1 / 2

Example of variability in removal coefficients

Example of variability in removal coefficients. 9 sources researched 203 data entries States represented: KS (48) IA (100) IL (9) MN (10) NJ (10) DE (7) MA (4) MD (3) PA (5) N/A (7). 60. 50. 40. Frequency. 30. 20. 10. 0. 0.15. 0.20. 0.25. 0.30. 0.35. 0.40. 0.45. 0.50.

zephania-finch
Télécharger la présentation

Example of variability in removal coefficients

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Example of variability in removal coefficients • 9 sources researched • 203 data entries • States represented: • KS (48) • IA (100) • IL (9) • MN (10) • NJ (10) • DE (7) • MA (4) MD (3) • PA (5) N/A (7) 60 50 40 Frequency 30 20 10 0 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 Corn grain removal (lb P O /bu) 2 5

  2. References Heckman, J.R., J.T. Sims, D.B. Beegle, F.J. Coale, S.J. Herbert and T.W. Bruulsema. Phosphorus and potassium removal in corn. Better Crops 85(1):4-6. Karlen, D.L., R.L. Flannery, and E.J. Sadler. 1988. Aerial accumulation and partitioning of nutrients by corn. Agron. J. 80:232-242. Lockman, R.B. 1986. Statistics for high yield corn: Yield, soil test, plant analysis, and fertilizer rate data fro the Herman Warsaw farm 1980-85. Agrico Chemical Co., Washington C.H., OH. Mallarino, A.P. 1996. Evaluation of optimum and above-optimum phosphorus supplies for corn by analysis of plant parts. Agron. J. 88:376-380. Malzer, G.L., J. Orf, F. Bergsrud, J. Geadelmann, and T. Graff. 1982?. High corn and soybean yield experiments on the coarse textured, irrigated soils of Minnesota. Malzer, G.L. and R.D. Munson. 1979. Memo dated April 16, 1979 from Bob Munson to Werner Nelson. Data for Malzer's 202 bu/acre corn. Munson, R.D. 1986. Research data file, dated February 7, 1986. Reetz, H.F. and M. Sevey. 1986. Grain analysis on Herman Warsaw's 370 bu/A corn, field # 3 (South). Mike Sevey, IMC Lab in Terra Haute, ran the grain sample, Harold Reetz obtained the grain sample from Herman. Analyses faxed to Bob Munson, PPI, June 4, 1986. Schlegel, A.J. and J.L. Havlin. 1995. Corn response to long-term nitrogen and phosphorus fertilization. J. Prod. Agric. 8:181-185.

More Related