Agronomic efficacy of nitrogen biobased fertilising products of co-digested pig manure: Field experiment silage maize 2019

The aim of the project Biobased Fertilisers Achterhoek (in Dutch: Kunstmestvrije Achterhoek) is to make fertilisation practices more sustainable through use of locally available nutrients from renewable sources. The project is part of the Netherlands’ sixth action programme serving the Nitrates Directive. One of the objectives is to determine the nitrogen fertiliser replacement value of biobased fertilising products made from animal manure. A second objective is to assess the risk of nitrogen leaching from these biobased fertilising products. These objectives have been implemented by WUR-Wageningen Environmental Research in a monitoring programme with field experiments on grassland and on arable land with silage maize. This document reports the results of a field experiment with silage maize in the year 2019. Field experiments on grassland and with silage maize on arable land will be continued in 2020.