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Fluid Journal : Fluid Journal 2005-2007
SPRING 2007 Fluid Journal 23 "More yields. More profits. What's not to like?" Get more yieldfor less. Call 913-764-7766 for more details. Or email us at firstname.lastname@example.org or email@example.com. or visit us on the web at www.evansenterprisesllc.net . Data in Table 1 illustrate that soil test calibrations of medium to very high are indicative of sites that show little response to added P fertilizer. This is expected as calibrations for high soil test levels mean that a low probability of yield response to applied fertilizer is expected. Only one grain yield response to applied P was found in these studies. However, as yield levels have increased with improved genetics in recent years, and more reduced tillage is being practiced, if any crop response is going to occur to applied P, it is most likely to be found in starter-band applications. Therefore, we recommend that all P be band-applied for no-till planted corn on soils testing medium or higher for plant-available P. N:P ratios Data from these trials clearly indicate that relatively high rates of N are needed in starter band fertilizers, and that P applications can be determined by soil testing. Our recommendations for corn are to apply50lbs/AofNina2x2starter band in conjunction with needed P uptoarateof50lbs/AofP2O5inthe starter band. This rate of P covers the vast majority of soils used for corn production in the mid-Atlantic region. In most cases, either a 1:1 N:P ratio starter fertilizer such as 15-15-0 can be used, but on high-available P soils, starter fertilizers with ratios of 2:1 N:P, such as 20-10-0, are being used to maximize corn response to N, assure adequate early-season P, and optimize both N and P efficiency. Dr. Alley is W.G.Wysor professor of agriculture,VA Tech; Mr. Martz is general manager, Mid-Atlantic Division, Crop Production Services, and Dr. Thomason is extension grains specialist,VA Tech.
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