkin. The Food Supply of Salts from the Soil.— Besides se- curing from the soil its water supply, the plant must secure in the same way all of its ash constituents, and usually all of its nitrogen, as soluble salts. The salts furn
. Cyclopedia of American horticulture, comprising suggestions for cultivation of horticultural plants, descriptions of the species of fruits, vegetables, flowers, and ornamental plants sold in the United States and Canada, together with geographical and biographical sketches. Gardening. 1324 PHYSIOLOGY PHYSIOLOGY green wood, and often as much as 95 per cent in the pumpkin. The Food Supply of Salts from the Soil.— Besides se- curing from the soil its water supply, the plant must secure in the same way all of its ash constituents, and usually all of its nitrogen, as soluble salts. The salts furnishing food are such well-known food ingredients, or constituents of fertilizers, as potash compounds, 1781. Sweet pea grown m soil containine the tuber- cle-formine organism. 1782. A similar plant in a soil freed from the tu- bercle bacteria. phosphateSi nitrates, etc. The various mineral elements generally necessary for the plant are potassium, phos- phorus, sulfur, calcium, magnesium, and iron in small quantities. These, as well as other inessential elements, are the constituents that remain in the form of ash when tlie plant is burned in air. That each one of these ele- ments, as well as nitrogen, is necessary for the full development of the higher plant has been repeatedly demonstrated. For this demonstration seedlings are supported and grown in jars containing culture solu- tions. One or more of the above elements may be left out in certain cases to be compared with one in which all are present, and it will then be found that growth and development will soon be arrested where even one necessary element is entirely absent. Nitrogen Sometimes Furnished by the ^4iV. —Plants ordinarily get their nitrogen from the soil as nitrate of soda, saltpeter, or other soluble salts. This is the rule, and although the air contains about 75 per cent by weight of the free gas nitrogen, it is in this form entirely inert to most plants. Leguminous plants (Leguminosse) form a great except
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