E34—Lancaster Farming, Saturday, January 9,1982 Volunteer corn WASHINGTON, D.C. - Heavy populations of volunteer corn reduced soybean yields by as much as 83 percent, but were controlled by herbicides in tests reported by Robert N. Andersen, Agricultural Research Service weed scientist Andersen, Working with University of Minnesota resear chers J. Harlan Ford and William E. Lueschen, planted corn in clumps of 10 kernels each at three spacing rates: 2,4, and 8 feet apart in Hodgson soybeans planted in 30- or 40-inch rows. “We used clumps because they are more typical' of naturally occurring volunteer corn populations. Our infestation levels were high, but such levels can occur m patches in farm fields,” Andersen says. The 2-foot com spacings cut yields 83 pei'cent; the 4-foot spacings, 58 percent; and the 8-foot spacings, 31 percent. These are averages of 2-year tests at University of Minnesota ex perimental plots at Rosemont, Waseca, and Lamberton. The average loss of soybeans per ALSO SEE US FOR ALL HOME IMPROVEMENT NEEDS • ROOFING • SPOUTING • STORM DOORS & WINDOWS GUARANTEE ON LABOR & MATERIALS • WE OFFER FREE ENERGY SURVEY -CALLUS NOW LANTZ INSULATION 69 Strasburg Pike, Lane. PA 717-393-7274 Broadcasting Live from the Farm Show! 88 80 92 94 98 98 180 182 104 106 Daily 11 a.m. to 4 p.m. Live Interviews - Recorded Music- Farm Show News Co-Sponsored by; Leonard Martin Generator Systems Inc., Lebanon, PA Penn-Jersey Harvestore Inc., New Holland, PA Area John Deere Dealers (Robert E. Little, Zieglerville; I.G. Sales, Silverdaie; Kermit K. Kistler, Lynnport: Pikeviile Equip. Inc., Oley) Moyer's Chicks Inc., Quakertown, PA C.J. Wonsidler Bros. Inc., Allis Chalmers Farm Equip ment - Quakertown, New Tripoli, Oley McDonnell’s Dairy Farm, East Greenville, PA P.L. Rohrer & Bro., Smoketown, PA Terre Hill Silo Co., Terre Hill, PA Hollinger’s Farm Market, Ephrata, PA Allen G. Musser Inc., Bowmansvilie, PA Kubota Tractor Corporation Look For Our Booth In The Main Exhibition Hall yield by 83 clump of volunteer corn on the plots with the lightest rate, 1 clump per 8 feet, with 0.32 pound. "In other words, every 180 clumps of volunteer corn per acre will reduce the yield about 1 bushel”, Andersen says. This estimate would include only the direct reduction in seed production, he adds. There would be additional losses due to har vesting problems caused by the com. The researchers were also comparing the two herbicides currently available for volunteer corn control; diclofop (Hoelon) for earfy postemergence spray ap plication, and glyphosate (Roundup) applied with selective applicators such as ropewick system, which permits herbicide contact only with com that is taller than the soybeans. Two applications of glyphosate were made in all but one test, and the plots were cultivated and hand weeded to remove' all weeds other than com. Andersen found that diclofop was more effective in increasing INSULATE NOW WITH WOOD FIBER INSULATION and ADD SAVINGS TO VOUR ACCOUNT Ip v cuts soybean percent soybean yields than giyphosate at the higher corn densities. This was probably because the diclofop spray application could be made an average of 19 days ealier than the rope-wick applied giyphosate, allowing the corn less time to compete with the beans, Andersen says. Rope-wick applications had to wait for the com to grow above the soybeans. Andersen suggests early overtop application of diclofop for heavy infestations, it may be cheaper to use giyphosate applied when a selective applicator such as arope wick unit. o 108 107.5 RIM LANCASTER FARMING . FOR COMPLETE AND UP-TO-DATE MARKET REPORTS JIMMERMAN MANUFACTURING CORP. Products of Zimmerman Manufacturing Are: WAGON GEARS » Vtf 111 J '*ii f‘ev not to* 3dif“s an* Ur »Vn PORTABLE ELEVATORS opi ;ing through a soybean canopy, “volunteer corn”—a common problem in corn-soybean rotations—stunts soybeans’ growth and hinders harvest. HOLLANDER RD. RD3 NEW- HOLLAND,. PA 17557 717-354-9611 • MANURE HANDLING SYSTEMS • UTILITY TRAILERS AR- O MATIC VENTILATION SYSTEMS SADDLE UP! To Better Equipment... . „ Find It Ip ; Loncaster Farming's CLASSIFIEDS! KERO-SUN CENTER Money Talks, Nobody iNalksf^ BOWMANS STOVE SHOP INC. Follow Signs from Light at Hinkletown on Rt. 322 717-733-4973 R.D. 3 Napierville Ref., Ephrata, Pa. Tues., Wed., Sat. 9-5 Thurs., Fri. 9-9 Closed Monday Financing Available