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Fluid Journal : Fluid Journal 2005-2007
Winter 2006 Fluid Journal 3 all locations in the regional cotton study, but was not measured for each field treatment plot. If soil test B values are determined for each plot in future work, along with leaf tissue B and yield, we can go one step farther to verify soil test B interpretations we are using for various soil and crop situations. To illustrate this approach, a graph of the data from an alfalfa study is shown in Figure 3. A linear regression of alfalfa tissue B on soil test B values was calculated. Using values of B tissue sufficiency ranges in alfalfa, the corresponding ranges of soil test B for deficient, critical, and adequate soil test values for B may be determined by drawing a horizontal line for the leaf tissue value on the vertical axis to a point on the regression line and dropping the vertical line to the corresponding soil test value on the horizontal axis as illustrated. By this procedure, one small set of data can provide a soil test interpretation for a given crop on a given soil type. In this example, where soil test B is less than 0.75 ppm, the probability of a B yield response is high. Soil test values between 0.75 and 1.75 ppm B indicate the need of maintenance fertilization, and no B would be suggested where soil test B exceeds 1.75 ppm. Currently, regional B projects in the Mississippi Delta with rice and soybeans are providing some excellent data showing the relationship between yield and plant tissue B, which will greatly aid predictions of the need of B fertilization on these crops. Dr. Woodruff is an ag consultant with U.S. Borax. He presented this information in a talk entitled "Interpretation of Soil and Plant Analyses for Boron in Southern Crops" at the Oct. 2004 Southern Nutrient Management Conference in Olive Branch, MS.
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