Elements of farm practice, prepared Elements of farm practice, prepared especially for teaching elementary agriculture; elementsoffarmpr01wils Year: 1915 32 ELEMENTS OF FARM PRACTICE for many centuries. So it is necessary to learn only about the ones that are most likely to be required. Names.—The four elements that are most likely to become limited in the soil are nitrogen, phosphorus, potas- sium and calcium. The names of these elements are not hard to pronounce or learn. Every boy and girl should know these names, what part each element plays in the growth of plants, and a practical means
Elements of farm practice, prepared Elements of farm practice, prepared especially for teaching elementary agriculture; elementsoffarmpr01wils Year: 1915 32 ELEMENTS OF FARM PRACTICE for many centuries. So it is necessary to learn only about the ones that are most likely to be required. Names.—The four elements that are most likely to become limited in the soil are nitrogen, phosphorus, potas- sium and calcium. The names of these elements are not hard to pronounce or learn. Every boy and girl should know these names, what part each element plays in the growth of plants, and a practical means of maintaining Figure 13.—A crop of alfalfa, one of the best farm fertilizers. a supply of them in the soil. Boys and girls who have studied physiology and have learned how to pronounce and to know the meaning of such words as occipital, parietal, cerebellum, etc., or who have learned to pronounce and know the meaning of such words as subtrahend and min- uend in arithmetic will not have difficulty in learning to use the words, nitrogen, phosphorus, potassium and calcium. Nitrogen is needed by all plants. Nearly 80%%%%%%%%%%%%%%%% of the air is nitrogen, and this is the chief source of nitrogen for the soil. The problem of the farmer is to get the nitrogen out of the air and into the soil. It is present in the soil
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