(;.630.7 
 
 no. 229 
 cop. 5 
 
UNIVERSITY OF 
 
 ILLINOIS LlgRARY 
 
 AT URBANA-CHAMPA!6'^ 
 
 AGRICULf Uf?l 
 
TJKoc 
 
 ACO( ^.^^^^"r;^^^ 
 
 ^GHV 
 
 cuu-^^^^ 
 
 UNIVERSITY OF ILLINOIS 
 
 Agricultural Experiment Station 
 
 URBANA, SEPTEMBER, 1918 
 
 CIRCULAR No. 229 
 
 Illinois Wheat Yields With Nature's 
 Fertilizers 
 
 By CYRIL G. HOPKINS, CniEr in Agronomy and Chemistry; J. E. WHITCHURCH, 
 
 F. W. GARRETT, H. P. T. FAHRNKOPF, H. C. GILKERSON, and H. J. SNIDER 
 
 Associates in Soil, Fertility; and E. E. GLICK, Assistant 
 
 Note. — The results reported with no soil treatment in Tables 
 1 and 2 are the averages of three trials on each field, except at West 
 Salem, where there is only one trial on untreated land, and at Gales- 
 burg, where there are four trials with some limestone applied. 
 
 Table^I.— TEN WHEAT FIELDS IN "EGYPT" 
 
 (Bushels per acre, 1918) 
 
 Soil 
 treat- 
 ment 
 
 En- 
 field 
 field 
 
 Ewing 
 field 
 
 New- 1 
 ton 
 field 
 
 Ob- 
 long 
 field 
 
 Pana 
 field 
 
 Ra- 
 leigh 
 field 
 
 Sparta 
 field 
 
 To- 
 ledo 
 field 
 
 Union- 
 ville 
 field 
 
 West 
 
 Salem 
 
 field 
 
 Aver- 
 age 
 
 Began 
 FuU\ 
 
 1913 
 1915 
 
 1910 
 1914 
 
 1912 
 1913 
 
 1912 
 1914 
 
 1913 
 1915 
 
 1910 
 1914 
 
 1916 
 1920 
 
 1913 
 1915 
 
 1911 
 1915 
 
 1913 
 1914 
 
 
 None. 
 
 8.4 
 
 3.1 
 
 .1 
 
 8.8 
 
 7.7 
 
 10.9 
 
 4.7 
 
 6.4 
 
 12.2 
 
 .0 
 4.5- 
 8.1 
 11.0 
 
 6.2 
 
 M.... 
 ML... 
 MLP., 
 
 6.3 
 12.3 
 17.0 
 
 5.4 
 16.5 
 21.1 
 
 .3 
 
 9.8 
 
 17.7 
 
 15.8 
 22.7 
 33.4 
 
 3.2 
 
 6.2 
 
 11.2 
 
 14.6 
 25.9 
 29.3 
 
 7.7 
 12.3 
 15.3 
 
 7.8 
 14.2 
 16.2 
 
 14.2 
 23.3 
 24.9 
 
 8.0 
 15.1 
 19.7 
 
 R 
 
 RL... 
 RLP.. 
 
 9.6 
 19.3 
 22.9 
 
 1.5 
 12.9 
 18.5 
 
 .3 
 10.8 
 16.7 
 
 13.2 
 30.5 
 36.1 
 
 10.4 
 14.5 
 19.7 
 
 12.8 
 22.3 
 27.3 
 
 5.2 
 13.2 
 13.0 
 
 7.4 
 14.6 
 10.2 
 
 13.3 
 22.5 
 26.2 
 
 7.3^ 
 
 7.2 
 
 12.5 
 
 8.1 
 16.8 
 20.3 
 
 RLPK 
 
 23.9 
 
 21.4 
 
 17.7 
 
 38.8 
 
 15.8 
 
 24.9 
 
 16.7 
 
 16.7 
 
 26.1 
 
 18.2 
 
 22.0 
 
 ^After soil treatment is begun about one crop rotation is usually required 
 to get the full treatment underway. 
 
 ^Some limestone also was applied to these two plots at West Salem. 
 
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Digitized by tine Internet Arciiive 
 
 in 2011 with funding from 
 
 University of Illinois Urbana-Champaign 
 
 http://www.archive.org/details/illinoiswheatyie229hopk 
 
^ 
 
 
UNIVERSITY OF ILLINOIS-URBANA 
 
 Q.630.7IL6C C0D5 
 
 CIRCULAR URBANA, ILL. 
 2291918 
 
 0112 019535498