Excerpt from Proceedings of the Tenth Southern Conference on Forest Tree Improvement: Houston, Texas, June 17-19, 1969 Classification of plant breeding systems has been traditionally based on methods of reproduction. The three major categories are: Self Pollinated, cross-pollinated, and asexually-propagated. Sprague (1967) has provided an alternate classification of breeding systems by use of the terms population improvement and hybridization. As defined by Sprague, population improvement includes all operations within a system designed to yield a sexually-propagated improved type whether this be a random mating population or pure line. Hybridization, on the other hand. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.