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Fluid Journal : Fluid Journal 2002-2004
0-44-0. However, the significant interaction between sugar beet response to rates of dry broadcast P and liquid banded P is obvious from the total lack of response to dry broadcast P when 10-34-0 was banded in the furrow with the seed (Figure 1). Banding 3 gal/A of 10-34-0 yielded nearly 20 tons/ A when no granular P was Figure 2. Sugar beet root yield re- sponse to various rates and sources of banded P fertilizer. broadcast and nothing more when granular P was broadcast. This verifies the improved efficiency of banding liquid P relative to broadcasting dry. Banding 3 gal/ A of 10-34-0 supplied about 12 lbs/A of P 205 and resulted in a sugar beet root yield similar to that observed with 60 lbs/A of P205 broadcast as granular 0-44-0. Growers have raised ques- tions about whether dry P fertiliz- ers can be substituted for liquid 10-34-0. Sugar beet root yields with banded dry fertilizer (11-52- 0) were similar to liquid fertilizer, but only at higher application rates. Figure 2 illustrates sugar beet root yield differences among the various banded P fertilizer sources and rates. This was consistent with 2001 results where 11-52-0 at 11 to 12 lbs/A of P205 resulted in yields of 1.5 to 2 tons/A less than 3 gal/A of 10-34-0. 25 20 15 10 5 0 Check lbs/A-PO 25 Root Yield (tonsA) *3 gal/A 10-34-0 *** 5 gal/A 10-34-0 ** 4 gal/A 10-34-0 **** 11-52-0 12* 16** 20*** 12**** 16**** 2 Fluid Journal Late Spring 2003 Sucrose. Recoverable sucrose followed similar trends because of little or no effect of banded P on net sucrose concentration. We have not been able to get a response of sucrose concentration or loss to impurity (referred to as loss to molasses or LOM) with any P fertilizer treatment either broadcast or band. Summary Our 2002 data suggest that banded dry fertilizers are effec- tive, but may require a higher rate than liquid fertilizers. We are currently examining new ways of doing in-season work. Dr. Sims is associate professor of soil science and Dr. Smith is associate professor of agronomy, Northwest Research and Out- reach Center, University of Minnesota.
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