Studies on the breaking strength of straw of oat varieties at Aberdeen, Idaho
1932
Davis, L.L. | Stanton, T.R.
There are several advantages of a satisfactory mechanical straw-breaking test for determining straw strength of oats. Its chief advantage is that it can be used where lodging of the grain does not occur. Other advantages are that it can be used to supplement observations on field lodging and to test hybrids where the quantity of material is limited. Data obtained from the straw-breaking tests at Aberdeen on the registered improved varieties clearly separate the midseason from the early varieties. Under the almost ideal conditions for oats found under irrigation in southern Idaho, the midseason and larger-strawed varieties undoubtedly develop the stronger straw. Significant correlations were found to exist between the breaking strength of straw and several plant characters, such as weight of panicles, weight of grain, weight of straws broken, height of culm and width of second leaf. A correlation coefficient of +.863 +/- .030 was obtained breaking strength of straw of 32 registered improved varieties for the years 1929 and 1930. There was close agreement between the breaking strength of straw of standard varieties grown in the regular yield test nursery of 1929 and 1930. A correlation coefficient value of +.702 +/- .057 was obtained. The range in the breaking-strength readings for these varieties was not so great as that for the registered improved varieties. This is due primarily to the fact that the standard varieties are all of the midseason type with straw of similar height and diameter. In general, the reputed stiff-strawed varieties as determined by field observations when subjected to a mechanical straw strength test, showed the highest resistance to breaking.
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