Weed Management in Conventional and Herbicide Resistant Soybean.

Transcription

1 Weed Management in onventional and Herbicide Resistant Soybean. --W OJTIV: SUMMRY: valuate herbicide programs in Roundup Ready, Liberty Link,, and conventional soybean for weed control, grain yield, and return over investment. Soybean injury ranged from to at T for treatments containing Flexstar. Preemergence applications of uthority or anopy XL caused to soybean injury at T. No soybean injury was observed at T. ll herbicide treatments controlled at least of ivyleaf morningglory, velvetleaf, and common cocklebur and at least of common ragweed. Giant foxtail control was or greater from all treatments that included a postemergence herbicide application. ll treatments controlled at least control of common waterhemp except Liberty alone, uthority followed by Synchrony plus ssure II, and Prowl followed by Synchrony. Soybean yield ranged from to bu/ in handweeded plots. Soybean yield was similar in all handweeded plots regardless of variety. ll varieties in each herbicide program yielded similar to the handweeded checks with the exception of the total of anopy XL plus Prowl and the followed by POST treatments of Prowl followed by Flexstar in the conventional variety. The reduced yield in these plots was likely due to the poor control of giant foxtail. High returns over investment were evident in the Roundup Ready and conventional varieties. The highest economic return was in the Roundup Ready variety in the total POST treatment. HRIIS WS ROP SSUR II. UTHORITY NOPY XL. FLXSTR.... ROUNUP ULTR SL SYNHRONY OKLUR, OMMON FOXTIL, GINT MORNINGGLORY, IVYLF RGW, OMMON VLVTLF WTRHMP, OMMON SOYN ryan Young and Scott Notle PLNT, SOIL N GNRL GRIULTUR PRTMNT SOUTHRN ILLINOIS UNIVRSITY

2 Weed Management in onventional and Herbicide Resistant Soybean. Project ode: --W Location: elleville Research enter Investigator: ryan Young, ssistant Professor, Southern Illinois University Weed ode ommon Name Scientific Name. STF FOXTIL, GINT STRI FRI HRRM.. ML RGW, OMMON MROSI RTMISIIFOLI L.. UTH VLVTLF UTILON THOPHRSTI MIK.. XNST OKLUR, OMMON XNTHIUM STRUMRIUM L. SSP. STRUMRIUM. MT WTRHMP, OMMON MRNTHUS RUIS SUR. IPOH MORNINGGLORY, IVYLF IPOMO HR (L.) JQ. rop : GLXM SOYN Variety: S NOT Planting Method: S Planting ate: May-- Rate: L/ epth:. IN Row Spacing: IN Plot Width, Unit: FT Plot Length, Unit: FT Reps: Tillage Type: RU-TILL Study esign: SPLIT-PLOT Previous rop, Year: GLXM, Fertilizer applied: N L/, P O L/, K O L/ Soil Name: WIR OM:. ph:. : Texture: SILT LOM P : L/, K: L/ PPLITION SRIPTION pplication ate: May-- Jun-- Jun-- Jun-- Jun-- Time of ay: : : : : : pplication Method: SPRY SPRY SPRY SPRY SPRY pplication Timing: -"W- -"RG pplic. Placement: ROSOI ROFOL ROFOL ROFOL ROFOL ir Temp., Unit: F F F F F Relative Humidity: Wind Velocity, Unit: MPH - MPH - MPH - MPH - MPH Soil Moisture: RY NORML NORML RY WT loud over: ROP STG T H PPLITION rop ode, Stage: N GLXM V GLXM V GLXM V GLXM V Height, Unit: N - IN - IN - IN - IN W STG T H PPLITION Weed ode: STF STF STF STF Stage(leaves): Height(inches): ensity: HIGH HIGH MIUM LOW Weed ode: ML ML ML Stage(leaves): Height(inches): ensity: HIGH MIUM MIUM Weed ode: UTH UTH UTH Stage(leaves): Height(inches): ensity: LOW LOW LOW Weed ode: XNST XNST XNST Stage(leaves): Height(inches): ensity: LOW MIUM LOW Weed ode: MT MT MT Stage(leaves): Height(inches): ensity: MIUM MIUM MIUM Weed ode: IPOH IPOH IPOH Stage(leaves): - - OTL- Height(inches): ensity: MIUM MIUM LOW PPLITION QUIPMNT ppl. quipment: O SPRY O SPRY O SPRYR O SPRYR O SPRYR Operating Pressure: PSI PSI PSI PSI PSI Nozzle Type: FLT FN FLT FN FLT FN FLT FN FLT FN Nozzle Size: oom Length, Unit:. FT. FT. FT. FT. FT Spray Volume, Unit: GP GP GP GP GP NOTS: SOYN VRITIS R G RR, G, G, N G LL, S TRTMNT LIST. Harvested Oct--, () inch rows by ft.

