Excerpt from Agriculture This book was first published in 1919. To each of the six editions that have since been printed many corrections and additions were made in an effort to keep the subject matter up to date. Despite this, the science and practice of agriculture has changed so radically and advanced so rapidly in recent years that it has become necessary, in this seventh edition, to make a far more extensive revision than any of those that preceded it. In this connection the publishers were fortunate in obtaining the services of Mr. G. H. Thorp, M.Agr.Sc., of Otahuhu College, himself a teacher of science and agriculture. In this edition Mr. Thorp has sought to retain the general form of the text, adding features only in order to promote its usefulness as a handbook for pupils and teachers. The needs of the more able pupils have been kept constantly in view. Additions include: A new introductory chapter covering the history of New Zealand agriculture; two new chapters, one on soil conservation and the other on farm trees; major additions to the chapters concerned with energy of plants, soil, fertilisers, pasture management, diseases, pests, and weeds; and a list of accessible literature and films at the end of each chapter. Mr. Thorp wishes to make grateful ackwledgement of the assistance given him by the following scientists and scientific institutions in checking and improving his revision: Mr. H. S. Gibbs, Senior Pedologist of the Soil Bureau, D.S.I.R., Chapters 8 and 9; Dr. E. B. Davies, Principal Scientific Officer, Rukuhia Soil Research Station, Department of Agriculture, Chapters 11 and 12; Dr. J. S. Yeates, Head of Agricultural Botany Department, Massey Agricultural College, Chapter 21; several officers of the Plant Diseases Division, D.S.I.R., Chapters 23 and 24; and to the many authors of books and articles consulted and cited. 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 techlogy 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.