Differentiating and Understanding the Mehlich 3, Bray, and Olsen Soil Phosphorus Tests
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The Department of Agronomy seeks to teach the study of the farm-field, its crops, and its science and management. It originally consisted of three sub-departments to do this: Soils, Farm-Crops, and Agricultural Engineering (which became its own department in 1907). Today, the department teaches crop sciences and breeding, soil sciences, meteorology, agroecology, and biotechnology.
History
The Department of Agronomy was formed in 1902. From 1917 to 1935 it was known as the Department of Farm Crops and Soils.
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1902–present
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- Department of Farm Crops and Soils (1917–1935)
Related Units
- College of Agriculture and Life Sciences (parent college)
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Abstract
Soil testing is the key component for determining the need for phosphorus (P) fertilization. Also, if fertilization is required, test results guide the rate of application recommended to optimize production. Through extensive laboratory, greenhouse, and field research studies, soil tests are calibrated against the expectation of response to applied P. That is, the research determines both the relative index of P availability to the crop being grown and an indication of the probability and magnitude of yield increase one should expect when P is applied – thus providing the interpretation of test results. This research also determines which test is best at predicting available P and crop response to P application.