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Períodos de interferência de plantas infestantes na cultura da mandioca, submetida ou não à adubação NPK, em Vitória da Conquista-Ba

2019; Sociedade de Ciências Agrárias de Portugal; Volume: 42; Issue: 1 Linguagem: Inglês

10.19084/rca18166

2183-041X

Maurício Robério Silva Soares, Alcebíades Rebouças São José, Renan Thiago Carneiro Nunes, Ricardo de Andrade Silva, Ana Paula Oliveira Caetano, Denise Soares Oliveira, Cláudio de Azevedo Nolasco, Mariana Costa Rampazzo,

Agronomic Practices and Intercropping Systems

The objective of this study was to evaluate the phytosociological survey and determine the critical periods of weeds competition with the cassava crop, submitted or not to NPK fertilization. Therefore, the weeds were collected every 35 days, until 525 days after cassava planting, through the random release of a cast iron square 0.5 m x 0.5 m (0.25 m2) in plots with and without fertilization. The plants inside the square were cut close to the ground, counted and identified by species. Sida rhombifolia, Brachiaria plantaginea and Cynodon dactylon showed the highest FR, DR, AR and IVI. Subsequently, the yield data of storage roots were adjusted to non-linear regression model sigmoidal Boltzmann to determine the critical periods of competition: PAI, TPIC and PCPI. The fertilizer supplied to cassava crop contributed to the determination of different phytosociological indices and critical periods of competition.