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The final measure of the performance of any crop variety is its yielding ability in relation to that of other varieties of the same crop. Yield itself is the result of the interplay of many factors, including the hereditary ability of a variety to produce, the conditions of soil and climate under which it is grown, and the various yield reducing factors of the environment. As they differ in inherent qualities, which both affect yielding ability and yield limitations, varieties will differ. The successful estimation of the potentialities of any variety demands that it be grown under a wide variety of environmental conditions and at many locations. The yield tests of small grain varieties conducted by members of the South Dakota Experiment Station Staff and U.S.D.A, cooperators are designed to measure the performance of varieties of wheat, barley, rye, oats and flax under the variable condition of climate and environment encountered in the state. The information obtained in those tests is used as a basis for making varietal recommendations for the guidance of farm operators. It also servos to provide useful knowledge about varieties in which there may be an interest, and, in the evaluation of new selections originating in South Dakota as well as elsewhere. This evaluation must always be in terms of present varieties.

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Agricultural Experiment Station, South Dakota State College