Objetivo desse trabalho foi avaliar o desempenho da soja em nodulação e crescimento radicular sob diferentes níveis de dosagem em inoculação e coinoculação. Foi conduzido em Delineamento em blocos casualizados, em esquema fatorial 4x16. As dosagens utilizadas foram 50-100-150ml (25kg de semente) com Azospirillum brasilense e 450-900-1350ml por ha de Bradyrhizobium japonicum. Os resultados das análises da parte aérea e radicular das plantas foram comparados pelo teste de Tukey (significância de 5%). A inoculação com Bradyrhizobium japonicum apresentou resultados superiores em todos os aspectos avaliados quando comparadas a o tratamento zero, já a inoculação com Azospirillum brasilense não demonstrou resultados significativos em nenhum aspecto isoladamente. Com a co-inoculação mostrou que a interação das duas estirpes apresentou resultado superior, na matéria verde raiz e matéria seca parte aérea, significando um melhor desenvolvimento vegetativo da planta
The objective of this study was to evaluate the effect of 2,4-D and chlorimuron-ethylunderdosage on the soybean hormesis effect. The study was conducted in the facilities of the University Center of Vale do Araguaia (UNIVAR), in Barra do Garças, MatoGrosso. Was used or the randomized block design (DBC) with five replications for each treatment, where an experiment was performed for 2,4-D and another forchlorimuron ethyl. The treatments used were: 2,4-D (0, 5, 10, 15 and 20g ea ha-1) and Ethyl Chlorimuron (0.4, 0.8, 1.2 and 1.6 g eaha-1). The use of the lowest chlorimuron dose and the highest 2,4-D tested showed significant results for plant height, stem diameter, biomass accumulation and dry matter.
Resumo -A espécie Murdannia nudiflora pertence à família Commelinaceae é conhecida como "trapoerabinha". Devido à elevada capacidade competitiva e por apresentar tolerância ao glyphosate esta espécie se desenvolve e compete com a soja, apresenta rápido crescimento quando ocorre a senescência das folhas de soja e dificulta o manejo das plantas daninhas no cultivo subsequentes. O objetivo deste trabalho foi avaliar a eficiência de herbicidas isolados ou em associação em pós colheita da soja e verificar a dose do ingrediente ativo que proporciona o melhor controle de M. nudiflora. Abstract -The species of Murdannia nudiflora belongs to the family Commelinaceae is known as doveweed. Because of competitive capacity and tolerance to glyphosate this species growing during the soybean crop cycle, presenting rapid growth when the leaf senescence of soybean occurs difficulting weed management in others cultures. The objective of this study was to evaluate the efficiency of different active ingredients of herbicides in combination or separately, and verify the best dosage of the active ingredient, which provided the best control of M. nudiflora. Two field experiments were arranged in randomized block design. The first experiment consisted of eight herbicide treatments being glyphosate 972 g a.e. ha -1 , atrazine 1500 a.i. g ha -1 , carfentrazone 12 g 1 Recebido para publicação em
Soybeans are one of the most produced grains in the world, and because of the high cost of nitrogen fertilizers, new technologies in the inoculation of diazotrophic bacteria have been developed. The objective of this study was to evaluate the effect of Bradyrhizobium-based inoculant doses and Lipo-chito-oligosaccharide molecules (LCOs), together with bacterial protector as an additive, compared to a conventional inoculant in the inoculation of soybean seeds. The experiment was carried out in a greenhouse, with soil from a Red Oxissol of sandy texture. The experimental design was in randomized blocks with 3 replicates, the treatments being distributed in a 5 x 2 factorial scheme (2 inoculants and 5 inoculant doses). The seeds of the soybean cultivar M8866 were inoculated and seeded in the pots containing 11 L of substrate, where two plants remained for 45 days. Nine biometric-productive parameters were evaluated. Increasing the dose, regardless of the inoculant, provided an increase in root length and probably active nodules. In general, it was possible to observe statistical superiority of the inoculant with technologies integrated in relation to the conventional one, independent of the dose, when comparing the inoculants with respect to these two variables. Furthermore, the inoculant with integrated technologies provided a higher mass of fresh and dry matter of the nodules with the application of the highest inoculant dose (3.6 billion UFC mL-1). It was noted that increasing the dose of conventional inoculant did not cause the increase of fresh and dry matter mass of the nodules such as the inoculant with integrated technologies, suggesting the beneficial action of the bioprotectant and of the LCOs molecules.
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