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Fluid Journal : Fluid Journal 1993-1995
2 Fluid Journal Winter 1994 a 1:3 starter during four-year trials in Alabama (1984-87). These results, when combined with other observations, have led many to believe that high N starters are preferable to 1:3 starters, particularly when soil P levels have been built up to medium to high levels. Tillage. Reduced tillage is opening new opportunities for increased use of both nitrification inhibitors and starter fertilizers. Corn growers are turning to inhibitors to help boost corn yields in reduced tillage because increases in surface residues result in wetter soils and greater N loss. More and more are also turning to starters to overcome slow early season growth caused by cooler reduced tillage soils. For example, starters are recommended for no-till corn production by agronomists at Purdue University, but aren't recommended for corn grown under conventional tillage methods. Combination works Iowa. In 1988 studies, Anderson of Iowa State University applied N-Serve' nitrogen stabilizer with fluid starters. His results were quite dramatic as shown in Table 1. Near the end of the season, he observed that corn in plots receiving the inhibitor combined with either UAN or 10-34-0 (2 x 2 placement at planting) stayed green and continued to grow for several days after corn in all other plots in the trial matured and turned brown. Perhaps the stabilized starter stimulated greater root growth that was able to use the limited water supply more efficiently. Illinois. Numerous trials with starters plus a nitrification inhibitor have been conducted in several states since 1988. Corn yield responses have been frequent, but inconsistent. However, a pattern seems to be emerging. It appears that yield responses often occur following early season stress conditions such as dry or cool weather, or excessively wet weather. All these conditions can limit uptake of N or P. For example, in four corn grower trials in 1991, Ron Olson of Top Soil Testing Service Co. in Frankfort, Illinois, reported that nitrapyrin (N-Serve) combined with a starter produced 5.5 bu/A more than a starter alone. Responses were greater in fields where early season growing conditions were dry. Minnesota. Other situations where responses to a nitrification inhibitor in starters have occurred are in soils testing low in P and in situations where residual N03-N was high. One example of this is shown in Table 2. In these two trials on soils testing low in P, Rehm of the University of Minnesota observed a significant yield response on the site with high residual soil NO3, but not on the other site that had a much lower N level. Differences in plant P concentration were not detected among the treatments in this research and plant N concentration was not monitored. Early season effects on P uptake could have disappeared by the time the plants were sampled. Precautions When using N-Serve with fluid starters: 1) maintain agitation of the nitrification inhibitor/starter mixture or add a compatibility agent, 2) use only with 2 x 2 or similar placement techniques, 3) do not apply on the corn seed, and 4) use rate of one to two pints per acre. For other inhibitors, check with supplier. 1. Trademark of DowElanco. Jerry Huffman is a market specialist with DowElanco and is located in Champaign, Illinois. !
Fluid Journal 1996-1998