Abstract
ABSTRACT: Weeds are one of the main obstacles in the recovery of degraded areas. This research aimed to study the selectivity of herbicides on Trema micrantha (Jamaican nettletree), Schinus molle (Peruvian peppertree), and Apuleia leiocarpa (garapeira) seedlings. An experiment was installed in Junqueirópolis and another in Jaboticabal/SP, Brazil. The experimental design used was completely randomized design with four replications. Treatments consisted of clethodim + fenoxaprop-p-ethyl (50 + 50 g a.i. ha-1), sethoxydim (184 g a.i. ha-1), quizalofop-p-ethyl (75 g a.i. ha-1), nicosulfuron (50 g a.i. ha-1), fluazifop-p-butyl (125 g a.i. ha-1), fomesafen (225 g a.i. ha-1), haloxyfop-methyl (48 g a.i. ha-1), bentazon (720 g a.i. ha-1), chlorimuron-ethyl (15 g a.i. ha-1), and control without herbicide. The analyzed characteristics were stem diameter, plant height, and phytointoxication at 7, 14, 21, 28, 35, and 42 days after herbicide application (DAA), in addition to shootdry matter accumulation in seedlings at the end of the study. Nicosulfuron and chlorimuron-ethyl caused intoxication in all the studied tree species. In Jaboticabal, these herbicides impaired the initial growth of Jamaican nettletree seedlings, while no herbicide delayed its initial development in Junqueirópolis.A similar result was obtained regarding dry matter accumulation for garapeira in both cities. The herbicides clethodim + fenoxaprop-p-ethyl and sethoxydim decreased dry matter accumulation in Peruvian peppertree plants in Jaboticabal and Junqueirópolis, respectively, thus not being recommendedtheir use for these species.
Highlights
A recent analysis estimated that Brazil has about 21 million hectares of native vegetation deficit in permanent preservation and legal reserve areas (Soares Filho et al, 2014)
Studies with different herbicides to control weeds in areas of recovery of native vegetation is a new researchline since the use of glyphosate has some limitations, as it is efficient only when the application is directed at the target
The herbicide bentazon caused symptoms of intoxication in the plants from 21 days after herbicide application (DAA), which were more intense at 28 DAA
Summary
A recent analysis estimated that Brazil has about 21 million hectares of native vegetation deficit in permanent preservation and legal reserve areas (Soares Filho et al, 2014). Sectors of society together with relevant government agencies are engaged in actions that encourage rural entrepreneurs to conserve and recover their degraded biomes over the years. In this fact lies the importance of creating mechanisms that accelerate the recovery process of degraded areas. The most adequateand fast weed control method for extensive recovery areas of native tree vegetation is the chemical (Peter and Harrington, 2009). Studies with different herbicides to control weeds in areas of recovery of native vegetation is a new researchline since the use of glyphosate has some limitations, as it is efficient only when the application is directed at the target
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
