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Fluid Journal : Fluid Journal 1996-1998
2 Fluid Journal Summer 1998 lbs/A of S. Figure 1 indicates that N available for organic matter production would have been largely consumed in the process. It is significant that the constant rise in organic matter content parallels the yield curve (as indicated by the crop removal line in Figure 1). Interestingly, over a 12-year period in Kansas a similar increase of 0.2 percent organic matter was recorded with high fertility rates in a soybean-wheat-grain sorghum rotation where residue amounts were doubled. Deep tillage a must As described in the spring issue of the Fluid Journal, Warsaw used a twist shank chisel to move stable organic matter as deep as 15 inches and gain MSP. Childs uses a mini-moldboard plow that leaves 28 to 30 percent residue on the surface. This process provides what Childs describes as a "very loose" soil environment in which to build good corn root systems for the following spring's seed population. An added benefit of the residue left on top, Childs claims, is less soil erosion. In the past, getting good root development was Childs' big challenge. When he found soil compaction at 8 or 9 inches, this limited root growth and corn yields usually went down. Deep tilling and moving stable organic matter as deep as 15 inches solved his problem. The incorporated decomposed residue (stable organic matter) produced a porous soil with high water-holding capacity to support the extremely high plant populations required to produce over 300 bu/A. For more information about MSP, call or write the Fluid Fertilizer Foundation, 2805 Claflin Rd., Suite 200, Manhattan, KS 66502, (785) 776-0273.
Fluid Journal 1993-1995
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