During the course of investigations on the cause of physiological breakdown

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A survey was conducted to determine the relationship between the yield of soybeans and the nutrient level of the soil. The yield of soybeans was related to the soil phosphorus level and the soil pH. When the yields of soybeans were placed into the various soil test categories for phosphorus, it was found that the lowest average yield was in the low soil phosphorus category and the highest average yield in the high soil phosphorus range. Studies in the greenhouse also showed that the yields of soybeans were related to the soil phosphorus level. The response of soybeans to the addition of phosphorus was dependent upon the soil phosphorus level. A much better evaluation of the effect of the phosphorus level of the soil on the yield of soybeans was obtained by placing the soils into categories ranging from low to very high than was obtained by use of rank correlation.

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