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Residual Effects Of Fall And Spring Applied Nitrogen Fertilizers On Crop Yields In The Southeastern United States

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Residual Effects Of Fall And Spring Applied Nitrogen Fertilizers On Crop Yields In The Southeastern United States

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Author : Robert W. Pearson
language : en
Publisher:
Release Date : 1961

Residual Effects Of Fall And Spring Applied Nitrogen Fertilizers On Crop Yields In The Southeastern United States written by Robert W. Pearson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Nitrogen fertilizers categories.

Nitrogen fertilizer broadcast in November or December on widely different soils at seven locations in Alabama, Georgia, and Mississippi during 1955-59 was only 49 percent as effective as nitrogen fertilizer applied the following spring when measured by corn yields. In terms of nitrogen recovered, the relative effectiveness was 62 percent. There were no consistent differences among the five nitrogen sources applied in the fall as measured by corn yields, but nitrogen recovery tended to be lower from urea than from the other sources. Considerable residual effects of spring-applied nitrogen were found over a period of 16 months based on both yield and nitrogen uptake by the crops. Average uptakes of 25 and 34 pounds per acre of additional nitrogen were made by the second and third crops, respectively, from the 200-pound original application. This residual nitrogen produced average yield increases of 1,600 pounds of dry forage and 19 bushels of corn per acre. These results emphasize the economic importance of residual nitrogen and the need for soil test procedures for its estimation.

Abstracts Of Recent Published Material On Soil And Water Conservation

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Author :
language : en
Publisher:
Release Date :

Abstracts Of Recent Published Material On Soil And Water Conservation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Soil conservation categories.

Abstracts Of Recent Published Material On Soil And Water Conservation

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Author : United States. Soil Conservation Service
language : en
Publisher:
Release Date : 1962

Abstracts Of Recent Published Material On Soil And Water Conservation written by United States. Soil Conservation Service and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with Nature categories.

Abstracts for Dec. 1954- issued in the Agricultural Research Service's series ARS-41.

Demand And Prices For Meat

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Author : Amos D. Jones
language : en
Publisher:
Release Date : 1961

Demand And Prices For Meat written by Amos D. Jones and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Agriculture categories.

Technical Bulletin

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Author :
language : en
Publisher:
Release Date : 1961

Technical Bulletin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Agriculture categories.

Effects Of Intensive Fertilizer Use On The Human Environment

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Author :
language : en
Publisher: Food & Agriculture Org.
Release Date : 1978

Effects Of Intensive Fertilizer Use On The Human Environment written by and has been published by Food & Agriculture Org. this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Business & Economics categories.

A number of countries in Europe and North America have been using fertilizers heavily for a number of years and particulary since 1945. This high level of fertilizer applications is essential to supply the necessary food for increasing populations and to meet higher demands for animal and plant products. Effects of fertilizer use on the environment should show first in countries where fertilizers have been used intensively for some time and where consumption is steadily rising. It is the experience gained in such countries which is being discussed below with a view to assessing the impact of fertilizers on the human environment, including the development of methods for recognizing and minimizing any undersirable consequences which may be produced. It should be realized that high densities of human population combined with intensive crop and livestock production have led to the production of organic wastes at a rate too high for natural processes to convert it in ecologically safe compounds. Therefore both direct and indirect effects of intensive fertilizer use have been reviewed.