3 TL. W MNGMNT IN ONVNTIONL N HRII RSISTNT SOYN. PROJT O:--W TRTMNT ONVNTIONL NONTRT ONVNTIONL HNW ONVNTIONL NOPY XL ->UTHORITY ->LSSI ONVNTIONL FLXSTR UN ONVNTIONL UTHORITY FLXSTR UN ONVNTIONL FLXSTR UN NONTRT HNW FORM RT UNIT PRO RT. OZ/. PT/. PT/. OZ/... OZ/. PT/. OZ/... PT/. PT/.. PPL TIM PPL O YIL U/ RTURN $/ -"W- GLXM INJURY, T T P PLNTS / STF T P ONTROL ML T P NOPY XL ->UTHORITY ->LSSI MS UTHORITY MS MS MS ROUNUP RY NONTRT ROUNUP RY HNW RY RY RY RY OZ/ PT/ OZ/ L/ GL OZ/ OZ/ L/ GL OZ/ L/ GL OZ/ L/ GL -"W- -"W- -"RG -"RG (ONTINU)

4 TL. W MNGMNT IN ONVNTIONL N HRII RSISTNT SOYN. PROJT O:--W (ONTINU) TRTMNT ROUNUP RY NOPY XL ->UTHORITY ->LSSI ROUNUP RY ROUNUP ULTR MS ROUNUP RY UTHORITY ROUNUP ULTR MS ROUNUP RY ROUNUP ULTR MS ROUNUP ULTR MS NONTRT HNW NOPY XL ->UTHORITY ->LSSI SYNHRONY SSUR II PRIM OIL O UN UTHORITY SYNHRONY SSUR II PRIM OIL O UN SYNHRONY PRIM OIL O UN FORM. RT.. SL RY SL RY SL RY SL RY UNIT L / L / L / L / PRO RT. OZ/. PT/. QT/. L/ GL. OZ/. QT/. L/ GL. QT/. L/ GL. QT/. L/ GL. OZ/. PT/. OZ/. OZ/... OZ/. OZ/. OZ/... PT/. OZ/.. PPL TIM -"W- -"W- -"RG -"RG PPL O YIL U/ RTURN $/ -"W- GLXM INJURY, T T P PLNTS / STF T P ONTROL ML T P LS P (ONTINU)

5 TL. W MNGMNT IN ONVNTIONL N HRII RSISTNT SOYN. PROJT O:--W (ONTINU) MT P IPOSS P T ONTROL UTH XNST PPL PPL T T T TRTMNT FORM. RT UNIT PRO RT TIM O P P ONVNTIONL NONTRT ONVNTIONL HNW ONVNTIONL NOPY XL ->UTHORITY ->LSSI ONVNTIONL FLXSTR UN ONVNTIONL UTHORITY FLXSTR UN ONVNTIONL FLXSTR UN NONTRT HNW OZ/. PT/ PT/ OZ/ OZ/ PT/ OZ/ PT/ PT/ NOPY XL ->UTHORITY ->LSSI MS UTHORITY MS MS MS OZ/. PT/.... RY.... OZ/ L/ GL RY OZ/ OZ/ L/ GL RY RY OZ/ L/ GL OZ/ L/ GL -"W- -"W- -"RG -"RG ROUNUP RY NONTRT ROUNUP RY HNW (ONTINU)

6 TL. W MNGMNT IN ONVNTIONL N HRII RSISTNT SOYN. PROJT O:--W (ONTINU) ONTROL UTH XNST MT PPL PPL T T T TRTMNT FORM. RT UNIT PRO RT TIM O P P P ROUNUP RY NOPY XL. ->UTHORITY ->LSSI. ROUNUP RY ROUNUP ULTR MS ROUNUP RY UTHORITY ROUNUP ULTR MS SL RY SL RY. OZ/.... PT/. L /. QT/.. L/ GL.. L /.. OZ/. QT/. L/ GL ROUNUP RY ROUNUP ULTR SL. L /. QT/ -"W- MS RY.. L/ GL -"W- ROUNUP ULTR SL. L /. QT/ -"RG MS RY.. L/ GL -"RG NONTRT HNW NOPY XL.. OZ/ ->UTHORITY. ->LSSI.... PT/ SYNHRONY SSUR II PRIM OIL O UN UTHORITY SYNHRONY SSUR II PRIM OIL O UN SYNHRONY PRIM OIL O UN LS P.. OZ/... OZ/ OZ/.. OZ/... OZ/ PT/.. OZ/ IPOSS T P..... PROTOOL: SIU/SN.. T = YS FTR FINL PPLITION. P = YS FTR PLNTING. = N OF SSON RTING.. RTING TS: YS FTR -"W- WS ON JUN--. YS FTR,,, N -"RG PPLITIONS ON MY--, JUN--, JUN--, N JUL--, RSPTIVLY. YS FTR,,, N -"RG PPLITIONS ON JUN--, JUL--, JUL--, N JUL--, RSPTIVLY.