Navegando por Autor "Ferraz-Almeida, Risely"

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    Development of coffee seedlings with biostimulants
    (Editora UFLA, 2021) Moreira, Wanderson Lopes; Ferraz-Almeida, Risely
    Sustainable coffee production has become an alternative to aggregate value to coffee. Biostimulants are presented to increasing coffee quality and production. This study aims to compare and evaluate the application of biostimulants in the initial development of coffee seedlings. An experiment was carried out with applications of biostimulants: (i) 4-indole-3-ylbutyric acid + gibberellic acid + cinetina, AIA+AG+C; (ii) foliar fertilizer + algae, F+A; (iii) vegetal extracts + gibberellic acid, EV+AA. After 94 days of applying the biostimulants, monitored the length of the aerial part (LAP), the number of leaves (NL), stem diameter, root biomass (pivoting, auxiliary and total). Results showed that the F+A promoted the greatest LAP, NL, and root biomass. AIA+AG+C showed similar performance as F+A in NL. There was a higher production of auxiliary roots with biostimulants impacting positively on plant paraments. Given the results, we concluded that biostimulants based on mixed foliar fertilizer + algae demonstrated to be a better alternative to increasing the devel opment of the aerial and root part of coffee seedlings.
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    Organomineral fertilizer in coffee plant (Coffea arabica L.): Fertilizer levels and application times
    (Universidade Federal de Lavras, 2023-09-01) Mota, Raquel Pinheiro da; Ferraz-Almeida, Risely; Camargo, Reginaldo de; Franco, Miguel Henrique Rosa; Delvaux, Julio Cesar; Lana, Regina Maria Quintão
    Coffee (Coffea arábica L.) is a fundamental agricultural commodity in the Brazilian economy, demanding a high amount of nutrients for good vegetative development and productivity. The tested hypothesis was that the use of the organomineral fertilizer promotes coffee production and development due to the greater availability of N, P, and K in the soil. The objective of this study was: (i) to monitor the use efficiency of the organomineral fertilizer rates; (ii) to determine the coffee production and development with the organomineral application. A study was developed with applications of four organomineral rates (75%, 100%, 125%, and 150% of the recommended P2O5 rate), three forms of parceling (one, two, and three applications of the organomineral fertilizer), and one control (100% mineral). Yield, soil, leaves, and plant development were monitored. Results showed that organomineral presented a win-win scenario with adequate disposal of residues and sources of nutrients in agriculture promoting the coffee yield from 49.5 (mineral fertilizers) to 53.5 sc ha-1 (100% of P2O5 in organomineral). The plant height, the diameter of the stem, and the canopy presented a quadratic response to organomineral rates with optimal rates fitted at 127; 140; and 140 %, respectively, but there was no direct effect on yield. The split organomineral applications promoted the contents of P and K in the soil, mainly when associated with higher organomineral rates. The K efficiency use was increased with organomineral application indicating the K was used with more efficiency.