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Fluid Journal : Fluid Journal 1993-1995
3 Fluid Journal Fall 1993 very high for both P and K. Starter used was 7-21-7, which delivers a lbs/A rate of 8+23+8 (N+P2O5+K2O). Don't overlook hybrids Recent Florida11 research on irrigated corn demonstrated large differences in the responsiveness of hybrids to starter fertilizers containing 40 lbs/A P2O5 as ammonium polyphosphate. In a three- year study of 21 hybrids, eight responded positively all three years, while responses of others varied by year. Range in average response was from 29 bu/A for a hybrid that responded positively each year to 14 bu/ A for a hybrid that responded negatively each year. Additional greenhouse research revealed that hybrids that did not benefit from starter fertilization produced greater root mass than those that did. Dr. Fixen is North Central director for the Potash & Phosphate Institute, Brookings, SD and Dr. Lohry is agronomist for Nutra-Flo Company in Sioux City, Iowa. ! References 1. Fixen, P.E. and B.G. Farber. 1987. Effects of starter fertilization of corn under varying cultural and environmental conditions, 1987. Soil PR 87-2, South Dakota State University. 2. Fixen, P.E., B.G. Farber, and M. Vivekanandan. 1987. Phosphorus management as influenced by tillage systems in eastern South Dakota, 1984- 1986. In 1987 Research Symposium Proceedings. Fluid Fertilizer Foundation, St. Louis, MO. pp 201 -212. 3. Francis, D.D., J.W. Doran, and R.D. Lohry. 1993. Immobilization and crop uptake of ammonium & nitrate nitrogen applied to corn as starter fertilizer. Commun. in Soil Sci. Plant Anal. 24: In press. Figure 1. Influence of tillage system on corn response to starter fertilizer in southern Minnesota (Randall and Swan, 1990). 12 10 8 6 4 2 0 100 75 50 25 0 Fall Plow Fall Chisel Spring Disk Ridge Plant No Illage Twice Yield Increase Bushels per Acre Residue Cover % Yield Increase Bushels per Acre Residue Cover % 4. Mengel, D.B. 1990. Fertilizing corn grown using conservation tillage. Agronomy Guide 268. Purdue Univ. W. Lafayette, IN. 5. Moncrief, J.F., S.D. Grosland, and J.J. Kuznia. 1991. Tillage effects on corn growth, stand establishment, & yield, Isanti county, MN. In A Report on Field Research in Soils, Misc. Pub. 71-1991. Univ. of Minnesota, St. Paul, pp 313-316. 6. Randall, G.W., & J.B. Swan. 1990. Conservation tillage for corn & soybean production. In University of Minnesota Southern Experiment Station Research Report, Waseca. pp 107-110. 7. Rehm, G., and C. Shapiro. 1991. Field evaluation to determine best fluid starter fertilizer ratios for corn. Progress report. 8. Rehm, G., G. Cremers, and A. Scobbie. 1989. Field evaluation to determine best fluid starter fertilizer ratios for corn. A report on field research in soils, Misc. Pub. 62-1990. Univ. of Minnesota, St. Paul, pp 181-187. 9. Rehm, G.W., RA. Wiese, and E.J. Penas. 1991. Field evaluation to determine best fluid starter fertilizer ratios for corn. In 1991 Research Symposium Proceedings. Fluid Fertilizer Foundation, St. Louis, MO. pp 271-283. 10. Rehm, G.W., S.D. Evans, W.W. Nelson and G.W. Randall. 1988. Influence of placement of phosphorus & potassium on yield of corn and soybeans. J. Fert. Issues 5:6-13. 11. Teare, I.D. and D.L. Wright. 1990.Corn hybrid-starter fertilizer interaction for yield & lodging. Crop Science 30: 1298-1303. 12. Touchton, J.T. 1988. Starter fertilizer combinations for corn grown on soil high in residual P. J. Fert. Issues 5: 126-130. 13. Wiese, R.A. and E.J. Penas. 1989. Field evaluation to determine best fluid starter fertilizer ratios for corn. Soil Sci. Res. Report, Dep. of Agronomy, Univ. of Neb., Lincoln. pp 62-67. 14. Zublena, J. 1991. Nitrogen and phosphorus rates for starter fertilizers. In Proceedings of the Starter Fertilizer for Crops in the Southeast Conference. PPI/ FAR Tech. Bulletin 1991-1, Potash & Phosphate Institute, Atlanta, GA.pp 12-13.
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