N2 for asparagus
How much Nitrogen is recommended for asparagus ?
Marion County Oregon soil and fertility issues
Ask an Expert is happy to help with your asparagus fertilizer question.
If the bed is in the first three years, you would be using more nitrogen than you would once the bed is established. If you are using high nitrogen organic matter in the beds, you would use somewhat lower amounts.
New plantings: Oregon State University recommendations are for 3.7 ounces of nitrogen per 100 square feet of asparagus bed. This translates to just under 2 pounds of a 12% nitrogen product, such as blood meal. For a 5% nitrogen product, you would need around 4.5 pounds.
For new plantings, half of the nitrogen is applied in spring and half when the spears are up about 6 inches.
Established plantings (three- to four-year old beds): Use 2.9 ounces of nitrogen per 100 square feet of bed. That’s about 1.5 pounds of a 12% nitrogen product, such a blood meal, or about 3.5 pounds of a 5% nitrogen product.
To ensure that other nutrients are available to the plants, maintain the pH of the bed between 6.0 and 7.5.
This publication is written for the production farmer, but may be of interest to you.