Daryl Bowman

D.C. Erbach, D.E. Wilkins, and W.G. Lovely Agronomy Journal 65:

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

Emerson D. Hafziger, Paul R. Carter and E.E. Graham Crop Science 31:

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

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

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:

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

RESULTS GRAIN YIELDS DECREASED WITH INCREASED IN-ROW VARIABILITY

G. CARLSON, T. DOERGE, AND D. CLAY SITE-SPECIFIC MANAGEMENT GUIDELINES 37

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

R.L. NIELSEN DEPT. OF AGRONOMY,PURDUE AGRY-91-01

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

R.L. NIELSEN PURDUE

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

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

D. T. BOWMAN CROP SCI. 27:

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

THINNING RESULTED IN MORE UNIFORM STANDS MATURITYTREATMENTGRAIN YIELD% STANDSD EARLYTHIN ** NO THIN MEDIUMTHIN ** NO THIN LATETHIN **11.5** NO THIN

NO SIGNIFICANT ENTRY X TRT INTERACTION MATURITYDFMS EARLY error MEDIUM error LATE error

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

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