Which method of nitrogen application is typically slower than others?

The method of nitrogen application that is typically slower than others is injection. This technique involves placing nitrogen directly into the soil, which allows for gradual nutrient uptake by plants. Because the nitrogen is delivered deeper into the soil, it can be a slower process for the nitrogen to become available to plant roots compared to methods where the nitrogen is applied on the surface or very close to the plants.

Broadcasting distributes nitrogen uniformly over the soil surface, allowing for quick absorption by plants but can lead to greater losses through volatilization or runoff. Sidedressing applies nitrogen alongside the growing crop, which can facilitate rapid uptake but still exposes the nitrogen to surface losses. Topdressing, similar to broadcasting but often used on established crops, also tends to allow for quicker absorption.

Overall, injection is designed to minimize nitrogen loss and maximize efficiency by placing it directly in the root zone, which can result in a more prolonged response in plant nutrient uptake compared to the other methods that present nitrogen more immediately to the plants.