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A Crop Rotation Field Layout with an Illustration of the Statistics Involved in Combining Several Years' Data
Author(s) -
Cook R. L.,
Millar C. E.,
Robertson L. S.
Publication year - 1946
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1946.03615995001000c00035x
Subject(s) - section (typography) , library science , work (physics) , advice (programming) , statistics , crop , descriptive statistics , computer science , operations research , agricultural science , mathematics , sociology , engineering , geography , environmental science , forestry , mechanical engineering , programming language , operating system
Michigan, attention became centered on the lack of experimental results pertaining to crop rotation and sequence. It was impossible to answer from experimental evidence such questions as, "What crop should immediately precede sugar beets in the rotation ?"; "Are legumes essential in the sugar beet rotation, and if so, what legume is most desirable ?"; "What proportion of the rotation time should be allotted to the production of soil building legumes ?" To obtain satisfactory answers to these and other questions, the Ferden rotation and crop sequence experiment was started in the spring of 1940. It is the object of this article to present the field plans and problems of manipulation and to show how the data from such a layout may be statistically analyzed. The results obtained from the main crop, sugar beets, during one complete rotation are presented in full. The 1940 results are not considered because it required that one year to get the rotations started; even in 1941 there were still some irregularities. Not until 1942 did sugar beets actually follow two years of alfalfa and, in the case of rotation 7, it was 1942 before the crop could have been affected by sweetclover seeded in 1940.