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Fluid Journal : Fluid Journal 2005-2007
EARLY 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 . at Waseca in 2001-02 compared fall, spring preplant, planting time, and sidedress applications along with N sources and method of application in a "one-pass" tillage system. N treatments received 100 lbs/A, a rate about 15 percent less than recommended for an expected yield of 150 to 174 bu/A, but used so differences in application method/ timing could be more clearly identified. Plots were field cultivated following broadcasting preplant urea and UAN. Dribble treatments were applied to soil surface within 2 inches of seed row with planter. Sidedress treatments of UAN were coulter- injected 4 inches deep midway between the rows at the V3 stage. Averaged across both of these wetter-than-normal growing seasons, grain yield (Table 3) and N recovery were greatest when a majority of the N (60 lbs/A) was sidedressed as UAN.Yields were not statistically lower when a combination of either 20 or 40 lbs/A of N was sidedressed in conjunction with N at 80 or 60 lbs/A as fall-applied anhydrous ammonia with N-serve.Yields and N recovery were significantly lower when 80 or 60 lbs/A was applied in the fall and the remaining 20 or 40 lbs/A as UAN was dribbled next to the row at planting. Because phytotoxicity symptoms were not observed, we concluded that some of the surface-dribbled UAN was lost to the atmosphere. However we cannot dismiss the fact that some phytotoxicity may have affected early root growth, but we never observed it. Dr. Randall is soil scientist/professor and Dr. Schmitt was formerly extension soils specialist and is now associate Dean, College of Food, Agriculture and Natural Resource Sciences, University of Minnesota.
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