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Author: Milton Whitney Publisher: Forgotten Books ISBN: 9780265840429 Category : Languages : en Pages : 62
Book Description
Excerpt from Investigations in Soil Fertility In a broad sense a fertile soil has been taken to mean one which usually produces a large crop. The yield would thus be a measure of fertility. The yield, however, 18 dependent not only upon the condition and properties of the soil, but upon the climatic conditions as well. In a more restricted sense some agricultural investigators have endeavored to approximate the fertility of soils from the results of chemical analyses, recognizing that the yield of crops is not a measure of fertility, as the yield is dependent upon the kind of, crops adapted to a particular Soil, upon the texture of thesoil itself, present mechan ical conditions drainage conditions, suitable climatic conditions, and efficient methods of cultivation. It is in a similarly restricted sense that the term will be used in this bulletin; that is to say, fertility is the inherent power of a soil to produce and support a satisfactory crop under favorable climatic conditions and suitable cultivation. To what this inherent power may be due, whether to definite amounts of plant food or to other causes, need not be more specifically stated at this point. Using fertility in this restricted sense, the conditions of climate, drainage, and cultivation, being more or less incidental and variable, would affect the yield but not necessarily the fertility of a soil. 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.
Author: Milton Whitney Publisher: Forgotten Books ISBN: 9780265840429 Category : Languages : en Pages : 62
Book Description
Excerpt from Investigations in Soil Fertility In a broad sense a fertile soil has been taken to mean one which usually produces a large crop. The yield would thus be a measure of fertility. The yield, however, 18 dependent not only upon the condition and properties of the soil, but upon the climatic conditions as well. In a more restricted sense some agricultural investigators have endeavored to approximate the fertility of soils from the results of chemical analyses, recognizing that the yield of crops is not a measure of fertility, as the yield is dependent upon the kind of, crops adapted to a particular Soil, upon the texture of thesoil itself, present mechan ical conditions drainage conditions, suitable climatic conditions, and efficient methods of cultivation. It is in a similarly restricted sense that the term will be used in this bulletin; that is to say, fertility is the inherent power of a soil to produce and support a satisfactory crop under favorable climatic conditions and suitable cultivation. To what this inherent power may be due, whether to definite amounts of plant food or to other causes, need not be more specifically stated at this point. Using fertility in this restricted sense, the conditions of climate, drainage, and cultivation, being more or less incidental and variable, would affect the yield but not necessarily the fertility of a soil. 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.
Author: Michael Peech Publisher: Forgotten Books ISBN: 9780260455345 Category : Science Languages : en Pages : 34
Book Description
Excerpt from Methods of Soil Analysis for Soil-Fertility Investigations In some soils it is rather difficult to discriminate between the weathered rock and the soil; here the operator must use his own judg ment. Pick out and set aside any gravel, iron concretions, or rocks that may be present and combine later with the material that does not pass ythrough the 2 mm. Sieve. Repeat this process of crushing and sieving until only the primary particles and organic residues re main On the sieve. This coarse material may be discarded. Mix well the soil material passing the2 2-mm. Sieve and store in an airtight container. This constitutes the stock sample on which all the determinations here described are made. 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.
Author: Edward Burnett Voorhees Publisher: Forgotten Books ISBN: 9780428973025 Category : Science Languages : en Pages : 118
Book Description
Excerpt from A Review of Investigations in Soil Bacteriology Soil fertility, broadly interpreted, denotes the crop-producing power of any soil under given climatic conditions, and is itself the resultant of many forces often opposed to one another. It'is no easy task to establish the correlation of these several forces, and to assign to each its true position as a factor in the creation of plant substance. We do know that suitable moisture and temperature conditions are indispensable not only for the absorption and assimi lation of the plant food in the soil, but also for the formation of this plant food. Granting, however, that the moisture and tem perature conditions are suitable, our inquiry is at once directed toward the ways and means whereby the soil is made to yield nour ishment to the plants growing upon it. Obviously, an intimate knowledge of the ways and means of plant-food production is, aside from its theoretical interest, of great practical concern, a fact which is exemplified by the benefits derived by our agricultural industries from the researches of the agricultural chemist. It was through the investigations of the latter that we have learned to know the con crete meaning of the term plant food, and have learned also to apply this knowledge to the incalculable advantage of society. But as the rapidly accumulating experimental data broadened. His horizon, the agricultural chemist was the first to recognize that chemical methods alone were wholly inadequate for a clear comprehension of the complicated processes occurring in arable soils. The keen insight of Hilgarda revealed the vast possibilities that lay in the joint application of chemical and physical methods in the study of soil fertility problems, and the splendid contributions of soil physics to scientific agriculture bear testimony to the soundness of his judgment. 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.
