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Author: G. Stanford
Publisher: Forgotten Books
ISBN: 9780656593385
Category : Business & Economics
Languages : en
Pages : 32
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Book Description
Excerpt from Fertilizer Use and Water Quality This publication evaluates the role of nitrogen and phosphorus fertilizers in water pollution and summarizes the research on the complex relations between nutrient inputs and outputs. Available data do not often permit making valid estimates of nutrient transfer from fertilizers to ground and surface waters. A reliable basis for evaluating the effects of fertilizers on water quality requires quantitative measurements of water inputs and behavior in agricultural watershed studies that encompass appropriate ranges in climatic and management conditions. When virgin soils in the United States were first cultivated, many were rich in organic matter and plant nutrients. These soils provided far more nitrogen than the crops could use, and losses by leaching to water bodies or by denitrification to the atmosphere were large. As a result of cultivation, these natural supplies gradually diminished. By 1969, the use of almost 7 million tons of fertilizer nitrogen a year, as well as improved land use and management practices, was still not enough to compensate for the large yearly drop in the capacity of the soil to supply nitrogen. 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: G. Stanford
Publisher: Forgotten Books
ISBN: 9780656593385
Category : Business & Economics
Languages : en
Pages : 32
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Book Description
Excerpt from Fertilizer Use and Water Quality This publication evaluates the role of nitrogen and phosphorus fertilizers in water pollution and summarizes the research on the complex relations between nutrient inputs and outputs. Available data do not often permit making valid estimates of nutrient transfer from fertilizers to ground and surface waters. A reliable basis for evaluating the effects of fertilizers on water quality requires quantitative measurements of water inputs and behavior in agricultural watershed studies that encompass appropriate ranges in climatic and management conditions. When virgin soils in the United States were first cultivated, many were rich in organic matter and plant nutrients. These soils provided far more nitrogen than the crops could use, and losses by leaching to water bodies or by denitrification to the atmosphere were large. As a result of cultivation, these natural supplies gradually diminished. By 1969, the use of almost 7 million tons of fertilizer nitrogen a year, as well as improved land use and management practices, was still not enough to compensate for the large yearly drop in the capacity of the soil to supply nitrogen. 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: Robert L. Kellogg
Publisher: Forgotten Books
ISBN: 9780366798124
Category : Business & Economics
Languages : en
Pages : 122
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Book Description
Excerpt from Agricultural Chemical Use and Ground Water Quality: Where Are the Potential Problem Areas? Table 10 Average scores by State for the Ground Water Vulnerability Index for Nitrogen fertilizer (gw vin) Figures Figure 1 Percent area with soils that have a High Soil Leaching Class 9 (for pesticides) 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: G. Stanford
Publisher:
ISBN:
Category : Fertilizers
Languages : en
Pages : 0
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Book Description
Author: L. Fred Welch
Publisher: Forgotten Books
ISBN: 9780331771282
Category : Business & Economics
Languages : en
Pages : 66
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Book Description
Excerpt from Nitrogen Use and Behavior in Crop Production This bulletin is one of six publications growing out of a four - and-a-half year study of nitrogen as an environmental quality factor. Although the study, including publication costs, was supported principally by a grant from the Rockefeller Foundation, the effort was initiated through a grant from the Illinois Agricultural Association. This phase of the study was supported through staff assistance provided by a number of state agencies, but in particular by the Illinois Agricultural Experiment Station and the Illinois State Water Survey. Four other bulletins in the series have been published: Nitrates, Nitrites, and Health, Bulletin 750; Environmental Decision Making: The Role of Community Leaders, Bulletin 756; Economic Effects of Controls on Nitrogen Fertilizer, Bulletin 757; and Wells and Ponds Water Quality and Supply, Bulletin 758. A book on nitrogen in relation to food, environment, and energy is being prepared as part of the series. 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: Howard J. Haas
Publisher: Forgotten Books
ISBN: 9781390433814
Category : Business & Economics
Languages : en
Pages : 30
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Book Description
Excerpt from Effect of Crops and Fertilizer on Soil Nitrogen, Carbon, and Water Content, and on Succeeding Wheat Yields and Quality Evans, and Miles (4) studied the effect of 30 or more years of cropping on N and C content of soil at three locations in the Great Plains. Three years of alfalfa or grass in a 6-year rota tion reduced the loss of soil N and C compared to small grain cropping, but neither alfalfa nor grass maintained these elements at their orig inal level. 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: Harry Snyder
Publisher: Forgotten Books
ISBN: 9781528080361
Category : Business & Economics
Languages : en
Pages : 294
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Book Description
