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Fluid Journal : Fluid Journal 1996-1998
1 Fluid Journal Summer 1997 Summary: Two sites were used for our study At Dixon Springs, corn grain yield increased significantly with fluid starters compared to control. At Belleville, no yield differences were observed with the use of starters. Apparently, late planting, nearly ideal summer growing conditions, and high soil P and K levels at this site precluded any responses. At both locations, N-Serve addition in the fluid starters had no influence on yield. However, its inclusion in starters did result in significant early growth increases at Belleville. Starters also had a significant effect on early corn growth at both locations, with N and P combinations working best at Dixon Springs, while N-only in the starter worked best at Belleville. The plant and yield responses observed in 1996 generally followed a similar pattern to those found in 1994 and 1995 at the two sites. Starters have a well established history of enhancing early nutrient uptake, growth, and yield of corn. In trial after trial, scientists have reported consistent responses in a wide range of soils using conservation practices, and in cool/wet soils---even under high-testing soil environments. Providing nitrification inhibitors has been shown to improve N use. Similarly, applications of chloride have enhanced grain yield. To further explore the effects of starters on corn yields, we initiated a three-year study in 1994 to: • evaluate the influence on corn nutrient uptake and yield of phosphorus, potassium, and chloride, under a fixed ammonium-N component included with a starter Drs. E,C. Varsa and S.A. Ebelhar Corn Yield Responses to Starters Vary with Climatic Conditions Nitrapyrin additions to fluid starters have significant effect on early growth in 1996 trials conducted by Illinois researchers. • determine the effect of nitrapyrin inclusion (to retain a high level of ammonium-N in starters) on nutrient uptake and yield in corn. Following is a report on the final 1996 phase of our three-year study. Climate impacts response Early-season wetness delayed corn planting until May 24 at Dixon Springs and May 31 at Belleville. Poor emergence and bird damage necessitated replanting at Belleville on June 24. Even after the second planting, the stand of corn on no-till plots was unsatisfactory for making meaningful research comparisons. Therefore, only results from the chisel-tilled plots at Belleville are presented. On average, the region experienced a cooler than normal summer, which reduced the severity of moisture stress when it occurred. Yield. At Dixon Springs, corn grain yield was significantly affected by starter treatment but not by N-Serve inclusion with starters or tillage treatment employed (Figure 1). Not only did nitrogen addition to starters 200 150 100 50 012345678910CTNT-NS+NS 1. 0-0-0-0 Cl 3. 30-0-20-15 Cl 5. 30-0-0-15 Cl 7. 30-30-0-0 Cl 9. 30-30-40-30 Cl 2. 30-0-0-0 Cl 4. 30-0-40-30 Cl 6. 30-0-0-30 Cl 8. 30-30-20-15-Cl 10. 30-30-40-0 Cl Tillage N-Serve CT = Chisel Till NT = No-Till Bu/A Figure 1. Corn yield as affected by starter fertilizers, tillage and nutrification inhibitor, Varsa and Ebelhar, Dixon Springs Agricultural Center, 1996.
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