. Plant propagation : greenhouse and nursery practice . Plant propagation. 90 PLANT I'ROI'AGATION cerned heat is the only important one. For though all these agents produce the same effect (arousing the ac- tivity of enzymes or ferments, chemically or physicalh', to change and make available the stored plant food, especially that near the budsj, heat is the most active. most normal, and most easily and economically applied. Therefore, the plant grower, while in- terested in the abnor- mal agents, applies heat under proper con- trol to secure a healthy growth where he knows it is needed first o
. Plant propagation : greenhouse and nursery practice . Plant propagation. 90 PLANT I'ROI'AGATION cerned heat is the only important one. For though all these agents produce the same effect (arousing the ac- tivity of enzymes or ferments, chemically or physicalh', to change and make available the stored plant food, especially that near the budsj, heat is the most active. most normal, and most easily and economically applied. Therefore, the plant grower, while in- terested in the abnor- mal agents, applies heat under proper con- trol to secure a healthy growth where he knows it is needed first of all. Cuttings after being set in the propagating bed always begin to grow at the part most favorably placed as to temperature. That is, if a stem cutting be placed so its upper end is in an air temperature appreciably higher than that of the soil, growth will begin in the upper buds. With no cuttings is this so apparent as with cuttings o) immature wood, grown in a greenhouse. When bottom heat is lacking and the air warmed, even only bv sun heat, the buds expand into new stems and leaves; but few or usually no roots are produced. Such conditions. FIG. 7!>—ONE "LIGHT" FORCING FRAME The sash lifts for ventilation. 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 Kains, M. G. (Maurice Grenville), 1868-1946. New York : Orange Judd Company
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectplantpropagation
