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Fluid Journal : Fluid Journal 2005-2007
Early Spring 2005 Fluid Journal 2 are grown in cropping rotation. Seed and hope? The typical management program for too many of our current soybean producers is to plant the seed, spray RoundUp throughout the growing season, and hope and pray they get a crop. For some producers, this kind of program may be acceptable; but for top producers, such a program is unacceptable and falls short of profitable production levels. Six-step program From the Twin State, Inc. Agronology 10 Research Center, as well as university research, a proven recipe for high- yielding soybeans has been formulated. The specific elements of this recipe are outlined in a six-step program that directs the grower to: • plant early • use fungicidal seed treatment • select varieties with defensive traits • use narrow rows • directly fertilize the soybeans • kill damaging insects and control soybean diseases. The results of this total soybean management program are fully attested to in Table 2, showing the yield levels attained in the new millennium at Twin- State's Agronology 10 Research Center in Walcott, Iowa. By using our "Recipe for High-Yielding Soybeans" program, we have controlled downside risks not only for ourselves but also for our growers, and greatly enhanced their yield opportunities. Averaging 71.5 bu/A In each of the last four years, the top-yielding 18 or 20 plots (total of 74 over four years) have been reviewed. The combined yield average of these 74 plots is 71.5 bu/A. Of these 74 high- yielding plots, approximately 80 percent were directly fertilized in the fall with a dribble band fertilizer application of 13- 40-80, which would approximate the phosphorus (P) and potassium (K) removal values for a 60 bu/A soybean crop (x-36- 84). The addition of 10 lbs/A of sulfur (S) via ammonium thiosulfate (ATS) to fall dribble-applied 13-40-80 has enhanced yields by an average of 3.4 bu/A (Table 3). Selecting varieties Thus far, we have shown the value of fertilization in a high-yielding recipe for soybean production. While your growers may well be focused on their fertility needs, they need to be equally focused and educated concerning varietal selection. Items that need their attention include: • maturity grouping • disease rating 1. phytophthora -- needs Rps 1k or Rps 1c 2. brown stem -- medium to high field tolerance 3. white mold -- high tolerance is best 4. sudden death -- desire moderate resistance (MR) 5. other conside rations : a. soybean cyst - new cyst hybrids b. iron chlorosis c. emergence scores. No half way To gain maximum benefi ts for soybean yields, the entire recipe (six- step program) for high-yield soybeans must be followed. Each component adds to the overall yield potential of the soybean crop. Advise your grower that there is no halfway on this. To become a top soybean producer, he must adopt the six-point program outlined in this article, or a production plan similar to it. Ken Washburn is senior agronomist at Twin-State, Inc., in Davenport, Iowa.
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