Nov 29, 2000 ... (00-NCC-1). Herbicide tank-mix combinations and application timings for weed
control in corn, Nashua, Iowa, 2000. Owen, Micheal D.K. ...
(00-NCC-1) Herbicide tank-mix combinations and application timings for weed control in corn, Nashua, Iowa, 2000. Owen, Micheal D.K., James F. Lux, Damian D. Franzenburg, and James M. Lee. The purpose of this study was to evaluate acetamide herbicides, Balance and Prowl followed by various ALS inhibitor herbicides applied at several postemergence timings for weed efficacy and corn phytotoxicity. The soil was a Floyd, Kenyon, Ostrander loam with a pH 6.85 and 3.5% organic matter. The experimental design was a randomized complete block with three replications and plots were 10 by 25 ft. The 1999 crop was soybean. Tillage included a spring field cultivation. Fertilization included 145 lb/A actual N applied as anhydrous ammonia. Preplant treatments were incorporated one pass with a field cultivator operating 3 to 4 inches deep. Crop residue on the soil surface was 25% at planting. “DeKalb hybrid 477” corn was planted 2 inches deep on May 2, at 32,454 seeds/A in 30 inch rows. May rainfall included: 0.01, 0.46, 0.26, 0.15, 0.21, 0.13, 0.53, 0.23, 0.01, 0.88, 0.30, 0.02, 0.17 and 0.64 inches on May 1, 8, 11, 12, 16, 17, 18, 21, 22, 26, 27, 28, 30 and 31, respectively. Total rainfall for May was 4.0 inches. June rainfall included: 0.12, 0.02, 0.43, 0.36, 0.03, 2.72, 0.03, 0.34, 0.05, 0.01, 0.45, 0.27, 0.17, 0.10, 0.01, and 0.50 inches on June 1, 3, 4, 10, 12, 13, 14, 15, 16, 19, 20, 23, 24, 25, 26, and 28, respectively. Total rainfall for June was 5.61 inches. July rainfall included: 2.56 inches and 0.54 inches from July 1 through 15 and 16 through 31, respectively. Rainfall total for August was 3.46 inches. Application information is listed below: Date May 2 Treatment PPI, PRE Sprayer gpa 20 psi 35 nozzle 11002 Temperature (C) air 26 soil (4 inch) 21 Soil moisture dry Wind (mph) 0-5 SE Sky clear Relative humidity (%) 25 Corn growth leaf no. height (inch) Giant foxtail leaf no. height (inch) 2 infestation (ft ) Common lambsquarters leaf no. height (inch) infestation (ft2) Common waterhemp leaf no. height (inch) 2 infestation (ft ) Pennsylvania smartweed leaf no. height (inch) infestation (ft2) -
May 10 SPIKE
May 17 EPOST
June 2 POST
June 11 LPOST
20 35 11003
20 35 11003
20 30 11003
20 30 11003
16 13 moist 5-10 S cloudy
16 16 wet 5-10 NE cloudy
26 19 wet 8-12 N clear
22 21 moist 0-2 W cloudy
62
93
56
73
-
2 1.5
V4 4-5
V5 10-11
1 0.25 0-3
1-1.5 0.25-1 25-50
1-4 0.25-3.5 0-20
1-4, 1-2 tillers 0.5-4 0-10
-
cotyl 0.25 0-1
2-6 0.25-2 0-1
numerous 0.5-3 0-1
-
cotyl 0.25 0-1
2-4 0.25-1 0-1
numerous 0.5-3 0-1
-
-
-
2-6 0.5-3 0-1
Velvetleaf leaf no. height (inch) infestation (ft2)
-
cotyl 0.25 0-1
cotyl 0.25 5-15
cotyl-2 0.25-2 0-5
cotyl-4 0.25-3 0-1
Herbicide treatments did not adversely affect corn populations when observed on May 30. Significant corn injury was observed on June 9, and 15 from SPIKE, EPOST, POST and LPOST treatments. Injury was still apparent on June 30 with many of these treatments, however, it was no longer considered serious. Excellent giant foxtail, velvetleaf, common waterhemp, common lambsquarters, and Pennsylvania smartweed control was achieved with all treatment combinations and application timings when observed on June 30 and July 19. (Dept. of Agronomy, Iowa State University, Ames)
TRIAL # US 068/00/01 000 A1 : NCC 1 DATA MEAN TITLE: Herbicide tank-mix combinations and application timings for weed control in corn. CREATED: 03/14/2000 REVISED: 11/29/2000 COMPLETED: N PROJECT TYPE: HERBICIDE LOCATION: NASHUA, IA RESEARCHED BY: IA State University DESIGN: RANDOMIZED COMPLETE BLOCK DESIGN PLOT SIZE: 10.00 FT WIDE X !"#$$%&'%LONG REPS: 03
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