Author: Gustave Herman Eidmann Publisher: Forgotten Books ISBN: 9780366375202 Category : Business & Economics Languages : en Pages : 102
Book Description
Excerpt from Soil Fertility Studies, With Special Reference to Certain Soils of St. Clair County, Illinois: Thesis The object of these investigations was to determine the value of adding lime, nitrogen, phosphorus and potassium.to each of these types of soils, for the growing of wheat. The object was later ex tended and a crop of millet grown after the Wheat had been harvested. The first series of pot cultures, which was called the A series was prepared to determine whether or not these elements of fertility when added slightly in excess are of any value to the soils under consideration for the production of the above mentioned crops, While the second or B series was intended to indicate in what amounts it is profitable to add the elements which prove to be of value in series A. 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.
Author: Cyril G. Hopkins Publisher: ISBN: 9781331921226 Category : Science Languages : en Pages : 80
Book Description
Excerpt from Soil Fertility Laboratory Manual Note. - The student practices described in this laboratory manual are the result of five years experience by the authors in conducting classes in a course of study in soil fertility. With some modifications the usual chemical methods are employed, specific chemical directions being commonly based upon those adopted by the Association of Official Agricultural Chemists. Otherwise these practices were originated in this University. The increasing number of students in this institution, and the fact that some other institutions also desire to use our manual, induced us to put it in printed form. Suggestions from other teachers of soil fertility regarding possible improvements in the manual will be gladly received. 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.
Author: Cyril G. Hopkins Publisher: Forgotten Books ISBN: 9780483270305 Category : Science Languages : en Pages : 64
Book Description
Excerpt from Laboratory Manual for Soil Fertility The increasing number of students in this institution, and the fact that some other institutions also desire to use our manual, induced us to put it in printed form. 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.
Author: Andrew Robeson Whitson Publisher: Forgotten Books ISBN: 9781528272421 Category : Business & Economics Languages : en Pages : 324
Book Description
Excerpt from Soils and Soil Fertility The business of the farmer is to produce the various food materials and those from which clothing is made. These materials are of both animal and vegetable origin; but since all agricultural animals must depend on vegeta tion for their food, the growth Of farm crops forms the basis of all agriculture. 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.
Author: Alfred Vivian Publisher: Forgotten Books ISBN: 9780267986798 Category : Business & Economics Languages : en Pages : 278
Book Description
Excerpt from First Principles of Soil Fertility This little book is intended primarily for home read ing. It is written, however, largely from lecture notes used by the author in a course in soil fertility given to winter course students, and, therefore, will be found to be a suitable text for short courses. It is an at tempt to present in non-technical language a subject of great scientific and practical interest to the farmer. The subject of Soil Fertility is so large, that each phase of it could of necessity be only briefly considered in a small book, and the writer did not pretend to make the discussion of any topic exhaustive. For this reason some things have been omitted which might have been discussed with profit in a larger work. Only the more important facts concerning the maintenance of fertility have been presented, but it is believed that the statements so far as they go are in accord with the best scientific thought and practice of the day. 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.
Author: James Edward Halligan Publisher: ISBN: 9781330831489 Category : Business & Economics Languages : en Pages : 412
Book Description
Excerpt from Soil Fertility and Fertilizers This book has been written to be within reach of the student, farmer, manufacturer and other persons interested in the subject of "Fertilizers." Technical terms have been omitted as much as possible. It has been the aim of the writer to bring this subject up to date, not only from the manufacturers viewpoint but from the actual field results as well. A full discussion of the data in the tables has necessarily been avoided so as not to make the book too voluminous. 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.
Author: Milton Whitney
Author: Milton Whitney
Author: Michael Peech
Author: Edward Burnett Voorhees
Author: Gustave Herman Eidmann
Author: Cyril G. Hopkins
Author: Cyril G. Hopkins
Author: Milton Whitney
Author: Andrew Robeson Whitson
Author: Alfred Vivian
Author: James Edward Halligan