How to Fertilize Asparagus: A Complete Gardener’s Guide
How to Fertilize Asparagus?
To fertilize asparagus, it is recommended to incorporate nutrients with tillage or cultivation prior to planting for even distribution.
In the fall or spring before planting, till the soil 8-12 inches deep and incorporate most of the recommended phosphorus and all of the potassium.
Compost and manure can also be added at this time.
On the day of planting, apply an additional 25-30 lb/acre of phosphate (P2O5) into the trench before placing the crowns.
If using compost, apply the same rate of actual phosphate.
Check the fertilizer label or get a manure/compost analysis to determine the appropriate amount of product to apply.
After planting, apply one-third to half of the recommended rate for nitrogen.
The remaining nitrogen should be side-dressed later in the season when the trenches are backfilled.
Soil amendments can be incorporated before spears emerge in the early spring of the first and second years after planting, based on the soil test and recommendations.
Additional nitrogen may be added if necessary based on the soil organic matter percentage.
Key Points:
- Incorporate nutrients with tillage or cultivation prior to planting for even distribution
- Till the soil 8-12 inches deep and incorporate recommended phosphorus and potassium in the fall or spring before planting
- Compost and manure can be added at this time
- Apply an additional 25-30 lb/acre of phosphate (P2O5) into the trench on the day of planting
- Apply same rate of phosphate if using compost
- Apply one-third to half of the recommended rate for nitrogen after planting, with remaining nitrogen side-dressed later
Did You Know?
1. Asparagus is a dioecious plant, meaning it has separate male and female plants. This implies that if you want to harvest asparagus spears (the edible part), you need to ensure that you have mostly male plants in your asparagus bed. Male asparagus plants produce more spears since they don’t expend energy on producing seeds.
2. Surprisingly, asparagus foliage is actually poisonous to many animals, including cats and dogs. It contains a chemical compound called asparagusic acid that can cause toxicity symptoms such as vomiting, diarrhea, and abdominal pain. If you have pets, it’s important to fence off your asparagus bed to keep them from nibbling on the foliage.
3. The Romans were quite fond of asparagus, and they even had a specialized tool called the “asparagus tongs” or “asparagus peeler.” This utensil, similar to modern-day tongs, was used to gently peel off the outer layer of asparagus stalks before cooking, revealing the tender and more palatable part.
4. Did you know that the color of asparagus can vary? While most people are familiar with green asparagus, there are also white and purple varieties. The difference in color is due to the amount of light the plants receive during cultivation. White asparagus is grown underground to shield it from sunlight, while purple asparagus contains higher levels of natural pigments called anthocyanins.
5. Asparagus has earned a reputation for making urine smell differently after consumption. This peculiar occurrence is not universal, as only around 30% of people seem to experience it. The unique scent is believed to be a result of the breakdown of sulfur-containing compounds, producing a distinctive aroma that can be quite pungent to some individuals.
Incorporating Nutrients Prior To Planting
When it comes to fertilizing asparagus, one key step is to ensure that nutrients are incorporated into the soil prior to planting. This is important for even distribution and to provide a good foundation for the growth of your asparagus plants. By incorporating nutrients with tillage or cultivation before planting, you can ensure that the asparagus plants receive the necessary nutrients from the very beginning.
- Incorporate nutrients into the soil prior to planting
- Ensure even distribution of nutrients
- Provide a good foundation for asparagus plant growth
“By incorporating nutrients with tillage or cultivation before planting, you can ensure that the asparagus plants receive the necessary nutrients from the very beginning.”
Fall Or Spring Tillage For Phosphorus And Potassium
To optimize the incorporation of phosphorus and potassium for asparagus, fall or spring tilling is highly recommended. By tilling the soil to a depth of 8-12 inches, you can ensure that these essential nutrients are evenly distributed throughout the soil. This deep tillage facilitates better access to the nutrients by the asparagus plant roots, thereby promoting healthy growth.
Adding Compost And Manure Before Planting
In addition to incorporating phosphorus and potassium, it is also beneficial to add compost and manure to the soil before planting asparagus. These organic materials provide a rich source of nutrients and help improve the overall soil structure. By adding compost and manure at this time, you can enhance the fertility of the soil and create a favorable environment for the growth of asparagus.
