Superação da profundidade de semeadura e densidades de palha para Mucuna aterrima, Mucuna deeringiana e Mucuna cinerea

Abstract

-The experiment was conducted in a greenhouse to verify the ability of Mucuna aterrima, Mucuna cinerea and Mucuna deeringiana seeds to overcome different soil depths plus sugarcane straw densities. The experimental design was completely randomized with the treatments arranged in a factorial scheme 3 x 3 x 3 and four replications. The factors consisted of straw layers (0, 5, and 10 cm), Mucuna species (M. aterrima, M. cinerea and M. deeringiana) and sowing depth (1, 4 and 8 cm). The Mucuna species exceeded the sowing depth by 23 t ha -1 straw and up to 8 cm, exposing the shoot to the surface from 10 days after emergence and also being able to develop height (> 96 cm per plant), leaf area (> 723 cm -2 per plant) and dry mass accumulation (> 2.09 g per plant) up to 35 DAS.

Influence of Sugarcane Straw and Sowing Depth on the Emergence of Weed Species

“…Similar results by Silva et al (2013) showed that this species was indifferent to the presence or absence of straw, which was Orig: original data; Transf: transformed data by arc sine (x/100); ns (non-significant); * (significant at a level of 5% probability by F Test); CV (coefficient of variation). Influence of sugarcane straw and sowing depth of the ... a condition that was also observed in the present study because the plants were able to overcome 10 cm of soil plus 15 t ha -1 of straw.…”

“…In this study, it was also observed that a straw amount of 8 t ha -1 resulted in a higher value of dry matter. Silva et al (2013) did not find effects of sowing depth on the dry matter content of Orig. original data; Transf: transformed data by arc sine (x/100); ns (non-significant); ** (significant at level of 1% probability by F-test); CV (coefficient of variation).…”

“…Silva et al (2013) found that for foliage area, the interaction with sowing depth did not present a statistical difference, however the deposition of straw on the soil surface was significant and higher amounts of this coverage (9 and 23 t ha -1 ) resulted in seedlings with higher photosynthetic areas.…”

“…Silva et al (2013) observed that M. aterrima presented their highest emergence when the seeds were near the soil surface and with no straw, but also observed that this species was able to overcome 23 t ha -1 of straw and up to 8 cm of sowing depth.…”

Resposta de glyphosate em mucuna-preta desenvolvida em diferentes temperaturas

“…ex Wight) Baker ex Burck) é uma leguminosa herbácea anual da família Fabaceae, com ramos trepadores e vigorosos que adapta-se bem a climas tropicais e subtropicais (Wutke, 1993). Muito utilizada como adubo verde devidos aos diversos benefícios, como a fixação de nitrogênio simbiótico, reciclagem de nutrientes, controle de erosão e melhoria do solo em sua estrutura física (Wutke, 1993), supressão de nematoides (Giraldeli et al, 2017) e de plantas daninhas (Silva et al, 2013). Contudo, devido ao manejo inadequado com a incorporação dessa espécie ao solo com sementes próximas à maturação e aos fatores relacionados às características da semente, como alto vigor, dormência e germinação escalonada, contribuíram para que essa espécie se tornasse uma importante planta daninha no cenário agrícola (Silva et al, 2012).…”