. College botany; structure, physiology and economics of plants. Botany. APPLICATIONS OF BOTANY 249 national forest reserves, comprising 174,261,393 acres of land, and employs 3500 men. Most of the states also own forest re- serves and employ professional foresters, and many cities also employ professional foresters to look after their park and street trees. Plant breeding works for the improvement of existing vari- eties and the production of new varieties. Previous to the reoog-. Fia. 114.—Denuded of forest growth by ruthless cutting and fires. A barren rocky wa«te is left, unsuited to other
. College botany; structure, physiology and economics of plants. Botany. APPLICATIONS OF BOTANY 249 national forest reserves, comprising 174,261,393 acres of land, and employs 3500 men. Most of the states also own forest re- serves and employ professional foresters, and many cities also employ professional foresters to look after their park and street trees. Plant breeding works for the improvement of existing vari- eties and the production of new varieties. Previous to the reoog-. Fia. 114.—Denuded of forest growth by ruthless cutting and fires. A barren rocky wa«te is left, unsuited to other agricultural crops. (U. S. D. A.) iiition of the work of Mendel and DeVries, it consisted almost entirely in the aimless selection of desirable individuals and the progress was alow. However, the great majority of our valuable agricultural varieties were. probably obtained in this manner. The ultimate object of plant breeding is to increase the yield, improve the quality of the product, to secure new varieties, or to develop resistance to drouth or disease. It involves selection, hybridization and a thorough knowledge of the Taws of evolu-. 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 Cook, Melville Thurston, 1869-1952. Philadelphia and London, J. B. Lippincott Company
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1920
