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Fluid Journal : Fluid Journal 1996-1998
2 Fluid Journal Summer 1996 230 220 210 200 190 180 170 160 ICI 8599 Poineer Pioneer Dekalb Dekalb ICI 8599 Pioneer Pioneer Dekalb Dekalb Pioneer 3563 3346 636 591 3563 3346 636 591 3394 1993 1994 Yield - bu/A with Starter without Starter Figure 1. Effect of hybrid and starter fertilizerrrrr on grain yield of corn, Gordon, et al., Belleville, KS 1993-94. 26 22 18 14 10 6 2 0 Uptake - lbs/A N P N P 1993 1994 with Starter without Starter Figure 2. Effect of starter fertilizer on V6 stage whole plant P and N uptake of corn, averaged over all hybrids, Gordon, et al., Belleville, KS 1993-94. company's description of outstanding early-season growth characteristics under cool soil temperature conditions. The yield of Pioneer 3394 in 1994 was 15 bu/A higher with starter than without. Early-season vigor. When averaged over starter treatments, early-season dry matter production was greater for Pioneer 3394 (rated good early-season vigor) than for ICI 8599 (rated poor early-season vigor), yet starter fertilizer consistently improved grain yield of Pioneer 3394 but not of ICI 8599. Early-season vigor rating does not appear to be a good indication of grain yield response to starter fertilizer. Mid-silk. For dryland corn production, it is important to have the crop pollinate before the hot, dry period that usually occurs in early July. Number of days from emergence to mid- silk was reduced in all hybrids except IC! 8599. When averaged over all hybrids, the number of days from emergence to mid-silk was reduced by five days. P uptake. Starter improved total P uptake (grain plus stover) in some hybrids but not in others as shown in Table 1. Dry matter. Starter fertilizer improved dry matter production at the V6 growth stage in all hybrids. When averaged over all hybrids and years. starter fertilizer increased dry matter production by 358 lbs/A. Growth differences to starter fertilizer were still evident at the V10 growth stage. NP uptake. Starter increased N and P uptake at the V6 growth stage in all hybrids. When averaged over all hybrids, starter nearly doubled N and P uptake in 1993 and almost tripled N and P uptake in 1994 (Figure 2). Earleaf concentrations. In both 1993 and 1994, earleaf N and P concentrations at silking were improved by the use of starters. Methodology Site. Field experiment was conducted at the North Central Kansas Experiment Field near Belleville, Kansas, starting in the spring of 1993. The no-till site had been in sorghum for two years prior to the establishment of this study.
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