Avaliação da eficiência do uso de herbicidas no controlo de cyperus rotundus na cooperativa 25 de junho em Boane

Abstract

The present study responds to the concern shown by sper-Maputo in the control of sedge with the use of roundup. For this purpose, a trial was carried out in the cooperative 25 de Junho in Boane, Maputo province from May to September 2002 to evaluate the efficiency of the use of two herbicides in the control of nutsedge and to select the best one and including the determination of the highest doses. suitable for its control. The experiment used a randomized complete block design with eight treatments replicated three times. The herbicides used were roundup 36% sl and basagran 48% sc with 3 levels each. For roundup, doses of 5, 8 and 10 1/ha were used and for basagran doses of 4, 5 and 6 1/ha. The infestation was natural and uniform. To evaluate the effect of the herbicides, the height of the nutsedge plants, the ground cover, the infestation density before and after the application of the herbicide and the dry weight of the nutsedge were measured. The results were statistically analyzed in the sas program, and basagran was not efficient in controlling purple nutsedge, coinciding with the literature that indicates this herbicide as effective in controlling yellow nutsedge. The roundup had a significant effect on purple nutsedge. In the first 30 days there were no significant differences in the three doses applied and after 30 days, the doses of 8 1/ha and 10 1/ha were the most efficient, not differing statistically from each other. For all levels, maximum efficiency was reached at 30 dda. Regression analysis did not show linear dependence between roundup doses and green mass reduction