. 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; Horticulture; Horticulture; Horticulture. 1654 SELF-STERILITY ther develop any tendency towards self-sterility and separation of the sexes which the parent plant may (3) The careless practice of taking cions promiscu- ously from the nursery row and from unreliable sources may perpetuate self-sterile individual
. 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; Horticulture; Horticulture; Horticulture. 1654 SELF-STERILITY ther develop any tendency towards self-sterility and separation of the sexes which the parent plant may (3) The careless practice of taking cions promiscu- ously from the nursery row and from unreliable sources may perpetuate self-sterile individuals. (4) Breeding and selecting for other qualities than those associated with seed production may tend to favor these qualities at the expense of the latter. (5) Crossing and intercrossing of hybrids may tend to modify the reproductive organs and to produce self- sterility. (6) Excessive cultivation and over-feeding with ni- trogenous fertilizers may induce too vigorous wood- growth at the expense of seed and fruit production. Self-sterile varieties are unable to fruit and produce seed when planted by themselves. When such varieties are desired for planting they should always be planted with other varieties whose time of flowering is the same. Self-sterility is not always complete. There are all in- termediate grades between plants that are wholly self- sterile and those that are self-fertile. For a condensed lifst of the important varieties of leading fruits wlii'-h ;irc to be self-sterile or self-fertile, see I'.i '' - I'nn. iplrs of Fruit-Growing," 3d edition, pp. JJ I li>- Pollination of Pear Flowers," by Jl. i . i 6, Div. of Veg. Path., U. S. Dipt. A^rii- A full and popular treat- ment of the whole prubk-ra as it affects fruit-growers will be found in Bulletin 181, Cornell Exp. Sta., bv S. W. Fletcher. For the self-sterility of grapes, see Bulletin 169, N. Y. Exp. Sta., by S. A. Beach. For plums, see the writings of F. A. Waugh. See Pollina- tio
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