Some Relations Of Organic Matter In Soils PDF Download

Excerpt from Some Relations of Organic, Matter in Soils: A Thesis Presented to the Faculty of the Graduate School of Cornell University for the Degree of Doctor of Philosophy The effect of lime on the organic matter in soils has been for some time one of the leading problems for investigation. The results that have been recorded, however, are not consistent. Some investigators have reported that there is a greater accumulation of organic matter in limed than in unlimed soil, while others have stated the contrary. This difference of opinion is not surprising when the methods of experimentation, the soil variations, and the climatic conditions are considered. There has been, however, too great a tendency to draw conclusions from unreliable data. In many cases, attempts have been made to study the effect of lime on the organic matter in soils without a knowledge of the composition of the soils before treatment. In view of the many discrepancies in the reported results. the present experiment was designed to ascertain the effect of lime on the organic matter in soils under various treatments and cropping systems. Historical Wheeler and others(1899) reported that lime decreased the percentage of humus in soils under continuous culture of cereals. They found also that there was an increase of roots and residual organic matter in limed grass plats as compared to those not limed. Hess (1901) studied the effect of lime on some of the Pennsylvania soils. He stated that liming resulted in a diminution of the nitrogen. Kossovich and Tretjakov (1902)stated that the addition of calcium carbonate to soil retarded the decomposition of organic matter. Hartwell and Kellogg(1906) pointed out that the amount of humus in limed plats was less than that in unlimed plats. They stated also that the effect produced by lime upon the organic matter of a given soil was dependable to a considerable extent on the degree of acidity or of alkalinity of the 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.