Excerpt from Soils and Fertilizers It is evident from the preceding example that any thing like an adequate idea of the growth and compo sitiou of plant bodies could not be gained until the composition of air and water was established. The discovery of oxygen by Priestley in 1774, of the composition of water by Cavendish in 1781, and of the r61e which carbon dioxide plays in plant and animal life by De Saussure and others in 1800, formed the nucleus of our present knowledge regarding the sources of matter stored up in plants. It was between 1760 and 1800 that alchemy lost its grip because of advances in knowledge and the way was opened for the development of modern chemistry. 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: United States. Environmental Protection Agency. Office of Water Regulations and Standards
Publisher:
ISBN:
Category : Water
Languages : en
Pages : 456
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Book Description
Section 304(a) (1) of the Clean Water Act 33 U.S.C. 1314(a) (1) requires the Environmental Protection Agency (EPA) to publish and periodically update ambient water quality criteria. These criteria are to accurately reflect the latest scientific knowledge (a) on the kind and extent of all identifiable effects on health and welfare including, but not limited to, plankton, fish shellfish, wildlife, plant life, shorelines, beaches, aesthetics, and recreation which may be expected from the presence of pollutants in any body of water including ground water; (b) on the concentration and dispersal of pollutants, or their byproducts, through biological, physical, and chemical processes; and (c) on the effects of pollutants on biological community diversity, productivity, and stability, including information on the factors affecting rates of eutrophication and organic and inorganic sedimentation for varying types of receiving waters. In a continuing effort to provide those who use EPA's water quality and human health criteria with up-to-date criteria values and associated information, the document was assembled. The document includes summaries of all the contaminants for which EPA has developed criteria recommendations.
Author: Robert Harcourt
Publisher: Forgotten Books
ISBN: 9780364797402
Category :
Languages : en
Pages : 24
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Book Description
Excerpt from Fertilizers and Their Use On our comparatively new lands, and in general farm practice where a judicious rotation of crops is followed. And where grain is fed on the farm and the manure properly cared for, it may not be necessary to use commercial fertilizers; but where the nature of the crops grown prevents rotation, and where very little farmyard manure is produced, they may be required. More and more each year it is found that the increased cost of production and the consequent need of producing maximum crops, and the growing demands of the larger towns and cities for garden and fruit products of high quality, are causing market gardeners and fruit growers to consider seriously the advisability of using some form of fertilizer. This has created a demand for information concerning these substances which it has not been easy to fill; for experience has shown that the farmer must posses a wide knowledge of plants, soils and the fertilizers themselves before he can properly use them. To intelligently and economically use fertilizers, it is essential that the farmer understand the needs of the cr0ps, their power to gather the essential plant food constituents from the soil, and the purpose of their growth, i.e., whether the object is to produce an immature plant for early market, or whether maturity is required. He must also know something about the available supply of plant food' tn the soil and the nature of the fertilizer being used. These fertilizers are expensive, and unless they are intelligently applied in conjunction with very thorough cultivation they will not give their best results. They cannot take the place of cultivation; for they are food materials, and can only aid the growth of the plant as they are absorbed by the roots, and these cannot develop fully in a poorly cultivated 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: Arnon Lewis Mehring
Publisher: Forgotten Books
ISBN: 9780331397444
Category :
Languages : en
Pages : 58
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Book Description
Excerpt from Fertilizer Consumption in 1941 and Trends in Usage Plant nutrients are divided by the Association of Official Agriculture Chemists in its Official definitions into primary and secondary plant food elements. The primary plant nutrients are nitrogen, phosphoric acid, and potash. Only these three are included in this work. Plant food and plant nutrient are here used as synonymous terms, as is customary in fertilizer laws and common usage, though this does not strictly follow the terminology of plant physiology. Commercial fertilizers usually contain somewhat more of each plant nutrient than is guaranteed or indicated by the grade. This excess, known as the overrun, was used in determining the actual nitrogen (n), phosphoric acid (p205), and potash contents of fertilizers consumed in 1941 by the method described in detail by Mehring and Deming Briefly, this method involves averaging the guaranties and analyses given in the State fertilizer control bulletin for all mixtures of a given class sold during the season involved and adding the excess of the average analysis over the average guaranty to the weighted average grade as found from the tons of each grade sold. Parts of the necessary data for 1941 were unavailable for Arkansas, Idaho, Illinois, Montana, Nebraska, Nevada, North Dakota, South Dakota, Tennessee, Utah, Washington, and Wyoming: In such cases, estimates were made from 1939 tonnage data and analyses published by the nearest States with similar conditions. 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: National Fertilizer Development Center (U.S.)
Publisher:
ISBN:
Category : Fertilizers
Languages : en
Pages : 0
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Book Description
