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| Author(s): |
Arthur Duarte Rodrigues Neto
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Ilha Solteira. 2023-09-18. |
| Institution: | Universidade Estadual Paulista (Unesp). Faculdade de Engenharia. Ilha Solteira |
| Defense date: | 2023-02-24 |
| Advisor: | Evandro Pereira Prado |
| Abstract | |
The yield of the corn-brachiaria intercropping can be optimized by managing weed competition through the application of selective herbicides to the corn crop. Five experiments were carried out to verify the interference of droplet classes and application volumes on the performance of the mixture of atrazine (ACLAMADOBR - SC) with nicosulfuron (NICO - OD) in weed management in the corn-brachiaria intercropping. Experiment 1: elaboration of dose-response curves in Urochloa ruziziensis, cultivated in pots in a greenhouse, to the herbicides atrazine and nicosulfuron applied alone and in mixture, aiming to determine their effects and working dose. Experiment 2: quantification of deposition, coverage and droplet density of treatments with fine, medium, coarse and very coarse droplets at application volumes of 77 L.ha-1 and 144 L.ha-1. Experiment 3: verification of droplet spectra characteristics of treatments using the image drop analysis method. Experiment 4: quantification of the potential for treatment drift in a wind tunnel, and Experiment 5: field experiment, in duplicate, aiming to verify the interference of treatments in weed management in the corn-brachiaria consortium. The dose of the mixture of atrazine and nicosulfuron used as a working dose, based on dose-response curves (Experiment 1), was 2500 + 15 g i.a. ha-1. The data from the other experiments were subjected to analysis of variance and compared by the Scott-Knott test at 5%. The deposition of treatments at a volume of 77 L.ha-1 was more uniform, while coverage was higher in treatments with a volume of 144 L.ha-1 (Experiment 2). Both the droplet spectrum characteristics and the correlations between application variables varied depending on the interaction between nozzle, droplet class and application volume (Experiment 3 and Experiment 4). The dry mass yield of the brachiaria area or consortium grains in scenarios of low weed plant density was not affected by treatments. In the scenario of higher weed plant density, the volume of 144 L.ha-1 offered better control, reflecting positively on the consortium grain yield (Experiment 5). Weed management in the corn-brachiaria consortium can be carried out with low risk of drift using the very coarse droplet class. (AU) | |
| FAPESP's process: | 20/07059-4 - Interference of different droplet size and spraying volume on the atrazine and nicosulfuron mixture performance on weed competition in the maize-brachiaria (Urochloa ruziziensis) intercrop |
| Grantee: | Arthur Duarte Rodrigues Neto |
| Support Opportunities: | Scholarships in Brazil - Master |