Banca de DEFESA: BRUNO LIMA SANT' ANNA
Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.STUDENT : BRUNO LIMA SANT' ANNA
DATE: 25/08/2021
TIME: 09:00
LOCAL: meet.google.com/oiq-ogzi-wmi
TITLE:
Effect of Agrobio biofertilizer on ponkan mandarin (Citrus reticulata Blanco) production in a SAT orchard in Piraúba, MG
KEY WORDS:
Agrobio; ponkan mandarin; agroecological management; production; agroecological transition; biofertilizer
PAGES: 58
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Fitotecnia
SPECIALTY: Manejo e Tratos Culturais
SUMMARY:
The municipality of Piraúba, MG, currently with 128 hectares of cultivated area with ponkan tangerine (Citrus reticulata Blanco), experienced a strong increase in the planted area between 2010 and 2019. The activity has been gaining economic and social expression, as a source of income and jobs in the municipality, characterized by a base of land exploitation formed by small and medium-sized properties under the family farming system. A growing demand from producers to reduce or eliminate pesticide use, to offer healthy products and to produce in a sustainable way, leads us to consider the use of alternative practices suitable for agroecological and/or organic based systems. Biofertilizers are an option for áreas under the transition process, as a means of protection against pests and diseases, availability of nutrients, increased resistance to biotic and abiotic factors, among other benefits. The present study aimed to evaluate the application of the biofertizer Agrobio in a commercial orchard of ponkan tangerine with SAT certification located in the municipality. The experiment followed a randomized block design, with 4 replications in a factorial arrangement consisting of 7 treatments with Agrobio in the main plot and 4 positions in the subplot. Five concentrations of Agrobio were carried out: 4, 6, 8, 10 and 12%, a control without biofertilizer application and a treatment with FTE BR 10 fertilizer. The 4 cardinal positions composed the subplots. Biofertilizer spraying were carried out in October, November and December 2019 and February and March 2020 and an application of FTE BR 10 (85 g) directly on the soil around the plant in November 2019. Fruit number and diameter located within a 0,64 m2 square were taken at 109, 145 and 177 days after the first spraying (DAPP) carried out on 10/5/2019. Starting from 207 DAPP, the total counting of the fruits and the harvest of the fruits were carried out followed by fresh mass determination. Leaf analysis was performed on leaf samples collected at 207 DAPP. The first three data collected (1, 2 and 3) showed a significant reduction of around 90% in the number of fruits on plants that received 4% Agrobio compared to the FTE treatment in the 3 data collection and the control in the second data collection. There are no differences in this variable for the other treatments. Furthermore, fruit diameter followed the same trend, but the reduction observed for the 4% Agrobio treatment was about 75% compared to the control, with no significant difference in data collection 3. The final number of fruits was not significantly influenced by the treatment with the biofertilizer, suggesting a reduction in the biofertilizer effect as ripening took place. Despite this, the total fresh mass of fruits showed a significant reduction in the treatment that received 12% Agrobio compared to the control. The square method used to collect data on the number and diameter of fruits in the first three occasions showed a strong positive correlation (p=0.01) with the total number and fresh mass of fruits determined at the time of harvest, respectively and may be useful for the producer to estimate production about four months in advance. The biofertilizer concentration, the frequency of application and the application period are variables that may have influenced the results obtained and should be the object of new experiments in order to determine the effectiveness of Agrobio for the cultivation of tangerine ponkan.
BANKING MEMBERS:
Presidente - 345.536.817-49 - NORMA GOUVÊA RUMJANEK - EMBRAPA
Externo ao Programa - 026.339.867-65 - RAUL CASTRO CARRIELLO ROSA - EMBRAPA
Externo à Instituição - LEONARDO CIUFFO FAVER