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Fluid Journal : Fluid Journal 2005-2007
F all 2005 Fluid Journal 2 Soil temperature in the early growing season was warmer in the strip-till system than in the no-till system. Final stand. Although final stand did not differ in the two tillage systems, plant emergence in the strip-till system reached 100 percent 3 days sooner than in the no-till system. Timing. Under Kansas conditions, fall-applied fertilizer was as effective as spring-applied. Split applications of fertilizer did not significantly improve yields over applying all in either the spring or the fall. 2004 In 2004, rainfall was above normal in May, June, and July. A hail storm in early June did reduce plant population by an average of 12 percent but surviving plants developed normally and grain yields were very good. When averaged over fertility treatment, strip- till plots yielded 16 bu/A more than no- till plots (Figure 1). As in 2003, early- season growth was increased and days from emergence to mid-bloom were decreased in the strip-till system. Soil temperature in the early growing season was warmer in the strip- till system than in the no-till system (Figure 2). Soil temperature differences between the two tillage systems persisted into late May. Final stand. Although final stand did not differ in the two tillage systems, plant emergence in the strip-till system reached 100 percent 3 days sooner than in the no-till system. Yields in the strip-till system were greater than no-till at all levels of applied fertilizer (Figure 3). Timing. Under Kansas conditions, fall-applied fertilizer was as effective as spring-applied (Figure 4). Split applications of fertilizer did not significantly improve yields over applying all in either the spring or the fall (Figure 5). Conclusion Strip-till proved to be an effective production practice in both low- and high-yielding environments. Strip-till does provide a better early-season environment for plant growth and development, while still preserving a high amount of residue on the soil surface. This system may solve some of the major problems associated with conservation-till, thus making it more acceptable to producers. Methodology Location. This experiment was conducted at the North Central Kansas Experiment Farm near Belleville, Kansas. Soil was a Crete silt loam to compare strip-till and no-till systems for dryland corn production. Fertilizer treatments consisted of 40, 80, or 120 lbs/A of N with 30lbs/A of P2O5, 5 lbs/A of K2O, and 5lbs/A S. An unfertilized check plot was also included. Timing. In the strip-till system, fertilizer was applied in the fall at the time of strip tilling or in the spring at planting. In the no-till system, fertilizer was applied in the spring at planting. Tillage. Strip-till was performed in wheat stubble in early October in both years of the study. The zone receiving tillage was 5 to 6 inches wide. Placement. Fertilizer was placed 5 to 6 inches below the soil surface in the fall with the strip-till system. Spring- applied fertilizer was place 2 inches to the side and 2 inches below the seed at planting. Nutrient sources were 28% UAN, 10-34-0, and potassium thiosulfate. Dr. Gordon is professor in the Department of Agronomy at KSU. Figure 3. Corn grain yield as affected by tillage and spring-applied fertilizer, Belleville, 2004. Figure 4. Corn grain yield as affect by fall- or spring-applied fertilizer in the strip-till system, Belleville, 2004. Figure 5. Corn grain yield as affected by timing of fertilizer application in the strip-till system, Belleville, 2004.
Fluid Journal 2002-2004
Fluid Journal 2008-2009