Soil organic matter and its role in crop production
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Soil organic matter and its role in crop production
Soil organic matter and its role in crop production
F.E.ALLISONSOIL ORGANIC MATTẸRẠNDĨTS roLe .in'crop PRODUCTIONDEVELOPMENTS IN SOIL SCIENCE 3Developments in Soil Science 3SOIL ORGANIC MATTERANDITS ROL Soil organic matter and its role in crop production LE IN CROP PRODUCTIONThis Page Intentionally Left BlankDevelopments in Soil Science 3SOIL ORGANIC MATTERANDITS ROLE IN CROP PRODUCTIONBYF.E. ALLISON tU.S. Department of Agriculture, Washington, D.C., U.S.A.ELSEVIER SCIENTIFIC PUBLISHING COMPANYAmsterdam London New York 1973ELSEVIER SCIENTIFIC PUBLIS Soil organic matter and its role in crop production HING COMPANY335 JAN VAN GALENSTRAAT, P.O. BOX 1270, AMSTERDAM, THE NETHERLANDSAMERICAN ELSEVIER PUBLISHING COMPANY, INC. 52 VANDERBILT AVENUE, NEW YORSoil organic matter and its role in crop production
K, NEW YORK 10017LIBRARY OF CONGRESS CARD NUMBER: 72-83193ISBN 0-444-41017-1WITH 39 ILLUSTRATIONS AND 52 TABLESCOPYRIGHT ©1973 BY ELSEVIER SCIENTIFIC F.E.ALLISONSOIL ORGANIC MATTẸRẠNDĨTS roLe .in'crop PRODUCTIONDEVELOPMENTS IN SOIL SCIENCE 3Developments in Soil Science 3SOIL ORGANIC MATTERANDITS ROL Soil organic matter and its role in crop production ORM OR BY ANY MEANS, ELECTRONIC, MECHANICAL, PHOTOCOPYING, RECORDING, OR OTHERWISE, WITHOUT THE PRIOR WRITTEN PERMISSION OF THE PUBLISHER, ELSEVIER SCIENTIFIC PUBLISHING COMPANY. JAN VAN GALENSTRAAT 335, AMSTERDAMPRINTED IN THE NETHERLANDSPREFACESoil organic matter has, since the dawn of history, be Soil organic matter and its role in crop production en the key to soil fertility and productivity. In the earlier years, as nomadic populations moved about in search of places where they could settle doSoil organic matter and its role in crop production
wn and till the soil, they selected the soils that were most productive, and this meant highest in organic matter, even though they may not have recogF.E.ALLISONSOIL ORGANIC MATTẸRẠNDĨTS roLe .in'crop PRODUCTIONDEVELOPMENTS IN SOIL SCIENCE 3Developments in Soil Science 3SOIL ORGANIC MATTERANDITS ROL Soil organic matter and its role in crop production ts have determined with considerable exactitude the reasons for the benefits commonly realized from soil organic matter. These are discussed in some detail on the pages that follow. It will be noted that organic matter plays major roles in the chemical, microbiological and physical aspects of soil f Soil organic matter and its role in crop production ertility. Some of these effects are so hidden and intangible as to be almost ignored and greatly underevaluated by those who are not specialists in thSoil organic matter and its role in crop production
e separate scientific branches. The role of soil organic matter as a source of nutrients, primarily nitrogen, is the one phase of the subject that hasF.E.ALLISONSOIL ORGANIC MATTẸRẠNDĨTS roLe .in'crop PRODUCTIONDEVELOPMENTS IN SOIL SCIENCE 3Developments in Soil Science 3SOIL ORGANIC MATTERANDITS ROL Soil organic matter and its role in crop production ource there has been a tendency in the present fertilizer era to place less emphasis on soil organic matter as a factor in plant nutrition. The present availability of abundant commercial nitrogen does not, however, make soil organic matter any the less valuable; nitrogen acts as a supplement and is Soil organic matter and its role in crop production , in fact, the most important constituent of humus. The addition of nitrogen fertilizer makes it much easier to maintain humus at the desired level, tSoil organic matter and its role in crop production
hereby making it possible to obtain more benefits from it.In most previous extended discussions of soil organic matter it has been customary to put thF.E.ALLISONSOIL ORGANIC MATTẸRẠNDĨTS roLe .in'crop PRODUCTIONDEVELOPMENTS IN SOIL SCIENCE 3Developments in Soil Science 3SOIL ORGANIC MATTERANDITS ROL Soil organic matter and its role in crop production asize the dynamic nature of soil organic matter, which it seems to me is of far greater importance than knowledge of the exact nature of the organic constituents in humus. The transformations involved in the decomposition of plant and animal residues are brought about almost entirely by biological a Soil organic matter and its role in crop production gencies, primarily microorganisms and to a lesser extent soil fauna. In fact, humus itself is a colloidal amorphous material containing many living anSoil organic matter and its role in crop production
d dead bacteria. Microorganisms and their products play important roles in soils, including theữ genesis, tilth, nutrient release and retention, erosiF.E.ALLISONSOIL ORGANIC MATTẸRẠNDĨTS roLe .in'crop PRODUCTIONDEVELOPMENTS IN SOIL SCIENCE 3Developments in Soil Science 3SOIL ORGANIC MATTERANDITS ROL Soil organic matter and its role in crop production matter decomposition. When one considers that, in nature, soil organic matter and microorganisms are inseparable, it follows that a discussion of one apart from the other is vữtually impossible, and even undesirable.In the preparation of the various chapters that follow, every effort has been made t Soil organic matter and its role in crop production o present the subject matter in terms that are easily understood by those with limitedF.E.ALLISONSOIL ORGANIC MATTẸRẠNDĨTS roLe .in'crop PRODUCTIONDEVELOPMENTS IN SOIL SCIENCE 3Developments in Soil Science 3SOIL ORGANIC MATTERANDITS ROLF.E.ALLISONSOIL ORGANIC MATTẸRẠNDĨTS roLe .in'crop PRODUCTIONDEVELOPMENTS IN SOIL SCIENCE 3Developments in Soil Science 3SOIL ORGANIC MATTERANDITS ROLGọi ngay
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