Suivi de la minéralisation vernale en culture de froment et colza. Résultats d’expérimentations menées à GxABT

In 2014, Grenera was inserted in two experiments in the Gembloux region by the Crop Unit Temperate Regions of Gembloux Agro-Bio Tech (ULg) and the APPO respectively on winter wheat and oilseed rape 'winter.
The objectives of such monitoring were
 to measure the mineralization of humus in order to contribute to the validation of fertilization tips and more specifically the term relating to the production of nitric nitrogen by the vegetation being ground;
 to confirm that fertilization does not lead to leave in the soil at harvest, a nitrogen balance significantly higher than that observed in the presence of reduced or no fertilization.
In 2014, following an unusually mild winter, vegetation recovery was rapid and early in winter oilseed rape and winter wheat.
The observations made during these experiments have confirmed the second argument in the context of two cultures followed.
As regards the mineralization potential of the soil, a difference was observed between winter wheat and winter rape plots. In the latter, the production of nitric nitrogen vegetation being was only slightly exceeds 50 kg NO3-N / ha while the winter wheat parcel, the mineralization of humus soil brought some 90 kg NO3-N / ha during the same period (February-July 2014); these two values ​​are however higher than expected as estimated by the harmonized method REQUASUD - Nitrawal (about 30 kg NO3-N / ha for rapeseed and 60 kg NO3-N / ha for wheat).
These observations, coupled with those made earlier this year by Grenera and UCL scientists Nitrawal members will contribute to the validation or adaptation of the references used for the nitrogen fertilization advice to achieve an optimal agronomic performance and environmental impact minimum.