The book How Productive Are the Soils of Central Illinois was written by author R T Russell Turner Odell Here you can read free online of How Productive Are the Soils of Central Illinois book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is How Productive Are the Soils of Central Illinois a good or bad book?
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48 1941 ... 66 1942 65 1943 ... 65 1944 ... 66 Total yields . . 507 Average yields. . . 63 . 4 Total of yearly cumulative per Average of yearly cumulative sercentages . . 94. 7 This is the percentage of the cultivated land that was treated with limestone before 1928, the year when farm records were first kept. b Oats were not grown in 1932 and 1936. c All cultivated land had been limed before 1944, so this was a second application on part of the tract. centages of the tract had been treated wit...h limestone and with rock phosphate up to and including each year of the study. By 1928, for example, 54 percent of this Clinton silt loam had been treated with limestone. By 1931 all the land had been limed. The "100 percent" for that year of course includes the "54 percent" which had been treated by 1928. The averages at the bottom of these columns are therefore averages of the yearly cumulative percent- ages, not averages of the final total coverage. 384 BULLETIN No. 522 [March, The figures in the last two columns of Table 1 are likewise averages of the yearly cumulative percentages, but for groups of farms.
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