Full TGIF Record # 11664
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Norris, B. E. Jr.; Walker, R. H.; Harris, J. R.
Author Affiliation:Agronomy and Soils Dept., Alabama Agric. Exper. Station, Auburn University, Auburn University, AL.
Title:Weed Management Systems for the Control of Annual Grasses in Minimum Tillage Grain Sorghum
Meeting Info.:Held: January 14-16, 1985, Houston, TX.
Source:Proceedings of the 38th Southern Weed Science Society. Vol. 38, 1985, p. 11.
Publishing Information:Southern Weed Science Society
Keywords:TIC Keywords: Weed control; Panicum; Digitaria sanguinalis; Alachlor; Atrazine; Paraquat; Tridiphane; Cyanazine; Herbicide rates
Abstract/Contents:"Two studies were initiated in 1984 at the Wiregrass Substation, Headland, Alabama to determine the effects of various herbicide systems and row patterns for the control of Texas panicum (Panicum texanum Buckl.) (Expt. 1) and large crabgrass [Digitaria sanguinalis (L.) Scop.] (Expt. 2) in minimum tillage grain sorghum [Sorghum bicolor (L.) Moench.]. Several minimum tilled treatments were compared to a conventional tilled treatment that included a standard herbicide system to evaluate their effectiveness for the control of these annual grasses. The standard herbicide system for conventional tillage was comprised of alachlor (2.8 kg ai/ha) preplant incorporated (PPI), atrazine (1.7 kg/ha) postemergence over-the-top (POT) and paraquat (0.28 kg/ha) post-emergence directed (PDS). The minimum tilled treatments included alachlor (PPI) alone or in combination with atrazine (POT) and paraquat (PDS), tridiphane (0.56 kg/ha) plus atrazine (POT) or tridiphane plus cyanazine (1.7 kg/ha) (POT). Also a treatment of no alachlor, tridiphane plus atrazine (POT) and paraquat (PDS) was included. Row patterns consisted of single 76-cm or twin 23-cm rows centered on a 76-cm spacing. Flurazole treated 'Pioneer B815' grain sorghum seed were planted at a constant rate of 5.6 kg/ha for both row patterns. All plots were four rows by 7 m. The experimental design was a randomized complete block with four replications of eacht reatment in a factorial arrangement. Means were separated using a least significant difference at the 5% level of probability. Full season control (116 days after planting) of Texas panicum and large crabgrass was excellent with the conventional system of alachlor, atrazine and paraquat. The minimum tilled system that was equivalent to the conventional for annual grass control was tridiphane plus atrazine and paraquat. No other system provided acceptable control of Texas panicum. However, the minimum tilled systems of alachlor, atrazine and paraquat or alachor, tridiphane plus cyanazine provided acceptable control (> 80%) of large crabgrass. No difference in annual grass control was detected between the two row patterns. There was no difference among yields of the twin 23 cm rows for any of the minimum tilled systems in the Texas panicum study when compared to the conventional system. The minimum tilled systems of alachlor alone or in combination with tridiphane plus cyanazine differed significantly from the conventional system when yields of the single 76-cm rows were examined. In the large crabgrass study, yields for both row patterns of the minimum tilled system consisting of alachlor alone were significantly less than that of the conventional system."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Norris, B. E. Jr., R. H. Walker, and J. R. Harris. 1985. Weed Management Systems for the Control of Annual Grasses in Minimum Tillage Grain Sorghum. Proc. Meet. South. Weed Sci. Soc. 38:p. 11.
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