Word: soils
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Dates: during 1930-1939
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...bill was on the Senate floor was the U. S. Supreme Court, whether its AAA attitude was right or wrong, whether its powers should be limited, whether it could be fooled. The Plan. The great farm bill of 1936 went into the Senate merely as an amendment to the Soil Conservation Act of 1935, which originally gave the Secretary of Agriculture permission to spend his spare time and any odd change available in preventing soil erosion (TIME, Jan. 27). The "amendment" gave him power for two years to pay farmers not only for preventing erosion but for conserving "fertility...
...Director of the Harvard Forest for one year, beginning May 1, the University has appointed Ward Shepard '10, formerly of the Government Forest Service, and now special adviser on Indian affairs, land policy, and soil erosion...
...important discoveries made by Professor Casagrande is that the pressure exerted by crystallizing ice against the soil in which it is confined is not constant for all freezing temperatures, as it was generally supposed, but increases in proportion to the amount the temperature falls below the freezing point...
Thus at low temperatures, as in northern states during the winter months, tremendous ice pressures, much greater than would have been anticipated under older soil theory, may form beneath the highways. Further, if freezing is sufficiently slow, ice layers may continue to grow indefinitely, the tests showed conclusively...
Professor Casagrande also discovered that in sandy and silty soils, water for the growing ice layers is supplied from free ground water in the soil beneath. The faster the freezing ice is carried out, the smaller is the amount of water supplied from beneath, he found...