Sign up for email alerts of new Fluid Journal issues!
Fluid Journal : Fluid Journal 2005-2007
Early Spring 2006 Fluid Journal 2 Soil effects. For most of the treatments, emergence was greater than 100 percent of the control. These observations agree with a general perception that fertilizer banded near the seed will frequently improve emergence. Corn was planted on April 19 at the site with loamy fine sand texture and on April 27 at the site with silty clay loam texture. In both cases, the soil was cold and wet at planting depth. With these conditions, fertilizer near the seed would be expected to improve crop emergence. It is notable that 10-34-0, regardless of placement, reduced crop emergence when applied at a high rate to loamy fine sand. This effect was also measured when 10 gal/A of 10-34-0 was applied with the seed in silty clay loam soil. At a rate of 10 gal/A, more N was applied with the 10-34-0 compared to the4-10-10. These stand measurements indicated that the N near the seed at high rates was responsible for reduction in corn emergence. Sugarbeet emergence varied with soil texture. The positive effect of fertilizer, regardless of treatment, was measured at the site with a silty clay loam texture. By contrast, treatments appeared to have negative effect on crop emergence at the site with a sandy loam texture. Variability in emergence was substantial at this site. This variability may have masked positive or negative effects. Because of this variability, it is not possible to arrive at a firm conclusion for the sandy loam texture site. Rainfall effects. Because of above- average rainfall from mid-May through mid-June, soybean planting was delayed until June 6. The soil was very wet at the time of planting. Therefore, soybean emergence was not affected by treatment. This observation is not consistent with observations in past research projects. Excess soil moisture at planting in 2004 probably buffered any effect of the applied fertilizer. Yield Corn yields (Table 2) were excellent even though the growing season was much cooler than normal. Treatment had no significant effect on yield at the site with silty clay loam texture. Although the application in contact with the seed (10-34-0 at a rate of 10 gal/A) appeared to cause a reduction in emergence, the reduced emergence was not reflected in grain yield. For the site with loamy fine sand texture, most treatments increased yield compared to the control. Statistical analysis showed that the main effects evaluated (material, rate, and placement) had no significant effect on yield. However, there was significant interaction between material and rate. This interaction was the result of the lower yields associated with the application of a high rate of 10-34-0 when averaged over three placements. When averaged over the two rates, yields were higher when the 10-34-0 and 4-10-10 were applied with the seed. This was not the case with 3-18-18. Thus, there was a significant interaction between material and placement. Sugarbeet yield at the site with silty clay loam texture was significantly affected by material and rate (Table 3). There were no significant interactions. When averaged over placement and rate, yields were higher when 10-34-0 was applied. When averaged over material and placement, yields were higher when the high rate was used. For the site with sandy loam texture, yield was only significantly affected by material. When averaged over placement and rate, yields were lower when 3-18-18 was used. Soybean yields were seriously affected by the cool summer, late planting, and an early frost and are not reported here. Dr. Rehm and Dr. Lamb are nutrient management specialists at the University of Minnesota. Dr. Bredehoeft is a research agronomist for Southern Minnesota Beet Sugar Cooperative. Table 2. Corn yield as affected by appication of two rates of three fertilizers at three positions near the seed at planting, 2004. Table 3. Sugarbeet yield as affected by application at two rates of three fertilizers near the seed at three positions near the seed at planting, 2004.
Fluid Journal 2002-2004
Fluid Journal 2008-2009