Soil testing and recommendation for boron in Minnesota. However, signs of boron toxicity may appear when plants are exposed to higher concentrations of the mineral. The results of plant analysis are reported as precise numerical concentrations in the parts per million (ppm) range, which can be compared to previously established critical levels and sufficiency ranges. I consent to receive email updates from Compass Minerals. All Rights Reserved. Boron is an essential element that occurs naturally in soil, usually in low concentrations that present no risk to plants. Low boron concentrations in plant tissues which were sampled prior to flowering and seed development can be corrected by prompt foliar spray applications of Solubor®. Tweet us your questions at @WolfTraxInc, or comment on this blog. Watch this short video presentation from Compass Minerals for a quick overview on: There are two times of the season when boron applications can be most beneficial to an alfalfa stand: What’s the best boron fertilizer product for alfalfa? Boron should not be applied without a test since over-application can lead to toxicity, and there is not much difference between levels that help and levels that hurt. Even though it may be too late to make soil applications after boron deficiencies are diagnosed through plant analysis, it is important to recognize that a problem exists so that corrective fertilizer applications can be made for the next crop. Collecting tissue samples When specific sampling instructions are not given for a particular crop, the general rule is to sample the most recently matured leaves. Accurate analysis requires that plant tissue samples be carefully collected and handled prior to shipment to the laboratory. Extreme care should be taken when selecting the plant part to be sampled. A nutrient supplement that contains kelp will give plants a much need boost of boron, along with the added benefit of calcium and magnesium.. Another method a lot of gardeners and growers like to apply is with the use of borax or boric acid. The benefits of using Wolf Trax Boron DDP instead of a granular micronutrient have been shown in third-party studies that evaluated yield and relative feed value. Because it is required in small amounts, it … Boron applications should be made to bring mature leaf tissue to between 20 and 100 ppm. Fertilizers containing boron vary in the solubility of the element, and application equip-ment may need continuous agitation to keep the product from settling to the bottom. Because the season for the most effective foliar application of boron is short, foliar sprays must be prepared quickly and accurately. Boron sufficiency ranges of many agronomic and horticultural crops are listed in Agronomy Note: Boron Deficiency Symptoms. If the plants were dusty, dust the sampled plant parts off with a light brush or wash to remove contaminants (use distilled water if possible). Soil samples should be collected along with plant tissue to confirm whether a deficiency if present. We use cookies to remember you and learn how you use these pages. The boron content of a plant, or one of its parts, also serves as a reflection of the available boron status of the soil for the period a few weeks prior to tissue sampling. These may include: Lavender; Oleander Boron applications should be made to bring mature leaf tissue to between 20 and 100 ppm. ... With more points of interception, alfalfa plants can more readily access the nutrient for quicker uptake. All rights reserved. Boron uptake by plants is controlled by the boron level in soil solution rather than the total boron content in soil. Elemental composition of plants varies with age, the portion of the plant sampled and other factors. Many alfalfa fertilizer recommendations include boron. If you agree, click accept. Ideally, for healthy and productive soil you should aim for a boron concentration of 0.5‑4 mg/kg. Crops exhibit very little control of B uptake. Learn more about Rio Tinto. Boron deficiency can occur when the pH of the growing medium exceeds 6.5, because boron is tied up and unavailable for plant uptake. In timing your sampling regimen, use growing degree units (GDU). Place air-dried samples in a clean paper or cloth container and close the shipping container to avoid contamination. Consequently, plant B accumulation is directly related to transpiration and soil B availability. There can be a large variation in boron concentrations among the different parts of the same plant. Interpreting analysis The success of plant analysis as a diagnostic technique depends on the interpretation of the test results. Tissue samples taken from both normal and abnormal areas in the field can assist in the diagnosis of possible boron nutritional problems. Tables listing deficient, sufficient, excessive and intermediate levels or ranges of boron, which have been established by research, can be obtained and also are used to interpret plant analysis results. Carefully read and follow the instructions for products containing boron. Examples are shown in Table 2 above. I understand that I can unsubscribe at any time. Once the plants have been sampled, proper handling of the sample becomes very important. Boron uptake is a passive (non-metabolic) process. When to Apply Boron Fertilizer Products on Alfalfa Fields, When should growers consider applying boron fertilizer products to alfalfa fields, After the first cutting to ensure there is enough boron to reach good yields and feed quality for the rest of the season’s cuttings, After the last cutting to help ensure a healthy alfalfa stand in the fall that is more resilient to winter injury – and to ensure a better start next spring.