HERBOLOGIA - anubih

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V.D. Mircov et al. Table 1. Prostrate pigweed, kochia, and Russian thistle control, and potato yields, averaged over three years (2002–2004). Treatments Timing Rate Weed control a Marketable b AMABL KCHSC SASKR potato yield l/ha –1 % t/ha –1 Trifluralin+metolachlor PPI 0.75+1.5 100 89 95 40.6 Trifluralin+EPTC PPI 0.75+3.0 100 88 95 40.9 Trifluralin+EPTC+metribuzin PPI 0.75+3.0+0.25 100 100 100 42.5 Fluorochloridone PRE 0.25 100 100 90 42.0 Fluorochloridone PRE 0.50 100 100 99 38.5 Pendimethalin PRE 1.0 100 99 69 28.9 Pendimethalin+EPTC PRE 1.0+3.0 100 100 70 33.8 Pendimethalin+metribuzin PRE 1.0+0.25 100 100 95 44.5 Metolachlor+ metribuzin PRE 2.0+0.25 100 100 96 43.3 Metribuzin PRE 0.5 100 100 100 45.4 Weed – free control 100 100 100 43.2 Unweeded control 0 0 0 28.7 Lsd (0.05) 1 5 6 30 a AMABL–prostrate pigweed; KCHSC–kochia; SASKR–Russian thistle; b Tubers 28/55 in diameter; Combining pendimethalin and metribuzin did not significantly change marketable tuber yield as compared with metribuzin alone or the weed–free control in these experiments. Though fluorochloridone at 0.5 l/ha controlled all weeds in this study, marketable tuber yields from this treatment were lower than the weed–free control. The early injury appeared to have a deleterious effect on the crop, at least at the higher rate. Controlling prostrate pigweed, kochia, and Russian thistle at the beginning of the season increased marketable potato yields more than 100% compared with the unweeded control. Yields were greatest where weeds were controlled with no injury to the crop. All herbicide treatments in this research with the best broadleaf weed control and no crop injury contained metribuzin. Conclusions Study results emphasize the need for good weed control for optimum potato yields. Metribuzin applied alone or in combination with metolachlor, pendimethalin, or trifluralin plus EPTC gave excellent broadleaf weed control and the highest marketable potato yields. 6
Results of weed control in field potatoes References NELSON, D. C. AND J. F. GILES. (1989): Weed management in two potato (Solanum tuberosum) cultivars using tillage and pendimethalin. Weed Sci. 37:228–232. NELSON, D. C. AND M. C. THORESON. (1981): Competition between potatoes (Solanum tuberosum) and weeds. Weed Sci. 29:672–677. THAKRAL, K. K., M. L. PANDITA, S. C. KHURANA, AND G. KALLOO (1989): Effect of time of weed removal on growth and yield of potato. Weed Res. 29:33–38. VANGESSEL, M. J. AND K. A. RENNER (1990): Redroot pigweed (Amaranthus retroflexus) and barnyardgrass (Echinochloa crus–galli) interference in potatoes (Solanum tuberosum). Weed Sci. 38:338–343. WALL, D. A. AND G. H. FRIESEN. (1990a): Effect of duration of green foxtail (Setaria viridis) competition on potato (Solanum tuberosum) yield. Weed Technol. 4:539–542. ROSALES – ROBLES, E., J. M. CHANDLER, S. A., SENSEMAN, AND E. P. PROSTKO (1999): Influence of growth stage and herbicide on post – emergence johnsongrass (Sorghum halepense L.) control. Weed Tech. 13: 525 – 529. BAZIRAMAKENGA, R., AND G. D. LEROUX (1998): Economic and interference threshold densities and quackgrass (Elytrigia repens L.) in potato (Solanum tuberosum L.). Weed Sci., 46: 176–180. 7
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