Bidens pilosa L. is a weed that directly interferes with the potential of crops, competing for water, light and nutrients, reducing quality and productivity. The adoption of management practices aims to position the crop in a competitive and advantageous situation in relation to weeds, which is an alternative to eliminate the use of herbicides. For this reason, several studies use straw on the surface of the soil, as well as efficiency in depth in the deposition of seeds, as these factors directly influence the physiology of weeds, and contribute to the maximum yield of the crops. Therefore, the present study aimed to evaluate the no-tillage system using B. pilosa at different sowing depths and the influence on the physiological quality. The experiment was conducted in a greenhouse belonging to the Pontifical Catholic University of Paraná, Campus Toledo-PR. Sowing was performed manually with 50 seeds per vase with a capacity of 5 liters, containing soil, sand and organic matter in a 2:1:1 ratio. The straws were collected in commercial crops and dried in a forced circulation oven at 62 °C for 96 hours, using 3 t ha-1 for wheat, 6 t ha-1 for corn, considering the area of the pots and arranged superficially. For seven days, the germination test (G) was performed. On the 24 th day after implantation of the experiment, emergence (E), the total length of the seedlings (TLS) and the dry mass (DM) of the seedlings were performed. The design was in randomized blocks, with a 3x4 factorial, with three types of cover (without straw, corn straw and wheat straw) and four sowing depths (0, 2, 4 and 6 cm) and four replications. The results were submitted to analysis of variance and when significant. For the non-significant interaction, the qualitative data were submitted to the Tukey test (p≤0.05) and the quantitative data, the regression test (p≤0.01) was performed in the SISVAR ® Statistical Program. However, studies on no-tillage and the correlation with sowing depths show important evaluations in the physiology of weeds, for example: germination and seedling emergence, which are growth variables that reflect on the inference of the effect of the depth of sowing and compromise the expression of seed vigor and seedling length, since they are important assessments for estimating growth and development, as well as their direct effects on crops, and from these results, attempts are made to seek solutions within alternative management, in order to reduce growth and consequently try to control weeds, in order to ensure efficiency in the yield of economically important crops. The no-tillage system using corn straw at greater sowing depths influenced the lower performance in the physiology of Bidens pilosa.
O Grupo Cataratas de Eficiência Energética (GCEE) é constituído por docentes e discentes do CECE da Unioeste - Foz do Iguaçu, e tem por finalidade enriquecer a formação de seus integrantes por meio de atividades de projeto, construção e manejo de veículos para competições de eficiência energética para veículos movidos à energia elétrica e etanol. A equipe já participou de diversas competições sendo a detentora do recorde latino-americano na categoria etanol (736 Km com um litro de etanol).
da ECA foi a que promoveu maior valor de SST no terço médio do colmo (14,81ºBrix). PALAVRAS-CHAVE: estresse hídrico; lâmina de água; manejo da irrigação. VEGETATIVE DEVELOPMENT AND TOTAL SOLUBLE SOLID OF SACRED SORGHUM UNDER IRRIGATION BLADESABSTRACT: It is of great interest to develop research that supports the cultivation of sacred sorghum in the different climatic regions of the country, especially those necessary for the
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