Boron deficiencies may be suspected on coarse-textured soils where organic matter content is low, on soils with a pH above 6.0, and on recently limed soils. Soil testing and plant analyses are both helpful in assessing the potential boron-supplying capacity of the soil and the current boron status of the plant. Recent research has shown that three commonly used soil tests, the Mehlich-1 and -3 tests and the DTPA test modified to include sorbitol, also may be used to determine available boron in soils. The hot water test (HWT) is the most common, however. The critical value of available boron in a soil test may be affected by soil and the environment, which must be considered in interpreting soil test results.