Efficacy of Oxyfluorfen Herbicide for Weed Control In Broccoli ( Brassica oleracea L. var. italica )

摘要

Background and Objective: Increased demand for fresh market head broccoli (Brassica oleracea L. var. italica) has led increased production in area Batu, Indonesia. Weeds are a major problem in broccoli cultivation. There are still limited information to prevent the yield loss caused by weeds, therefore the herbicide application in broccoli growth were researched. The objective of this study was to determine the effect of several weed control managements to obtain the most effective and efficient weed control in broccoli. Methodology: The research was conducted in Temas Village, Batu Sub-District, East Java (900 m a.s.l) during rainy season, since February until May 2016. This study established using Randomized Block Design consisting of seven treatments with four replications and comprised seven methods of weed control viz: Wy (weedy), Wf (weed free), W15 (weeding at 15 DAT), W15 +30 (weeding at 15 and 30 DAT), O1 + W15 (oxyfluorfen 240 g a.i ha–1 + weeding at 15 DAT), O1.5 (oxyfluorfen 360 g a.i ha–1) and O2 (oxyfluorfen 480 g a.i ha–1). Data obtained were subjected to an one-way analysis of variance (ANOVA) at 0.05 level, if there is a significance difference will be continued by Fisher’s Least Significant Differences (LSD) test at the 0.05 probability level. Results: The results of this study showed that treatment methods of weed controls on were significant difference (LSD0.05) between weed dry weight and the growth parameters of broccoli such as: plant height, leaf area, fresh weight of head, head diameter, fresh plant weight and yield (t ha–1). Based on Sum Dominance Ratio (SDR) analysis, the dominant weeds found were Eleusine indica and Portulaca oleracea (grasses). The Weed Control Effeciency (WCE) indicated that O2 treatment (oxyfluorfen 480 g a.i ha–1) was effective and efficient in controlling weeds such as Portulaca oleracea and Amaranthus blitum in the broccoli. Conclusion: The oxyfluorfen 480 g a.i ha–1 as a recommended treatment, this treatment significantly reduced (LSD0.05) weed dry weight 92.36% until 56 DAT and was not caused injury to the broccoli. By using this treatment, could produce 15.18 t ha–1 of broccoli head and no significant different from Wf (weed free) treatment.