[Introductory runoff-trials with Agronova-fertilizer]

abonos compuestos aprovechamiento de desechos azote compound fertilizers engrais organique escorrentia feed grasses fertilisation fertilizer application field experimentation fosforo leaching lessivage du sol losses nitrogen noruega norway nutrition des plantes nutritive value organic fertilizers perte phosphore phosphorus plant nutrition potasio potassium ruissellement runoff valeur nutritive valor nutritivo waste utilization