Nitrogen is the main nutrient requirement for corn, and in 2017, 448,000 hectares of grain corn and feed corn were planted in Québec. Current recommendations suggest a nitrogen input of 120 to 170 kg per hectare (Parent and Gagné, 2010), but the current nitrogen dose is closer to 200 kg, and even as much as 240 kg in some cases. This seemingly excessive dose can be attributed to uncertainties about the influence of a number of factors, including climate, soil moisture and drainage, hybrid requirements, crop rotations, tillage, compaction, pH, and subsoil characteristics. Models have been developed based on various parameters to determine the optimal post-emergent nitrogen dose to apply. However, these models are not wholly accurate because they do not take soil health into account. The severity of a soil’s degradation will impact its water content, microbiology, and root development. Thus, it is critical to include this factor in nitrogen management models.
From 2019 to 2023
This work will lead to a reduction in the excessive amounts of fertilizer used by some corn growers.
Ten test sites will operate over a two-year period on farms spread over ten Québec regions to compare the performance of winter and spring cereals.
The goal of the project is to improve biological methods for controlling the cabbage seedpod weevil in canola crops. In this project, initiated by Agriculture and Agri-Food Canada and conducted in Québec by UQAM, IRDA is performing an economic analysis of the practices under study.
Researcher: Luc Belzile
The project compared the nitrogen uptake effects of green manure crops grown for a full season, in association with a main crop, or after it is harvested.