. Plant propagation; greenhouse and nursery practice. FIG. 154 — TRANSPLANT-ING IN LOOSE SOIL l82 PLAXT IROlACAllOX made analyses of i)car trees two years old from the graft onquince and pear stocks to determine the relative quantities ofplant foods stored in the steins of the two sets of plants. It wasfound that during autumn and winter reserve matter was markedlymore abundant in the stem on quince stock. In spring, therefore,the pear on quince was enabled to furnish more food matter forfruit formation and crop production was greatly increased. iVgain,reserve food in stems is nearer the fruit
. Plant propagation; greenhouse and nursery practice. FIG. 154 — TRANSPLANT-ING IN LOOSE SOIL l82 PLAXT IROlACAllOX made analyses of i)car trees two years old from the graft onquince and pear stocks to determine the relative quantities ofplant foods stored in the steins of the two sets of plants. It wasfound that during autumn and winter reserve matter was markedlymore abundant in the stem on quince stock. In spring, therefore,the pear on quince was enabled to furnish more food matter forfruit formation and crop production was greatly increased. iVgain,reserve food in stems is nearer the fruit than in roots and is thuspossibly more readily utilized. If these experiments are accuratewe may find the best stocks are those whose roots store the leastquantity of reserve-foods and so force the accumulation of re-serve matter in stems. Unquestionabh^ some effects of stock are due to altered nutri-tion—possibly to insufficient nutrition of stock or cion. Much evi-dence points to disturbance of nutrition as the chief cause of the. FIG. 155—HERBACEOUS GRAFTING AND BUDDING I, herbaceous buds; 2, herbaceous grafts. Summer methods of propagatinggrapes on green canes. None of the herbaceous methods so far tested in Californiaha\e been veiy successful. effects of grafting. It may be that food elaborated by the foliageof the cion is different from that the stock would have had withits own foliage. It has been suggested that difference in specificgravity of stock and cion sap may be a disturbing factor. Butthese explanations are not sufiicient to cover all phenomena arisingfrom grafting. Truth is we have for the most part only certainisolated facts to explain which we must rely upon inferenceswhich have the greatest amount of probability in their favor fromthe knowledge of the case. It remains for someone to tell Why nurserymen bud or graft trees.—Important though theeffects of stock are on cions, any and all are but incidental to thetrue explanation for a two-part
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjectplantpropagation
