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The fertilizer experiments summarized in this progress report were conducted on private farms located in 24 counties. The trials were so distributed that the locations would be representative of the major crop and soil areas of the state. The experiments were performed in order to determine the effect of the application of plant food in the form of commercial fertilizer on the yield of crops.Climatic conditions in 1953 were, in general, favorable for the small grain and corn crop. In some areas, however, the seeding of the small grain was delayed by the cool, wet weather. Plant diseases reduced the yields of small grains, especially some spring wheat varieties. The data from these field experiments serve as a guide for the determination of the kind and quantity of fertilizer to use and as a basis for estimating the effect of fertilizer use on crop yields. The crop response, resulting from fertilizer use, varies from year to year depending upon climatic conditions. The type of soil and the previous soil management practices may also have a considerable effect on crop response. This report gives the results of the fertilizer trials for 1953 only. The individual farmer may use the results of these experiments as a basis for the determination of the kinds of fertilizer and rates of application which are most beneficial for his particular soil and soil management system.

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Agricultural Experiment Station, South Dakota State College