Ues of quizalofop-p-tefuryl with CDA applicator in tillage and no-tillage soybean
1996
Pornchai Lueang-a-papong | Suthep Meeboon (Chiang Mai Univ., Chiang Mai (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Experiment was undertaken at the Department of Agronomy, Faculty of Agriculture, Chiang Mai University during November 1995 - April 1996. The objective of the study was to compare the use of postemergence herbicide quizalofop-p-tefuryl [(+)-terahydrofurfuryl(R)-2[4-(6-chloroquinoxalin-2-yloxy) phenoxy]propanoate] in different rates and applicators (Knapsack and CDA applicator) in tillage and no-tillage soybean. In no-tillage plot, glyphosate (N-(phosphonomethyl)glycine) was applied as preplating herbicide at the rate of 2.5 kg(ae)/ha 7 days before planting. Quizalofop-p-tefuryl at the rate of 60 and 90 g(ai)/ha was applied at 25 day after soybean planting with knapsack sprayer (flat fan nozzle; spray volume 375 l/ha) and CDA (spray volume 25 and 50 l/ha.) The results showed that quizalofop-p-tefuryl at the rate of 60-90 g(ai)/ha applied with CDA applicator could control annual grass weeds (Digitaria adscendens ; Echinochloa crus-galli : Eleusine indica, Dactyloctenium aegyptium) as effectively as that when applied with knapsack sprayer. Quizalofop-p-tefuryl showed the efficacy on annual grass weed control in both tillage and no-tillage soybean, but caused slight phytotoxicity in soybean during the first 21 days after application. The use of quizalofop-p-tefuryl for annual grass weed control produced significantly higher soybean yield over the non-treated plot. It was also found that, the crop growth and yield in no-tillage was not different from tillage soybean.
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