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Soil nitrogen availability in olive orchards after mulching legume cover crop r...

A natural source of nitrogen (N) is needed to increase soil fertility in traditional olive orchards and to maintain the N nutritional status of olive trees. With this aim, we studied the introduction of legume cover crops in two olive orchards, which were converted into mulches and left on the ground as phytomass after they had been cut. The experiments were carried out in Suçães and Qta do Carrascal, NE Portug...

Sustainable management of olive rainfed orchards by the introduction of legumin...

The olive sector has a crucial economic, social, cultural and ecological relevance in the Mediterranean region, where tillage and herbicides application are still generalized practices. However, these practices oppose the recommendations of UE Common Agricultural Policy and thus, management methods that decrease requirement for agricultural chemicals are needed to reduce adverse environmental impacts. Moreover,...

Green manure legumes affect seasonal soil and leaf CO2 exchange rates in an oli...

Management methods that decrease requirement for agricultural chemicals are needed to reduce adverse environmental impacts. Moreover, they can play an important role in atmospheric C02 emission and fixation. We propose green manure legumes to reduce erosion, soil compaction and nitrate pollution, to improve biodiversity, soil carbon sink and fertility, to save fossil fuels and to increase yield and the nutritio...

Short and long-term benefits of white lupin as a cover crop on olive physiology

Several positive effects of cover crops in orchards have been documented, including improvement on soil properties, which are reflected on tree physiological performance and yield. The use of legume species, such as white lupin, can provide other gains since they can fix atmospheric N2, reducing the cost with N fertilizers. However, this species need to be sown every year, which is costly and laborious. So, we ...

Oxidative stress and antioxidant responses in olive tree subjected to cover cro...

Since Mediterranean basin is particularly vulnerable to present and future climate variability and climate change, olive tree will experiment some hard changes in its environment. Under adverse conditions, imbalances in metabolic processes may lead to increased accumulation of ROS, forming a potential threat of oxidative damage to cells. We propose green manure legumes to shift tillage, in order to improve soil...

Impacts of leafroll-associated viruses (GLRaV-1 and -3) on the physiology of th...

Comparing N recovery from legumes grown as green manures in olive orchards

Green manuring is probably the only option for extending on a great scale the acreage of organic fanning in the perennial crops of the Mediterranean basin such as olive groves. Olive growers, in general, do not have animals so the availability of organic manures is not sufficient to maintain soil fertility. In addition, the organic composts approved for organic farming on the market have high prices and are som...

Efeito de sistemas de manutenção da superfície do solo na eficiência do uso da ...

A produção de biomassa pelas culturas está relacionada com a quantidade de radiação fotossinteticamente ativa intercetada (IPAR) e absorvida pelas folhas, bem como à eficiência com que estas convertem a energia radiante em energia química, pela fotossíntese. O objetivo deste trabalho foi o de avaliar a eficiência do uso IPAR pela oliveira (0/ea europaea L.) quando cultivada em diferentes sistemas de gestão do s...

Evolução do estado nutritivo azotado em olival mantido com diferentes cobertos ...

Em olival tradicional as leguminosas são por vezes cultivadas como adubo verde, com o objetivo principal de. que o azoto fixado seja transferido para as árvores, substituindo a aplicação de fertilizantes de síntese industrial. Neste trabalho estudou-se o efeito da introdução de leguminosas como cobertos vegetais no estado nutritivo do olival, avaliado pela concentração ·de azoto nas folhas no período subsequent...

Sequestro de carbono no olival: mito ou realidade?

O homem, através de diversas atividades econom1cas, tem contribuído para o aumento da concentração de dióxido de carbono (C02) na atmosfera. A queima de combustíveis fósseis, o fabrico de cimento a partir de carbonatos e a desflorestação com expansão da área agrícola são as principais atividades humanas associadas à emissão de C02 para a atmosfera . O C02 é um gás com efeito de estufa, capaz de reter radiação t...