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Fluid Journal : Fluid Journal 1996-1998
Fall 1997 Summary: Starter fertilizer containing N and P increased V-6 dry weight compared to no-starter check for all corn hybrids tested under reduced-till conditions. Grain yield of two corn hybrids (Pioneer 3563 and DeKalb 646) did not respond to starter, regardless of elemental composition. Starter containing N and P increased grain yield of Pioneer 3346 and DeKalb 591 by 54 and 50 bu/A, respectively, compared to check. Additions of sulfur (10 lbs/A) to starters produced an additional increase in V-6 dry weight for all hybrids, and grain yield increases for Pioneer 3346 and DeKalb 591. Additions of K and Zn to starters did not produce additional benefit. Starters containing N and P increased grain sorghum yield of DeKalb 40Y and 48 by 22 and 25 bu/A, respectively. Yield of two grain sorghum hybrids (Pioneer 8699 and Northrup King KS 735) did not respond to starters. Additions of K, S, and Zn did not significantly increase dry matter production or yield for any grain sorghum hybrid. _________________________________ Conservation tillage production systems are being used by an increasing number of farmers in the central Great Plains. Early-season growth is often poorer in conservation tillage than in conventional tillage. Cool soil temperatures at planting can reduce nutrient uptake of crops. Fertilizer placed in proximity to the seed at planting can alleviate the detrimental effects of cool soil temperatures on plant growth and development. Previous research at the North Central Kansas Experiment Station found that some corn and grain sorghum hybrids grown in reduced-till responded well to starters containing only N and P while others did not. Little is known about variability in responsiveness of corn and grain sorghum to starters containing a full range of nutrients.Objectives of these experiments were: • determine the variability in starter responsiveness between corn and grain sorghum hybrids grown under reduced tillage conditions • ascertain whether variability in starter responsiveness between corn and grain sorghum hybrids is influenced by starter composition. V-6 stage---corn Starter combination. Figure 1 shows how the combination of N and P improved V-6 stage dry matter production of all hybrids tested, com- pared to check. Note how additional response was achieved with inclusion of sulfur in the starter mix. However, introduction of K and Zn into the mix did not result in any additional V-6 stage dry matter production. Hybrid. The differences in response of hybrids to starters are also shown in Drs. W.B. Gordon and G. M. Pierzynski Response To Starter Combinations Varies With Corn/Sorghum Hybrids Kansas first-year trials using fluid combinations suggest responses can be economical for some hybrids, even on soils that are not low in available nutrients.
Fluid Journal 1993-1995
Fluid Journal 1999-2001