Banca de QUALIFICAÇÃO: JONAS OLIMPIO DE LIMA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : JONAS OLIMPIO DE LIMA SILVA
DATA : 07/07/2022
HORA: 14:30
LOCAL: Videoconferência
TÍTULO:

Mineral nutrition of cocoa cultivated in full sun and traditional cultivation system

PALAVRAS-CHAVES:

Theobroma cacao, nutrient cycling, green manure crops, cabruca

PÁGINAS: 18
GRANDE ÁREA: Outra
ÁREA: Ciências Ambientais
RESUMO:

The use of cover crops intercropped with perennial crops has provided improvements in the physical, chemical and biological quality of the soil. The full sun cocoa system with cover crops is a recent practice in the southern region of Bahia and needs further evaluation. Thus, the study was developed with the objective of evaluating the mineral nutrition of cacao in a full sun system intercropped with cover crops and traditional cultivation system. The experiment was carried in the CEPLAC (Comissão Executiva do Plano da lavoura Cacaueira/ Cocoa Research Center) in Ilhéus, BA. The full sun system was carried out in a randomized block design, with 04 treatments (brachiaria, legumes, spontaneous plants and without ground cover) and 04 replications. An agroforestry system, considered a reference, installed in an area close to the system in full sun was also evaluated. The full sun system was implemented in July 2019 with a spacing of 1.5m x 4.0m, between cacao trees and interrows, respectively. Initial shading with cassava was used, which was completely suppressed for implantation of treatments. In March 2020, the cover crops were sown interrows of cocoa trees and after full development (flowering), the aerial part was managed through mowing. Soil sampling was carried out in the 0-20 cm layer and healthy leaves of cocoa trees for analysis of nutritional composition, in the years 2020 and 2021 to evaluate the nutritional composition (macro and micronutrients). The consortium of Brachiaria with cocoa trees in a full sun system increased potassium levels approximately 3 times compared to the initial levels of this element in the soil. The use of cover crops in a full sun system decreased foliar nitrogen and zinc levels and increased potassium levels in the evaluated years. The desiccated full sun system, intercropped with spontaneous vegetation and legumes, showed an increase in foliar phosphorus levels in relation to the intercropping with brachiaria. The full sun system showed higher levels of potassium in the soil in all treatments studied compared to the agroforestry system. On the other hand, the agroforestry system presented higher levels of organic matter in relation to the system under full sun uncovered and intercropped with spontaneous vegetation. It also presented higher levels of Zn in relation to the system in full sun intercropped with legumes and higher levels of B when compared to the system in full sun intercropped with spontaneous vegetation. The cabruca system presented foliar contents of nitrogen, potassium, phosphorus (only in the treatment with brachiaria), iron and copper higher than the system in full sun. While the elements calcium, magnesium and zinc (Brachiaria treatment) were superior in the full sun system in relation to the agroforestry system. The agroforestry system presented foliar contents of nitrogen, potassium, phosphorus (only in the treatment with brachiaria), iron and copper higher than the system in full sun. While the elements calcium, magnesium and zinc (Brachiaria treatment) were superior in the full sun system in relation to the agroforestry system.

MEMBROS DA BANCA:
Presidente - 1126298 - JAQUELINE DALLA ROSA
Externo ao Programa - 1720621 - CARLOS EDUARDO PEREIRA
Externo à Instituição - GEORGE ANDRADE SODRÉ
Externo à Instituição - PAULO CESAR LIMA MARROCOS