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EFFECT OF CORN PLANT SPACING ON OVT RESULTS

EFFECT OF CORN PLANT SPACING ON OVT RESULTS. Daryl Bowman. RELATIONSHIPS BETWEEN FURROW OPENER, CORN PLANT SPACING, AND YIELD. D.C. Erbach , D.E. Wilkins, and W.G. Lovely Agronomy Journal 65:702-704. FINDINGS. LOOKING AT IMPROVING YIELD BY IMPROVING PLANT SPACING UNIFORMITY

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EFFECT OF CORN PLANT SPACING ON OVT RESULTS

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  1. EFFECT OF CORN PLANT SPACING ON OVT RESULTS Daryl Bowman

  2. RELATIONSHIPS BETWEEN FURROW OPENER, CORN PLANT SPACING, AND YIELD D.C. Erbach, D.E. Wilkins, and W.G. Lovely Agronomy Journal 65:702-704

  3. FINDINGS • LOOKING AT IMPROVING YIELD BY IMPROVING PLANT SPACING UNIFORMITY • ON A FIELD SCALE, WITH CORN PLANTED ON 38” ROWS, IMPROVING INTRA-ROW PLANT SPACING MAY NOT SIGNIFICANTLY IMPROVE TOTAL YIELD

  4. RESPONSE OF CORN TO UNEVEN EMERGENCE Emerson D. Hafziger, Paul R. Carter and E.E. Graham Crop Science 31:811-815

  5. MATERIALS AND METHODS • 7 ENVIRONMENTS • ILLINOIS AND WISCONSIN • TWO HYBRIDS • HAND PLANTED AT 3 DIFFERENT TIMES TO SIMULATE UNEVEN EMERGENCE

  6. RESULTS • LATE-EMERGING PLANTS DID NOT CAUSE YIELD LOSS COMPARED TO INCOMPLETE STANDS • UNEVEN EMERGENCE DID CAUSE YIELD LOSS • NO BENEFIT IN REPLANTING UNLESS LESS THAN HALF STAND

  7. INFLUENCE OF WITHIN-ROW VARIABILITY IN PLANT SPACING ON CORN GRAIN YIELD J.M. KRALL, H.A.ESECHIE, R.J. RANEY, S. CLARK, G. TENEYCK, M. LUNDQUIST, N.E. HUMBURG, L.S. AXTHELM, A.D.DAYTON, AND R.L. VANDERLIP. AGRONOMY JOURNAL 69:797-799

  8. MATERIALS AND METHODS • 4 YEARS • 3 IRRIGATED LOCATIONS • MEASURED WITHIN-ROW VARIABILITY AND CALCULATED SD

  9. RESULTS • GRAIN YIELDS DECREASED WITH INCREASED IN-ROW VARIABILITY

  10. ESTIMATING CORN YIELD LOSSES FROM UNEVENLY SPACED PLANTING G. CARLSON, T. DOERGE, AND D. CLAY SITE-SPECIFIC MANAGEMENT GUIDELINES 37

  11. CONCLUSIONS • EXPECT A SD OF 2 INCHES AS THE BEST THAT A CORN FARMER CAN ACHIEVE • YIELDS CAN BE EXPECTED TO GO DOWN WITH SD ABOVE 2.0 INCHES

  12. STAND ESTABLISHMENT VARIABILITY IN CORN R.L. NIELSEN DEPT. OF AGRONOMY,PURDUE AGRY-91-01

  13. CONCLUSIONS • A SD OF 2 INCHES IS ABOUT THE BEST ONE CAN EXPECT

  14. EFFECT OF PLANT SPACING VARIABILITY ON CORN GRAIN YIELD R.L. NIELSEN PURDUE

  15. MATERIALS AND METHODS • TWO CORN HYBRIDS • ONE FLEX EAR HYBRID • ONE FIXED EAR HYBRID • ONE YEAR • 5 LOCATIONS • 5 PLANT SPACINGS GIVING VARYING UNIFORMITY

  16. RESULTS • HYBRID X VARIABILITY INTERACTION AT 3 OF 5 LOCATIONS • NO CONSISTENT HYBRID DIFFERENCE WHERE INTERACTIONS OCCURRED • UNEVEN PLANT SPACING DID NOT FAVOR ONE HYBRID OVER THE OTHER CONSISTENTLY

  17. FEASIBILITY STUDIES ON PLANTING CORN TRIALS TO A STAND D. T. BOWMAN CROP SCI. 27:1231-1234

  18. MATERIALS AND METHODS • 10 RANDOM HYBRIDS IN 3 MATURITIES • 7 ENVIRONMENTS • THINNED TO A STAND VERSUS PLANTING TO A STAND AT 110%

  19. THINNING RESULTED IN MORE UNIFORM STANDS

  20. NO SIGNIFICANT ENTRY X TRT INTERACTION

  21. CONCLUSIONS • THINNING RESULTED IN A MORE UNIFORM STAND • THIS DID NOT RESULT IN A HYBRID X TREATMENT INTERACTION • I.E. THE BEST HYBRIDS WERE ALWAYS ON TOP AND THE DOGS WERE ALWAYS ON THE BOTTOM

  22. MY CONCLUSIONS • NO ONE HAS SHOWN A CONSISTENT HYBRID X SPACING INTERACTION • ALL ENTRIES ARE TREATED THE SAME IN OVTs • SURE PERFECT SPACING MAY INCREASE YIELDS BUT NO ONE HAS SHOWED VARIABLE PLANT SPACING AFFECTS RELATIVE CORN PERFORMANCE

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