AGRONOMIC NEWS ITEMS
From Agronomists of the
Potash & Phosphate Institute
655 Engineering Drive, Suite 110
Norcross, Georgia 30092-2837
Phone (770) 447-0335
Spring 2004, No. 6
• Reduced grain moisture at harvest.
• Improved nutrient and water use efficiency.
• Increased yield and crop quality.
Another important factor in considering the potential of starter fertilizer is residue level and degree of tillage. High levels of crop residue increase the potential of a profitable response to starter due to prolonged cool, wet spring soil conditions. Also, with reduced tillage, stratification of immobile nutrients such as phosphorus and potassium is increased, resulting in a greater potential for response to subsurface banding, especially for potassium.
When starter is applied in a 2x2 (2 inches to the side and 2 inches below the seed) placement, the chance of injury and stand reduction from salt damage is negligible. However, where fertilizer is applied as a pop-up in-furrow with the seed, care should be taken to avoid seedling injury, stand reduction, and yield loss. The amount of fertilizer that can be used depends on fertilizer source, crop, row width, and soil moisture. For example, South Dakota State University recommends for corn in 30-inch rows no more than 10 pounds of nitrogen plus K2O, up to 100 pounds per acre of material as 0-46-0, and no urea.
The use of starter fertilizer is an effective management practice that is based on sound agronomic principles. However, in most cases it should not be used as the sole fertility program. The best approach to starter is to view it as a catalyst for a crop that will have adequate and balanced available nutrients in the soil rooting volume as the season progresses. So, as you make plans for the spring season, don’t overlook the potential benefits of a starter fertilizer application.
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