Banca de DEFESA: CAMILLA SANTOS REIS DE ANDRADE DA SILVA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : CAMILLA SANTOS REIS DE ANDRADE DA SILVA
DATE: 21/10/2020
TIME: 14:00
LOCAL: Sala Zoom
TITLE:

Evaluation of soil quality in different organic management systems for vegetable production in Seropédica (RJ).

KEY WORDS:

Soil attributes. Agroecological management. Olericulture

PAGES: 80
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Manejo e Conservação do Solo
SUMMARY:

Conservation management techniques promote the recovery of the productive potential of the soil and enable the sustainable management of this natural resource. These techniques present approaches equivalent to the principles of organic production systems. It is believed that no-tillage, by maintaining vegetation cover, reducing soil disturbance and prioritizing soil conservation, constitutes a strategic tool to enhance sustainability in the organic cultivation of vegetables. The general objective of the work was to evaluate the effect of direct planting of vegetables on soil attributes in organic production systems, in a Red-Yellow Argisol in Seropédica (RJ). The study was conducted at SIPA-Integrated System of Agroecological Production, better known as Fazendinha Agroecológica Km 47, located in Seropédica-RJ. Three organic management systems were evaluated: a) no-till system (PD) using straw shredder (Triton); b) conventional tillage of the soil, using the rotary hoe (PC-ER) and; c) conventional soil preparation, using a plow and two harrows (PC-AG). The planting of the vegetables was carried out after the pre-cultivation management that refers to the intercropping of corn with legumes (pork beans, crotalaria and mucuna). The experimental design used was a randomized block with three treatments and four replications. Vegetable productivity was assessed over five agricultural years. The deformed and undisturbed soil samples, in the 0-5 and 5-10 cm layers, were collected in 2018, four years after the implementation of the experiment, for the evaluation of the following soil attributes: granulometry, aggregation and organic carbon content in aggregates, soil density, particle density, total porosity, resistance to penetration, gravimetric moisture, light fraction of organic matter, soil fertility, total organic carbon and edaphic macrofauna. The results showed that there was no significant difference between the means of soil management treatments for most of the evaluated physical attributes. One of the attributes that showed a statistical difference was the resistance to soil penetration at a depth of 0-25 cm. The PC-AG treatment showed less resistance than the PD and the PC-ER. This lower resistance to penetration in the PC-AG treatment is conditioned by the effect of the recent soil turning (approximately one month) in the experimental area. Regarding chemical and biological attributes, the carbon content in the soil aggregates, the free light fraction and the soil fauna were sensitive to management practices. The first two attributes were superior in the PC-ER in the 0-5 cm layer. The PD treatment favored the higher density and richness of the soil fauna groups, which is considered an important biological indicator of soil quality. Four years after the implementation of treatments, the different agricultural practices of organic soil management, in addition to providing levels equal to the adequate national average for the productivity of vegetables, also favored the maintenance of soil fertility and physical quality.

BANKING MEMBERS:
Presidente - 1740899 - ERIKA FLAVIA MACHADO PINHEIRO
Interno - 1060711 - MARCOS GERVASIO PEREIRA
Externa à Instituição - BETA EMOKI MADARI - EMBRAPA