fair.” _CHAPTER III._ Yields, and Comparisons With Other Crops COMPARED WITH CLOVER Many things are understood best through contrasts with others better known. In every part of the country certain crops are considered standard, and all others are judged by comparison with these. For example, red clover in most parts of the United States is ranked as the richest and best yielding forage, and the fertilizer and renovator _par excellence_. The Massachusetts experiment station after a series of tests reports that 100 pounds of clover contain 47.49 pounds of digestible food and 6.95 pounds of proteids, while 100 pounds of alfalfa contain 54.43 pounds of digestible food and 11.22 pounds of proteids. The New Jersey station reports that the average yield per annum of green clover to the acre is 14,000 pounds, and of green alfalfa 36,500 pounds; the protein in the clover is 616 pounds and in the alfalfa, 2214 pounds; one ton of alfalfa has 265 pounds of protein, and clover only 246 pounds. But alfalfa will produce three, four, or more cuttings each year, while clover will produce but one or at most two. Further, clover will ordinarily survive but two years, while alfalfa will last from ten to one hundred, thus saving many plowings and seedings. It is also estimated that the stubble and root-growth of alfalfa are worth at least four times as much for humus as are those of clover, while the mechanical and other beneficent effects of the long alfalfa roots far excel those of clover. The alfalfa field is green for pasturage a month earlier in the spring than clover and may be mowed a month earlier. It starts a vigorous growth at once after cutting, covering the ground with its luxuriant foliage before the second growth of clover has made any substantial progress. The Wisconsin experiment station says that “one acre of alfalfa yields as much protein as three acres of clover, as much as nine acres of timothy and twelve times as much as an acre of brome grass.” COMPARISONS WITH SEVERAL GRASSES