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Excerpt from The Chemistry of the Soil as Related to Crop Production The objects to be attained in the management of a soil are the deter mination of the crop or crops adapted to it, the regulation Of the yield, and the control of the quality of the product. The investigations made by the Bureau of Soils during the last ten years have Shown that the economic distribution of crops is dependent mainly upon the physical characteristics of soils and upon climate. It has been believed that the chemical characteristics of soils have a more or less direct and controlling influence on the yield Of a crop On any particular soil; that is to say, where wheat yielded 10 bushels per acre in one field, and in an adjoining field (the soil of which had the same texture, so far as could be determined, although it might be in a better physical condition) 25 or 30 bushels were Obtained, this difference in yield would be found to be due to or associated with a difference in the amount of available plant food in the soil of the two fields. It was believed, further, that the better physical condition resulting through loosening up and aerating the soil and exposing it to the weathering influence of the atmosphere by better and more thorough methods Of cultivation would in itself prepare a larger amount of readily available food material for the use of crops. These two subjects, distribution and yield, are both of vital impor tance to the farmer; but While the yield of crops has been a study for the experimenter and farmer alike throughout historic times, too little attention has been paid by him to the adaptation of particular soils to crops. The yield is to-day the paramount question with the farmer, and all his energy and resources in the last analysis tend to this end. 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.
Excerpt from The Chemistry of Agriculture: For Students and Farmers There is at present need for a text on general agricultural chemistry which will cover the field briefly in a logical manner, giving only the facts, and not consisting of a dis connected series of quotations and tables from the very extended literature of the subject. The need for such a text has been particularly marked in teaching large classes of students at The Pennsylvania State College. As a con sequence the present book has been written. While it is intended primarily for students who have had previous training in Botany, Chemistry, Geology and Physics, it is sufficiently elementary to make it of value to any intelligent person. Concerning some of the statements made in the text it is well known that a difference of opinion exists among authorities, but it is deemed better to present them as facts rather than to give the various arguments or to omit them altogether. 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.
Excerpt from Principles of Agricultural Chemistry In this hook the author aims to present the fundamental principles of agricultural chemistry. The point of view is that of the chemist dealing with agricultural problems; the attempt is made to emphasize chemical methods of investigation, and inculcate scientific habits of thought. Details are omitted so far as they are not necessary to the proper treatment of the subject. Practical applications, which are necessarily local, are left out as much as possible. The book thus treats of agricultural chemistry rather than of chemical agriculture. It attempts to give a comprehensive view of the subject, and to prepare the student for a more detailed study of its various phases. This book is based upon lectures given for a number of years to students in Agriculture at the Agricultural and Mechanical College of Texas. A number of references arc given, some of which do not refer to the articles in which the facts were first published, but to articles of interest or of value to the student, which may contain numerous references to the literature of the subject. It was not deemed desirable nor was it practical, to give references for all the statements made in the text. The author is fully aware of the fact that there is room for differences of opinion as to what should be treated or omitted in a work of this character. He also realizes the difficulty of avoiding errors, and will be grateful to the reader who may bring errors to his attention, or offer suggestions for the improvement of the book. Valuable assistance has been received from Mr. S. E. Asbury. Assistant State Chemist, and especially Dr. C. P. Fountain, Professor of English. 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.
Excerpt from Lectures on Agricultural Chemistry: Or Elements of the Science of Agriculture It has seemed to me that the chief objects which should arrest the'attenti'dri'df Canadian farmers, 'are to preserve the naturally1 ifertile Soils of the country from deteriora Tromi'a'nd to 'restore the fertility of such as' have been already impaired. 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.
Excerpt from The Chemistry of Farm Practice Life, food, and raiment are directly or indirectly de pendent upon agricultural products. In the settlement of our country, land was abundant and people were few, con sequently little thought was given to the needs of the increasing numbers of succeeding generations. As the land first cultivated lost its fertility, the tide of population turned westward where unlimited areas of virgin soil awaited the herds and plowshares of the settlers. But this fresh area has been occupied, and to maintain the fertility of; those fields that are still productive and to restore those that have become exhausted is the problem now facing agriculture. The maintenance of the fertility of a productive soil demands the intelligent application of the principles of agricultural chemistry. The restoration of wornout fields is a difficult and costly undertaking. The successful farmer must reinforce his art by the application of the fundamental information derived from the study of chemistry, geology, botany, bacteriology, and entomology. Chemistry aids agriculture in many ways. By means of it, exact data are collected and the fundamental reasons for practical results are explained. Then, too, chemistry invents new or improves old methods of fertilization. The chemist analyzes soils, manures and vegetable products. The value of soil analysis to the practical farmer, perhaps formerly overrated, in more recent years has been under rated. From a soil analysis the farmer can at least learn if his soil is unusually deficient in any important element. Chemistry also protects the agriculturist from the impositions of the unscrupulous fertilizer manufacturer. 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.
Excerpt from The Chemistry of the Farm As about copies of this little book have been printed during the last ten years in England, the United States, and Belgium, I am encouraged once more to do my best to improve it, and to make such alterations and additions as the progress of Agricultural Chemistry seems to demand. 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.
Excerpt from The Chemistry of Steam-Heated Soils The subject of the effect which heat has upon soils 13 rather promi nently before agricultural investigators at the present time. This subject has received Increasing attention during the last decade, par ticularly from the point of view of sterilization and partial steri lization. There has been much valuable information obtained along the biological lines concerned; also much speculation in this regard without due consideration of the chemical and physical changes in volved, owing largely to the fact that these were not known or but imperfectly understood. The biological factors can not and should not be ignored, but it must be remembered that they are only of sig nificance or interest in the light Of the biochemical changes which they produce in the soil. Moreover, any biochemical changes produced in the soil through other means, be they cultural or by the addition of manures and fertilizers or by the influence of steam heating, in turn affect-the biological activities. The chemistry, therefore, of the soil both before and after heating in, sterilization work becomes of the greatest significance to the biological worker. 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.
Excerpt from Agricultural Chemistry: A Familiar Explanation of the Chemical Principles Involved in the Operations of the Farm As most of the operations of agriculture are an exten sion or adaptation of those of Nature, it follows that all the chemical changefl involved in the phenomena of ger mination, growth, development of seeds, and final decay of plants, as well as the more important changes belong ing to animal life, must be included in the Chemistry of Agriculture. This subject will also include the changes that accompany the alteration in the quality of land, either for the worse, by exhaustion or mismanagement, or for the better, as in the reclamation of waste lands and the restoration of those whose fertility has become impaired by culture. 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.