Weeds interfere dramatically in the productive potential of cassava; however, information regarding herbicides that are selective to crops is still scarce. Thus, the aim in this study was to assess the initial growth of IAC 90 cassava plants after the application of sulfentrazone at different stages of germination of cassava in clayey and sandy soils. Three experiments were simultaneously deployed: the first experiment consisted in the application of sulfentrazone in the non-germinated stage of cassava cuttings; the second one in the stage of germinated cassavas cuttings (0.9 cm shoots); and the third one in applications in the stage of cassava cuttings with buds emerging (6.5 cm shoots and emerging from the soil). For each experiment the experimental design in randomized blocks was used in the 2 x 5 factorial arrangement with four replications. The factors were composed of two soils (sandy and clayey) and five doses of sulfentrazone (0, 250, 500, 750 and 1,000 g ha-1). It was found that depending on the herbicide dose, development stage of the buds of cassava cuttings and the type of soil, damage can occur in the initial development of the IAC 90 cassava plants. The greatest potential of sulfentrazone selectivity has occurred in applications in the non-germinated cassava cuttings stage and in doses lower than 500 g ha-1 in the clayey soil.
展开▼
机译:杂草极大地干扰了木薯的生产潜力;但是,关于对作物具有选择性的除草剂的信息仍然很少。因此,本研究的目的是评估在土质和沙质土壤中木薯发芽的不同阶段施用次磺tra酮后IAC 90木薯植物的初始生长。同时进行了三个实验:第一个实验是在木薯cutting插的未发芽阶段施用次en。发芽的木薯cutting插阶段的第二个(0.9 cm芽);在木薯s插阶段出现芽(6.5厘米芽并从土壤中涌出)的应用中排名第三。对于每个实验,以2 x 5析因排列并四次重复使用随机区组中的实验设计。这些因素由两种土壤(桑迪和黏土)和五剂次磺zone(0、250、500、750和1,000 g ha-1)组成。已经发现,取决于除草剂的剂量,木薯插条的芽的发育阶段和土壤类型,在IAC 90木薯植物的初始发育中可能会发生损害。次生zone区选择性的最大潜力出现在未发芽的木薯插条阶段,在黏性土壤中的剂量低于500 g ha-1。
展开▼