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Determining Yields on Experimental Plats by the Square Yard Method 1
Author(s) -
Michels C. A.,
Schwenderman John
Publication year - 1934
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1934.00021962002600120003x
Subject(s) - yard , square (algebra) , agronomy , chemistry , mathematics , physics , biology , geometry , quantum mechanics
The difference between plat and square yard yields range from 0.2 of a bushel to 3.1 bushels on all classes of grains for the seasons of 1929 and 1930, with the exception of the oat varieties for the seasons of 1929, which gave a discrepancy of 6.1 bushels. The difference of 3.1 bushels between plat and square yard yields is perhaps within the probable error. However, a difference of 6.1 bushels between plat and square yard yields is no doubt highly significant. Fifty-four plats of Jenkin wheat show a difference of 2.6 bushels and 0.9 bushel, respectively, for the seasons of 1929 and 1930. These differences are not significant as indicated by probable errors of the difference. However, when Student's method is used on the same data the odds indicate that yields from square yards can not be substituted for plat yields. High positive correlations for both seasons indicate that such a substitution can be made satisfactorily. A difference of 5.4 bushels between plat and square yard yields for Federation for 1929 is too great to permit the substitution of one method for the other. A difference of 1.6 bushels between plat and square yard yields for Federation for 1930 is so small that it is safe to assume that the square yard method for computing yields on cereals can be substituted for the plat method. The biometrical findings on data for Red Bobs for the seasons of 1929 and 1930 parallel those for Federation for the same seasons, with the exception of the odds by Student's method, which indicates that square yard methods for the season 1930 can be substituted for the plat method. All the results from the statistical constants used on Markton oats indicate that the square yard method can be substituted for the yield obtained on entire plat. A difference of 8.6 bushels between square yard and plat yields for Trebi barley is too great to warrant a substitution. The odds for all the constants except correlation are against the substitution. The data on the number of square yards to take within a plat indicate that for all practical purposes from 12 to 18 square yards should be taken in a plat before yields computed on square yards may be considered comparable to yields computed on an entire plat.