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Fluid Journal : Fluid Journal 2005-2007
22 Fluid Journal SPRING 2007 after planting, nutrients that are band-placed close to the corn row are more likely to be available for corn-plant uptake than if the same amount of nutrients were broadcast over the entire soil surface. An example of enhanced N availability from starter band placement is shown in Figure 2. The percent N in whole corn plant tissue samples collected six weeks after planting (knee-high) was approximately the same with either starter band application of 30 lbs/A of N, or a surface broadcast application of 60 lbs/A of N plus 10 lbs/A of N in a starter band. The starter band N was more efficient in supplying N to the young corn plants. Data from our studies show that optimum starter-band N rates ranged from 27 to 70 lbs/A of N for the nine experimental sites, all of which were no-till planted into wheat double-crop soybean residue. Optimum sidedress N rates ranged from 0 to 125 lbs/A of N as yield potential varied due to varying weather conditions for these mid- Atlantic Coastal Plain regional sites. Detailed analysis of the starter-band placement data demonstrated that essentially all the yield advantage for the higher starter-band N treatments could be obtained with a 50 lbs/A of N starter-band application. The 50 lbs/A of N starter-band application also reduced the potential for salt injury compared to 60 or 70 lbs/A application, and provides room in the starter fertilizer for additional K or other nutrients. The most important aspect of these data is that higher rates of starter band N are the most efficient way to apply early-season N. Optimum sidedress N rates varied from0to125lbs/AofNinour experiments. These data are typical of Virginia conditions and result from two factors. First, large amounts of N can be released from sources such as manures and/or previous legume crop residues. When fields have a history of manure, or the corn crop is following a legume such as alfalfa, we recommend using an in-season test such as the pre-sidedress soil nitrate test (PSNT), a calibrated SPAD meter evaluation, or optical sensors to determine the sidedress N rate. Second, while drought stress will limit corn yield response to sidedress N applications in some cases, the starter band N applications of 50 lbs/A of N always ensure that early-season growth is not limited by lack of N availability. Cor n P response Phosphorus fertilizer needs were also assessed and grain yield responses to starter P rates determined in nine field experiments. EZ-Start manufactured by NULEX®, INC. Sioux City, Iowa • Ph: 800-831-4815 www.Nulex.com EZ-Start Liquid Potassium Phosphate 0-19-21 makes it easy to supply customers high-analysis fertilizer grades with a very low salt index. Grades made from KCl 7-21-7, SI = 0.80 9-18-9, SI = 0.48 8-20-5, SI = 0.61 Grades made from EZ-Start 6-27-7, SI = 0.33 (59% less) 3-18-9, SI = 0.26 (46% less) 5-25-10, SI = 0.30 (50% less) Compare the Salt Index of Grades Made with EZ-Start Put the power of potassium phosphate in liquid form to work for you. This is the year to grow more corn. Simply mix 10-34-0 or 28% UAN with EZ-Start and produce grades like 5-25-10, 9-18-9, 3-18-9, 18-6-3, 6-27-7, 6-24-6, 18-6-3 and many more. All grades have a low salt index, are free of chlorides, high in water solubility, and can be stored at low temperatures.
Fluid Journal 2002-2004
Fluid Journal 2008-2009