Digestates main characteristics and residual biodegradability: influence of waste origin and management of the digestion plant
© European Compost Network ECN e.V. (6/2014)
Digestates have to be properly valorized as soil improvers or organic fertilisers in order to ensure good environmental and economic performance of the whole anaerobic digestion treatment scheme. Nevertheless, determinants of the digestates quality and digestates residual biodegradability have raised little interest even as they determine their conditions of storage, use or post-processing. The aim of the present study was thus to propose determinants of digestates quality and to assess their residual biodegradability and its impact in terms of further storage or post-treatment.

Sensitivity analysis of a dynamic soil-plant model for simulations of fate of pollutants after repeated applications of amendment on agricultural soils
© European Compost Network ECN e.V. (6/2014)
In 2009, Veolia Environnement Research and Innovation, the Institut National de la Recherche Agronomique and the Technical University of Denmark have started a large research cooperation to develop a mathematical model dedicated to the assessment of the fate of organic substances and metals in agricultural soils, after repeated applications of Residual Organic Products (ROP, e.g : sludge, composts). This dynamic model predicts the concentrations of substances in different compartments of the agricultural ecosystem and fluxes in groundwater over time, as a function of approximately a hundred input (physicochemical properties and concentration of substances, environmental conditions, crop characteristics).

Crop response to alternative organic treatments
© European Compost Network ECN e.V. (6/2014)
The aim of the research is to assess the effects of novel wastes, composts and biochar on commercial arable and horticultural crops, and the impact on soil quality. The research will focus on determining the benefits of replacing inorganic fertilisers with novel wastes and compost (such as chicken manure and olive mill waste (OMW)) along with the carbon sequestering properties of biochar.

Use of compost from grape pomace as organic amendment for recoverying a decayed pear (Pyrus communis cv Packam’s Triumph) ORCHARD
© European Compost Network ECN e.V. (6/2014)
During two growing seasons, an experiment was performed to evaluate the effects of mature compost from grape pomace on the recovery of a pear (Pyrus communis L.) orchard. Two treatments (T1: control, T2: Integrated plant nutrition, IPN) were compared. The IPN consisted on the application of 20 ton/ha of compost, together with chemical fertilization of 70 kg N/ha, 20 kg P2O5/ha and 66 kg K2O/ha; the control treatment included only chemical fertilization.

Effect of compost treatments on the growth of the strain field area of apple trees, and on the number of fruits per tree
© European Compost Network ECN e.V. (6/2014)
The effect of different compost doses on the nutrient contents of the soil (in depth of 0-30) were measured in an apple orchards (organic and integrated). Growth of the strain field area of different apple species (Golden Delicious and Pinova) and the number of fruits per tree were determined (2010-2012).

Pelletized compost can be a superior alternative to phosphate fertilizer compared to bulk compost
© European Compost Network ECN e.V. (6/2014)
Manure is used as fertilizer and for soil amendment if handled appropriately, although it is the leading source of agricultural pollution if mismanaged. Because of the high water content, long-range haulage is uneconomical. Therefore, manure is mostly applied at high dose, close to the source, thereby diminishing its potential in soil amendment. Composting and pelletization facilitate manure exports, including storage, handling, and transport, for off-farm use and field application.

Vegetable crop residues as feedstock for composting and silage: collection efficiency and product quality
© European Compost Network ECN e.V. (6/2014)
The crop residues of vegetables are important for nutrient and organic matter cycling. However, these residues often may lead to nitrogen leaching risks. This study investigates the feasibility of removing crop residues, followed by composting or ensiling as a means to reduce N leaching losses.

Effect of compost source and soil type on canola yield and nutrient uptake from calcareous and acid soils under greenhouse conditions
© European Compost Network ECN e.V. (6/2014)
Composting is an alternative manure management strategy with lower transportation cost than fresh manure. This study investigates the effect of compost applications on canola yield and nutrient uptake under controlled greenhouse conditions.

Effects of different biochars and combined biochar and anaerobic digestate utilization on rye-grass and soil properties in laboratory model experiment
© European Compost Network ECN e.V. (6/2014)
Recycling of organic wastes and preparation of added value products such as biochar or anaerobic digestate are challenges for a sustainable agriculture. Utilization of biochars to improve soil fertility and to mitigate global climate change is a popular research area. Residual of anaerobic digestion can be used as soil amendment as well, since it contains high amount of different macro-, and micronutrients mainly in water soluble form. Combination of digestate and biochars can cause various interactions, between digestate-biochar and soil system.

Effect of Intensity and Time of Aeration on Agrochemical Properties of Extracts from Vermicompost
© European Compost Network ECN e.V. (6/2014)
Vermicomposting is a completely environmentally friendly technology which converts biowaste to a value-added product. Extracts from vermicompost can be applied to plant surfaces and soils in ways not possible or economically feasible with solid vermicompost. The aim of this work was to determine the influence of aeration intensity and time of extraction on the agrochemical properties of aqueous extracts from two types of vermicomposts. Vermicomposts were made from horse manure (M) and apple pomace (P) waste.

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