- Incorporate phosphorus and potassium
- Add compost and manure
- Enhance soil fertility
- Create a favorable environment for asparagus growth
Applying Phosphate At Planting
On the day of planting, an additional 25-30 lb/acre of phosphate (P2O5) should be applied into the trench before placing the asparagus crowns. This phosphate application ensures that the asparagus plants receive an initial boost of this essential nutrient, which is crucial for their development. If you are using compost, the same rate of actual phosphate should be applied. It is important to check the concentration of phosphate on the fertilizer label or conduct a manure or compost analysis to determine the appropriate amount to apply.
Adjusting Fertilizer Application Based On Soil Test
Taking into account the soil test report is crucial when determining the fertilizer application for asparagus. If the soil test shows “high” phosphorus levels, for instance, it is advisable to skip the fall or spring broadcast application and only apply the phosphate in the trench. However, a small amount of compost can still be added at planting. By adjusting the fertilizer application based on the soil test results, you can ensure that you are providing the necessary nutrients without causing any imbalances in the soil.
- Consider the soil test report when determining fertilizer application for asparagus.
- If soil test shows “high” phosphorus levels, skip fall or spring broadcast application and only apply phosphate in the trench.
- Add a small amount of compost at planting.
- Adjust fertilizer application based on soil test results to ensure necessary nutrients without soil imbalances.
“Taking into account the soil test report is crucial when determining the fertilizer application for asparagus.”
Fertilization Strategies For Different Growth Stages
Asparagus requires different fertilization strategies at various growth stages. After planting, it is advised to apply one-third to half of the total recommended rate for nitrogen. The remaining nitrogen should be side-dressed later in the season, when the trenches are backfilled. This ensures that the asparagus plants receive a continuous supply of nitrogen as they grow.
In the first and second years after planting, it is also possible to incorporate soil amendments before the spears emerge in the early spring, based on the soil test and recommendations. However, if there is a very wet spring, it may be prohibited to fertilize before spear emergence, as delaying cultivation can damage the spears. Therefore, it is important to assess the weather conditions and adjust your fertilization strategy accordingly.
Fertilizing asparagus is a critical process to ensure healthy plant growth and abundant harvests. By incorporating nutrients prior to planting, performing fall or spring tillage, adding compost and manure, applying phosphate at planting, adjusting fertilizer application based on soil tests, and implementing appropriate fertilization strategies for different growth stages, you can provide the necessary nutrients for asparagus plants and promote optimal growth and productivity. Remember to always consult soil test reports and follow recommended guidelines for best results.
Frequently Asked Questions
What is the best fertilizer for asparagus?
When it comes to fertilizing asparagus, the best choice would be a high potassium general fertilizer, such as Vitax Q4. A rate of two handfuls per square meter or yard should be applied in early spring. In case the growth appears weak during spring, it is recommended to repeat this application once the harvesting season concludes. This will ensure that the asparagus receives the necessary nutrients to thrive and produce a bountiful harvest.
What is the NPK ratio for asparagus?
Asparagus, being a nutrient-hungry plant, benefits from balanced fertilization. In the absence of a soil test report, it is recommended to use a 10-10-10 fertilizer, which contains 10% nitrogen, 10% phosphorus, and 10% potassium. This balanced NPK ratio provides the necessary nutrients for healthy asparagus growth and development. Applying 1 to 1.5 pounds of 10-10-10 fertilizer per 100 square feet before planting can support optimal nutrient levels in the soil, ensuring favorable conditions for asparagus to thrive.
What kind of fertilizer for asparagus ferns?
To nourish asparagus ferns, it is crucial to choose a fertilizer that provides balanced nutrients while accommodating their preferred humid conditions. Opt for a water-soluble, all-purpose fertilizer specifically designed for ferns and indoor plants. Dilute the fertilizer to half strength and apply it once a month during spring and summer. This will ensure that the fern receives the necessary nutrients to thrive in its ideal temperature range of 60–80 °F. Remember, maintaining a humid environment and regular misting will complement the fertilizer’s effectiveness, keeping your asparagus fern green and healthy.
Does asparagus like a lot of nitrogen?
Asparagus, being an established crop, does benefit from a moderate amount of nitrogen. While timing and specific quantities may vary, it is generally recommended to maintain nitrogen levels between 100 to 150 lb per acre for optimal yield. However, excessive nitrogen application can lead to excessive foliage growth at the expense of asparagus production, so it is important to find a balance in fertilization practices. By applying phosphorous and potassium before harvest and maintaining moderate nitrogen levels, asparagus can thrive and yield satisfying results.