Optimisation de la fertilisation de la pelouse afin de réduire les pertes en azote par lessivage

Authors: Côté, Laura
Advisor: Grégoire, Guillaume
Abstract: Turfgrass-covered surfaces represent a considerable area in many cities and those provide several ecological services. Unfortunately, the supply of fertilizers to maintain these surfaces in residential areas can be a threat for water quality due to nutrient losses, mainly as nitrogen,through leaching.In order to reduce the environmental impact of this practice, the nitrogen source, rate and number of applications can be managed to reduce losses in the form of nitrate (N-NO3) and ammonium (N-NH4). An experiment consisting of a completely randomized block design with four replicates was established in a greenhouse. Eight sources of N: urea, coated urea:(Polyon® 8 or 12 weeks release, Duration® 45 or 90 days release and XCU®), stabilizedurea (UFLEXX®) and a natural fertilizer (corn gluten) were evaluated under five rates (25,50, 100, 150 and 200 kg N/ha) and two application patterns (one or two applications) using a factorial design. Two 8-week trials were conducted in three soil types (loam, clay, sand). Results from this experiment were used to identify treatments evaluated in a second experiment using a similar approach, but over a longer period of 20 weeks. Mean N-NO3 concentrations below 4 and 2 mg/L were measured in the short and long-term experiments, respectively. XCU® and UFLEXX® were not as effective as other nitrogen sources to reduce N-NO3 leaching compared to urea. Losses of NO3-N were mostly affectedby establishment and soil properties in loam and clay in short and long trials. A rate of 150 kg N ha-1 was generally required to obtain acceptable turf quality while resulting in lowlosses. The results obtained during this study should be validated in a field experiment.
Document Type: Mémoire de maîtrise
Issue Date: 2021
Open Access Date: 25 October 2021
Permalink: http://hdl.handle.net/20.500.11794/70727
Grantor: Université Laval
Collection:Thèses et mémoires

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