Manganese can do soybeans a lot of good in many situations, according to field projects and trials by DuPont Pioneer agronomists. Here's a brief summary of what area agronomist Keith Diedrick has found.
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- Soybeans are more often deficient in manganese than in other micronutrients, and respond well to manganese fertilizers when deficient.
- Manganese is more likely to be deficient in sandy soils, dry soils, high organic matter soils, and soils with high pH levels.
- Fields with manganese deficiency are seldom affected uniformly. Manganese deficiency symptoms may also vary from field to field, and are strongly tied to soil properties.
- Plant tissue analysis is the best tool for confirming a manganese deficiency. Randomly select a number of plants, picking the youngest fully-opened trifoliate from each.
- To correct manganese deficiencies, a number of manganese sources may be used, with preference to chelated forms of manganese (as opposed to salt forms) supplied by foliar application.
To avoid weed control efficacy and nutrient absorption issues when tankmixing with glyphosate:
- Use the label-recommended rate of spray-grade ammonium sulfate (usually 8.5 to 17 lb per 100 gallons) in the carrier, and
- Add the products in the correct order: 1) water, 2) AMS, 3) glyphosate, 4) chelated manganese (EDTA preferred).