Banca de QUALIFICAÇÃO: JAQUELINE LIMA DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : JAQUELINE LIMA DA SILVA
DATE: 30/04/2024
TIME: 14:00
LOCAL: Auditorio do Pgagro
TITLE:

NATIVE FUNGI OF THE AMAZON AS GROWTH INDUCERS IN THE CULTURE OF Lactuca sativa L. IN PERIURBAN AGRICULTURE

KEY WORDS:

Lettuce; Economic efficiency, Bioproducts

PAGES: 45
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitotecnia
SPECIALTY: Manejo e Tratos Culturais
SUMMARY:

(Lactuca sativa L.) is the most consumed leafy vegetable in Brazil. It is often grown in urban and peri-urban areas due to the proximity of consumer centers and the ease of planting in small spaces. In addition to being a source of vitamins, mineral salts and fiber, it is also used in the production of cosmetics and has medicinal applications. In view of the growing demand for consumption, producers are impelled to increase the productivity of the areas, however, they face challenges such as pests and diseases, as well as the need for rapid production. In view of this, it is essential to use products that accelerate growth, increase resistance to pests and diseases, optimize plant nutrition and favor a more sustainable and profitable production. This study aimed to evaluate the growth of plants subjected to biostimulation with the fungi native to the Amazon, Trichoderma asperellum, Metarhizium anisopliae and Beauveria bassiana together with reduced fertilization. It is assumed that the combination of fungi and less use of fertilization efficiently promote the growth of lettuce cv. Monica and reduce the producer's costs. The study was conducted in a commercial area in Marituba/PA, using a completely randomized design. Five treatments were established: T1 - 100% Organic fertilization (chicken manure, standard of the commercial area); T2 - 50% of fertilization + T. asperellum; T3 - 50% of fertilization + M. anisopliae; - T4 - 50% of fertilization + B. bassiana; and T5- 50% of fertilization + Mix (B. + M.). Each treatment consists of 5 repetitions, totaling 20 experimental units. The biometric parameters, number of leaves (n), height (cm) and diameter of the collection (cm), robustness index (al/dc) and root length (cm) were evaluated. Productivity parameters, dry root mass (g), fresh root mass (g), fresh mass of total leaves (g) and fresh mass of commercial leaves (g). Physiological parameters, CO² assimilation rate (μmol m-2 s-1), stomatic conductance (μmol m-2 s-1), intercellular CO² (μmol mol-1), perspiration (mμmol -2 s-2s-1), carboxylation rate and the efficient use of water. The data were subjected to analysis of variance (ANOVA) and the Duncan test to compare the means, both at 5% probability of error.

 

According to Duncan's test, for biometric analyses, the treatment (T2, T4 and T5) showed higher averages for the variables number of leaves, diameter of the stem and root length, while (T1) presented the lowest means for all variables. In the productivity analyses, the treatment (T2) showed higher averages for all variables. While (T1) presented the lowest averages for all variables. In the physiological analyses, the treatment (T1) showed higher averages for internal carbon and perspiration and the treatments (T2 and T5) showed higher averages for liquid photosynthesis, stomatic conductance and carboxylation efficiency. This suggests that the incorporation of these microorganisms can optimize the nutrition of plants. Economic analyses were conducted, following the methodology established by the Supply Company (CONAB), to evaluate all costs related to services and inputs. The calculations were carried out based on a commercial site of 24 m², where the fungi M. anisopliae and T. asperellum obtained the best results. It was observed that the average cost per set of lettuce, when applied organic fertilization, is R$2.16, while with the application of M. anisopliae is R$1.03, and with the application of T. asperellum it is R$1.09, evidencing the economic efficiency of the use of the use of bioinputs. Thus, biostimulation with these microorganisms can be considered a management strategy, with the objective of reducing the amount of fertilization, contributing to the reduction of costs, greater profit margin and greater sustainability of production.

 

KEYWORDS: Lettuce; Economic efficiency, Bioproducts.

COMMITTEE MEMBERS:
Presidente - 3266519 - TELMA FATIMA VIEIRA BATISTA
Interno - 1743866 - MARCOS ANTONIO SOUZA DOS SANTOS
Externo à Instituição - SERGIO ANTONIO LOPES DE GUSMAO - UFRA