Avaliação das práticas de gestão da rega e da fertilização nas hortas urbanas de Lisboa: experimentação e modelação. Contributos para uma agricultura urbana ambientalmente sustentável

• Author(s): Tedesco, Sara
• Date: 2013
• Persistent ID: http://hdl.handle.net/10400.5/5652
• Origin: Repositório da UTL
• Subject(s): urban gardens; nitrate leaching; irrigation; fertilization; RZWQM; Lisbon
• Document Type: Master thesis
• Language: Portuguese
• Advisor(s): Cameira, Maria do Rosário; Ferreira, Teresa Barbosa Lobo
• Contributor(s): Repositório da Universidade de Lisboa

Description

Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia

This work aims to study the water and nitrogen (N) related processes in several Urban Gardens of Lisbon and to find alternative management practices in order to minimize the N losses. The applied methodology integrates field experiments and modeling. Five allotments were selected as case studies and characterized in terms of soils and agricultural management practices. The water and N related processes were modeled with RZWQM2. After calibration, RZWQM2 accurately simulated the evolution of the N profiles after the summer and winter fertilization events. The water and N budgets highlight the Granja’s soils leaching potential, estimating an annual drainage of 261 mm and 300 mm for each allotment, containing 230.3 and 359.8 mg L-1 NO3 -. The Ajuda system does not show significant leaching, but the N accumulated below the root zone is high (324 and 518 Kg N-NO3 ha-1). The proposed alternative practices are: control the irrigation frequency by using tensiometers; prepare the organic compost aiming for a C/N within the desired range; fraction the chemical fertilizer applications, or even to discontinue it in the conventional plots due to the adequate soil fertility. Also, given the variability of urban farm management, the quantification of water/N budgets by modeling is suggested