Lead researcher: 
D. Quílez Saez de Viteri
21.600 €
In the province of Teruel pig production is a very important economic activity, but this intensive production is associated with the generation of a large quantity of slurry. One of the environmental challenges facing this sector is the environmentally correct management of the slurry generated. The most effective and economical method of dealing with this problem is through the recycling of the nutrients contained in the manure as fertilizer for crops in the area. The application of slurry to agricultural soils is not without problems and a major challenge is to increase the efficiency of use of nutrients, in particular N, which contains and thus reduce losses, which can have negative effects on the environment, Being of special relevance the emission of ammonia into the atmosphere (acidification of systems and formation of particulate matter), pollution of water by nitrate, and the emission of greenhouse gases.
The project will evaluate the capacity of two products designed in the company FertinAgro SL to increase the efficiency of use of the N of the slurry. The first is an acidifier that reduces the volatilization of ammonia allowing a greater availability for the N culture of the slurry and the second one a compound with inhibitors of the urease / nitrification that slow the transformations of N of the slurry after its application to the soil as fertilizer . The acidifying product additionally incorporates in its formulation an inhibitor. Ábalos et al. (2014) in a meta-analysis with nitrification and urease inhibitors indicate that these products can effectively reduce the losses of ammonia and nitrous oxide (N2O), a greenhouse gas to the atmosphere.
A field test will be carried out by adding the products to the slurry to assess the reduction of ammonia volatilization after application, reducing N2O gas emissions with a potent greenhouse effect and improving the efficiency of N use by the culture.
The capacity of the molecules to avoid volatilization and to slow the rate of conversion of the purine N to nitrate (urea> NH4 +> NO3-) will be assessed. It is expected that the acidifier will be able to reduce losses of N by volatilization by at least 30%, that N being available for the plant. The urease / nitrification inhibitor product added to the slurry is expected to slow down the ammonification and nitrification processes with longer availability in the N-time of the slurry. This greater efficiency in the use of N will lead to a lower emission of N2O (greenhouse gas) and a lower risk of nitrate washing.
Gobierno de Aragón (Investment Fund for the province of Teruel)
Project members: 
Julia Martin (Fertinagro nutrientes), Ramón Isla and Miguel Izquierdo (CITA)