Yearbook of AgricultureU.S. Government Printing Office, 1955 - Agriculture |
Contents
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Common terms and phrases
acres agricultural alfalfa amount of water applied aquifer areas average basin canals capacity channels clay cost crops damage depth ditches drain drainage effect engineer erosion evaporation evapotranspiration farm farmers feet field field capacity flood flow forest furrow gallons grass ground water ground-water growth humid hydraulic head inches increase infiltration installed irri irrigation water land less loss marshes material measures ment method million moisture stress muck soils needed occur operation peat percent period permeable pipe plants practices precipitation pressure problems production protection pump rain rainfall range reduced reservoirs River root zone runoff saline salt sand sediment seepage slopes snow Soil Conservation Soil Conservation Service soil moisture sprinkler square miles storage stream surface surface runoff temperature tensiometer tile tion trees ture United usually Valley vegetation water supply water table waterfowl watershed yield
Popular passages
Page 4 - HE sendeth the springs into the valleys, Which run among the hills. They give drink to every beast of the field : The wild asses quench their thirst. By them shall the fowls of the heaven have their habitation, Which sing among the branches.
Page 4 - Thou shalt also consider in thine heart, that, as a man chasteneth his son, so the LORD thy God chasteneth thee. Therefore thou shalt keep the commandments of the LORD thy God, to walk in his ways, and to fear him. For the LORD thy God bringeth thee into a good land, a land of brooks of water, of fountains and depths that spring out of valleys and hills...
Page 4 - He causeth the grass to grow for the cattle: and herb for the service of man; That he may bring forth food out of the earth...
Page 197 - No public forest reservation shall be established, except to improve and protect the forest within the reservation, or for the purpose of securing favorable conditions of water flows, and to furnish a continuous supply of timber for the use and necessities of citizens of the United States...
Page 616 - You come to us and tell us that the great cities are in favor of the gold standard: we reply that the great cities rest upon our broad and fertile prairies. Burn down your cities and leave our farms, and your cities will spring up again as if by magic ; but destroy our farms and the grass will grow in the streets of every city in the country.
Page 193 - There are mountains in Attica which can now keep nothing but bees, but which were clothed, not so very long ago, with fine trees producing timber suitable for roofing the largest buildings ; the roofs hewn from this timber are still in existence.
Page 345 - Disregarding the unmeasured factors, consumptive use varies with the temperature, daytime hours, and available moisture (precipitation, irrigation water or natural ground water). By multiplying the mean monthly temperature (t) by the monthly percent of daytime hours of the year (p>, there is obtained a monthly consumptive-use factor (f).
Page 161 - Water: (1) surface condition and amount of protection against the impact of rain; (2) internal characteristics of the soil mass, including pore size, depth or thickness of the permeable portion, degree of swelling of clay and colloids, content of organic matter, and degree of aggregation; (3) the moisture content and degree of saturation; (4) the duration of rainfall or application of water; and (5) the season of the year and temperature of soil and water.
Page 668 - Water should be subject to regulation because it is essential to human existence, because it is a changing resource that may bring good or evil to many people according to its use and management and because some of it is subject to established public and private rights of use. The more valuable water becomes, the more conflicts of interest arise over its use and management. The conflicts may lead to insecurity of investments and impeded or unbalanced economic growth if basic law is not provided to...
Page 348 - The only method so far developed that measures the actual evapotranspiration from a field or any other natural surface without disturbing the vegetation cover in any way is the so-called "vapor transfer