. 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 green wDod, jincl often as much as 'J5 per cent in tlie pumpkin. The rood Supply of Salts from the So«.-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 f
. 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 green wDod, jincl often as much as 'J5 per cent in tlie pumpkin. The rood Supply of Salts from the So«.-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 eed from the tu- 'â bacteria. phosphates, nitrates, etc. The various mineral elements generally necessary for the plant are potassium, phos- phorus, sulfur, calcium, magnesium, and iron in small quantities. These, a-* wfll ms othfr incs'-piifinl eli'mriit-;. are the constituent-^ i hni in tin' ..f ;isli wImii the plant is bunitMl m ;iir. 'i'liai i:irii oim' of (iirvr ,-\r nients, as well a^ niir-i.^.n, i < 'i'^~arv (.â !⢠liir lull development of iin' liiuln r plant has ijirii it-p. attally demonstrated. For this demonstration seedlings art- supported and grown in ,iars 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. Tfitrogen Sometimes Jf^uj-nished hy fht" .1/'*â¢. âPlants ordinarily get their nitrogen frnni tlm - ,il a^ of soda, saltpeter, or other solnMc- ^::li I ' i â ' rule, and although the air contains ; ,, i , â , i. ii,'ht of the free gas nitrogen, it is iir tin- i : a. i,, u . , , inert to most plants. Leguminous I'Umt - i Ja -umino-a ; form a great exception to this rule. On tlie roots of such
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