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Perramon B.,La Garrotxa Volcanic Zone Natural Park | Perramon B.,University of Lleida | Bosch-Serra A.D.,University of Lleida | Domingo F.,IRTA Mas Badia | Boixadera J.,University of Lleida
European Journal of Agronomy | Year: 2016

The efficient use by crops of nitrogen from manures is an agronomic and environmental issue, mainly in double-annual forage cropping systems linked to livestock production. A six-year trial was conducted for a biennial rotation of four forage crops: oat-sorghum (first year) and ryegrass-maize (second year) in a humid Mediterranean area. Ten fertilization treatments were introduced: a control (without N); two minerals equivalent to 250 kg N ha-1 year-1 applied at sowing or as sidedressing; dairy cattle manure at a rate of 170, 250 and 500 kg N ha-1 year-1 and four treatments where the two lowest manure rates were supplemented with 80 or 160 kg mineral N ha-1 year-1. They were distributed according to a randomized block design with three blocks. The highest N mineral soil content was found in the summer of the third rotation, in plots where no manure was applied. The yearly incorporation of manure reduced, in successive cropping seasons, the amount of additional mineral N needed as sidedressing to achieve the highest yields. Besides, in the last two years, there was no need for mineral N application for the manure rate of 250 kg N ha-1 year-1. This amount always covered the oat-sorghum N uptake. In the ryegrass-maize sequence uptakes were as high as 336 kg N ha-1 year-1. In the medium term, the intermediate manure rate (250 kg N ha-1 year-1) optimizes nutrient recycling within the farming system, and it should be considered in the analysis of thresholds for N of organic origin to be applied to systems with high N demand. © 2016 Elsevier B.V.

Isamat E.B.,La Garrotxa Volcanic Zone Natural Park | Ramos B.P.,La Garrotxa Volcanic Zone Natural Park | Carrera J.M.M.,La Garrotxa Volcanic Zone Natural Park | Bosch J.F.,La Garrotxa Volcanic Zone Natural Park
Management of Environmental Quality | Year: 2011

Purpose: This paper aims to describe the situation of the agrobiodiversity in La Garrotxa Volcanic Zone Natural Park, a protected area in which the agricultural and animal husbandry sectors play a significant role. It also aims to discuss the activities promoted by the park and by other institutions aimed at conserving and promoting local agrobiodiversity. Design/methodology/approach: One of the three lines of work in the Natural Park in the field of agriculture is the recuperation, conservation and divulgation of notable and/or endangered agricultural species and varieties. This paper describes some of the work carried out in this field. Findings: The institutions are vital in the recovery of interesting species and varieties, and in order to ensure their conservation it is essential to promote projects in which the agrarian sector can participate. Research limitations/implications: Collaboration between the institutions and the agrarian sector is essential for the conservation of the agrobiodiversity, although the interests of farmers and the use of certain species and varieties do not always coincide. Practical implications: The commercial interest and the knowledge of the use and management of some of the conserved species and varieties may have been lost over time, which makes their implantation difficult. Thus, it is important to restore popular knowledge associated with all species and varieties. Originality/value: In light of increasingly homogeneous agricultural and stock-raising practices, activities such as those implemented by the La Garrotxa Volcanic Zone Natural Park have a vital part to play in the conservation of agrobiodiversity. © Emerald Group Publishing Limited.

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