. 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. 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
. 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. 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 plants are found swellings or tubercles, as in Fig. 1781, caused by the growth of parasitic bacteria. By the aid of these bacteria, the plant is altle to appropriate the free nitrogen of the atmosphere ami to tlirivi- in a soil almost free of nitrates. This htis l,c en . repeatedly with plants in sand or water eultnia s. riiliz- ing the free nitrogen of the air, legntninous (â roi)s. whether
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