Boron addition is often recommended for these crops. Perennial legume forage crops, including alfalfa, clovers and birdsfoot trefoil are sensitive to low soil boron. Some crops are much more sensitive to boron deficiency than others. In coarse-textured soils, this leaching is likely when wet conditions prevail. Boron is not bound to clay or organic matter particles and leaches through the soil profile readily, similar to nitrogen. Coarse-textured soils, especially those low in organic material, are the most common places where boron deficiency occurs.Ĭoarse-textured soils are more prone to drought and, when soils are very dry, decomposition of organic material slows, sometimes causing boron deficiency. Many, if not most, Michigan agricultural soils contain adequate boron for good plant development. The source for this boron is mostly from decomposing organic matter in the soil. Plant-available boron exists in soil mostly as a neutral boric acid molecule. Coarse-textured soil low in organic matter.There are two main reasons why boron is routinely recommended: Special tests for soil content of nitrogen and boron are available through MSU Soil and Plant Nutrient Laboratory and other reputable labs. Instead, it is based on many years of accumulated research results regarding crop response to boron. Like nitrogen, the boron recommendation is not based on chemical analysis of your regular soil sample. Even though you didn’t request a special soil test for boron when you sent your samples into the Michigan State University Soil and Plant Nutrient Laboratory, you might have received a recommendation to add 1 or 2 pounds for boron per acre for your selected crop.
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