Role Of Soil Bacteria: The role of soil bacteria is crucial for they not only fix nitrogen from the air in a form that plants can use but also promote the pro¬cesses of decay. Animals whose homes are in the soil have an important if largely mechan¬ical function in shifting and aerating the soil -it has been estimated that earthworms alone can turn over between one and ten tonnes of soil per hectare per year. As they eat and excrete the soil they also change its texture and composition.
Gram stained bacteria with a solution of gentian violet in aniline water, treated it with an aqueous solution of iodine and potassium iodide, and washed it in alcohol. He found that some bac¬teria—the Gram-negative bacteria—lost the color, tvhile other bacteria—the Gram-positive bacteria-retained the stain. This method not only aided lie microscopic study of bacteria but also pro¬vided a useful means of classifying bacteria.See Also Soil Types:Grapevines grow well on a wide range f soil types. However, they do not grow well i heavy clay, shallow, poorly drained, alkali, or igh-boron soils. V. vinifera varieties are deep-acted and should have a loose soil structure, /hich favors extensive root development. The sputed influence of soil type on the quality of tie wines in certain areas of Europe may be more factor of soil drainage and higher soil tem-eratures than an effect of soil per se,Climate.
Soil conservation is the effort to avoid this destruction of the soil and to maintain it at the most productive level possible. This requires a combination of all the techniques of soil science in preparing the land, irrigating it, fertilizing it and planting the right crops to stabilize the soil and prevent erosion.
On The Other Hand See Soil Conservation:Of the 50 species of birds found in Rhode Island, 33 are considered permanent residents. Among the commoner birds are the blue jay, ruffed grouse, catbird, flicker, osprey, sandpipers, terns, gulls, and 5 species of ducks. Frogs, turtles, 20 species of snakes, rabbits, foxes, woodchucks, skunks, and squirrels also form part of the fauna of the state.
Conservation.—The entire state is divided into three soil conservation districts. The chief state conservation agencies are the Water Re¬sources Board and the Conservation Division of the Department of Natural Resources.
Roosevelt's second term was characterized by vigorous legislative leadership. The Hepburn Act of 1906 enlarged the powers of the Interstate Commerce Commission so it could regulate against discriminatory rate practices, and the same year Congress passed the Meat Inspection and Pure Food Acts. Conservation measures were also launched on a broad front, and Roosevelt was particularly successful in awakening the citi¬zenry to the need for being conservation-minded.
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