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Fluid Journal : Fluid Journal 1999-2001
1 Fluid Journal Winter 2000 se of conservation tillage, including ridge-till, has in- creased greatly in recent years because of its effectiveness in conserv- ing soil and water. In a ridge-till system, tillage at planting time is confined to a narrow strip on top of the ridge. The large amount of residue left on the soil surface can interfere with nutrient availability and crop uptake. Liquid starter fertilizer applications have been effective in enhancing nutrient uptake, even on soils testing high in available nutrients. Many producers favor in-furrow starter applications due to the low initial cost of planter-mounted equipment and problems associated with knives and colters in high-residue environments. Field experiments were conducted at our North Central Kansas Irrigation Experiment Field near Scandia. Our objective was to determine corn and by Dr. W.B. Gordon U Fl uid Star Fluid Star Fluid Star Fluid Star Fluid Starters Bump Y ters Bump Y ters Bump Y ters Bump Y ters Bump Yields in High P ields in High P ields in High P ields in High P ields in High P And High K Soils And High K Soils And High K Soils And High K Soils And High K Soils Kansasfield experiments on corn and soybeans compare two Ksources and two placement methods at varying application rates. Summary: In a three-year study (1997- 1999) fluid starter fertilizers bumped corn yields as high as 47 bu/A and soybean yields as high as 12 bu/A. The increases occurred even though soil test P and K levels were high or very high. Variables in application rates, placement, and fertilizer source also showed effects (both positive and negative) on corn and soybean response to starters. In general, salt injury from a sulfate of potassium (SOP) starter proved to be less than that of a potassium chloride (KCl) starter when applied in-furrow. soybean response to starters in soils testing high in P and K, using two different fertilizer sources (sulfate of potassium [SOP] and potassium chloride [KCl]) two different placement methods (in-furrow and 2 by 2), and Figure 1. Effects of placement, rate, and potassium source of 7-21-7 fluid starter on corn yield, Scandia, KS, 1997 Yield-bu/A SOP 240 210 180 150 120 90 60 0 In-furro w 2x2 Check Rate of application - lbs/A KCl 50 100 200 50 100 200 50 100 200 50 100 200 Figure 2. Effects of placement, rate, and potassium source of 7-21-7 fluid starter on soybean yield, Scandia, KS, 1997. Yield-bu/A SOP 80 75 70 65 60 55 50 45 0 In-furrow 2x2 Check Rate of application - lbs/A KCl 50 100 200 50 100 200 50 100 200 50 100 200
Fluid Journal 1996-1998
Fluid Journal 2002-2004