Seaweed vs Kelp Fertilizer

Seaweed vs Kelp Fertilizer: Which One Should You Choose?

Due to their natural and organic properties, seaweed vs kelp fertilizers has become increasingly popular in recent years. Both are derived from marine plants and provide various benefits for plants, including improved growth, increased resilience, and enhanced nutrient uptake. However, many gardeners are still unsure about their differences and which is best for their plants.

Seaweed fertilizer is made from brown or red seaweed and is often available in liquid or powder form. It contains a range of micronutrients, including iron, zinc, manganese, and plant hormones that stimulate growth and development.

Kelp fertilizer, on the other hand, is made from kelp or seaweed that grows on rocky coastlines and is typically available in liquid form. It is known for its high levels of potassium, which is essential for plant growth and development, as well as other minerals like magnesium and iron.

When it comes to choosing between seaweed and kelp fertilizer, it ultimately depends on the specific needs of the plants being grown. While both offer a range of benefits, seaweed fertilizer may be better suited for plants that require a boost in micronutrients, while kelp fertilizer may be better for those that require higher potassium levels.

Gardeners should also consider factors such as soil type, climate, and the specific plants being grown when making their decision.

Understanding Seaweed and Kelp

Seaweed vs Kelp FertilizerSeaweed and kelp are two types of marine algae that are commonly used as fertilizers for plants. While they are similar in many ways, there are some key differences between them that are important to understand.

Seaweed

Seaweed is a type of marine algae that can be found in many different varieties, including brown seaweed and red seaweed. It is typically harvested from the ocean and then processed into a liquid or powder form that can be used as a natural fertilizer for many houseplants.

Seaweed is known for its high concentration of nutrients, including nitrogen, phosphorus, and potassium. It also contains a range of trace minerals that can benefit plant growth. In addition, seaweed contains natural growth hormones that can help to stimulate plant growth and improve overall plant health.

Kelp

Kelp is a type of seaweed that is commonly found in colder waters. It is typically harvested from rocky coastlines and then processed into a powder or liquid form that can be used as a plant fertilizer.

Like seaweed, kelp is rich in nutrients and trace minerals that can benefit plant growth. However, kelp is known to have higher levels of potassium than seaweed, which can be particularly beneficial for plants growing in soil deficient in this nutrient.

In addition to its nutrient content, kelp also contains a range of natural growth hormones that can help to stimulate plant growth and improve overall plant health.

The Basics of Fertilizers

Fertilizers are substances that are added to soil to improve its fertility and promote plant growth. They are often used in agriculture, gardening, and landscaping to ensure that plants can access the essential nutrients they need to thrive.

Various types of fertilizers are available, including natural, organic, and NPK fertilizers. Natural and organic fertilizers are derived from natural sources such as animal manure, fish emulsion, compost, and plant matter. They are often preferred by gardeners who want to avoid using synthetic chemicals in their gardens.

NPK fertilizers, on the other hand, are synthetic fertilizers that contain a combination of nitrogen, phosphorus, and potassium. These three nutrients are essential for plant growth and are often lacking in standard garden soil. NPK fertilizers are designed to give plants a quick boost of these essential nutrients.

When choosing a fertilizer, it is crucial to consider the specific needs of the plants you are growing. Different plants require different nutrients; some may require more or less fertilizer than others. It is also essential to consider the type of soil you are working with, as some soils may be deficient in specific nutrients.

Seaweed Fertilizer

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Seaweed fertilizer is a type of organic fertilizer that is made from seaweed. It is rich in nutrients and minerals that are essential for plant growth and development. Seaweed fertilizer is available in liquid and powder form, with liquid seaweed extract being the most common.

One of the benefits of using seaweed fertilizer is that it is a natural and organic option for gardeners who want to avoid synthetic fertilizers. Seaweed fertilizer is also rich in micronutrients such as calcium, magnesium, copper, iron, sulfur, manganese, and zinc. These micronutrients are essential for healthy plant growth and can help improve soil health.

Seaweed powder is another form of seaweed fertilizer that can be used in gardens. It is made by drying and grinding seaweed into a fine powder. Seaweed powder can be used as a soil amendment to improve soil structure and fertility. It can also be used as a foliar spray to provide nutrients directly to the leaves of plants.

Overall, seaweed fertilizer is a great option for gardeners who want to use natural and organic fertilizers. It is rich in nutrients and micronutrients that are essential for plant growth and can help improve soil health. Whether you choose liquid seaweed extract or seaweed powder, seaweed fertilizer is an excellent addition to any garden.

Kelp Fertilizer

Organic Liquid Kelp Fertilizer - Quart (32 oz)
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Kelp fertilizer is a type of organic fertilizer that is derived from kelp, a type of seaweed that grows along rocky coastlines. Kelp fertilizer is available in various forms, including kelp meal fertilizer, liquid kelp fertilizer, and kelp powder.

Kelp is known to contain a wide range of essential nutrients that are beneficial for plant growth, including nitrogen, phosphorus, and potassium. In fact, kelp is particularly rich in potassium, which is an essential nutrient that plants need for healthy growth and development.

One of the benefits of using kelp fertilizer is that it is a natural and organic fertilizer that is free from harmful chemicals and synthetic additives. This makes it a great choice for gardeners who are looking for a more sustainable and eco-friendly way to fertilize their plants.

Kelp fertilizer is also known to be beneficial for improving soil health. The nutrients in kelp can help improve soil structure and increase soil fertility, leading to healthier and more productive plants.

Overall, kelp fertilizer is an excellent choice for gardeners who are looking for a natural and organic way to fertilize their plants. Whether you choose kelp meal fertilizer, liquid kelp fertilizer, or kelp powder, you can confidently provide your plants with the essential nutrients they need for healthy growth and development.

Nutrient Content

Regarding nutrient content, both seaweed and kelp fertilizers are rich in essential nutrients that plants need to thrive. However, there are some differences in the types and amounts of nutrients they contain.

Seaweed fertilizer is typically rich in nitrogen, phosphorus, and potassium, which are the primary macronutrients that plants need in large quantities. It also contains a range of micronutrients, including calcium, magnesium, iron, and trace elements essential for plant growth and development.

On the other hand, kelp fertilizer tends to be higher in overall nutrients than seaweed fertilizer. It is particularly rich in potassium, which is important for plant growth and stress tolerance. It also contains many other essential nutrients, including nitrogen, phosphorus, calcium, and trace minerals.

Both seaweed and kelp fertilizers are also rich in vitamins and carbohydrates, which can help to improve soil health and promote healthy plant growth. Additionally, they are both natural sources of growth hormones, which can help to stimulate plant growth and improve plant health.

Benefits for Plants

Seaweed and KelpSeaweed and kelp fertilizers are great options for plants, both indoors and outdoors. Both types of fertilizers are rich in essential nutrients that plants need to grow and thrive.

Plant Growth

Seaweed and kelp fertilizers can help stimulate plant growth. They contain natural plant hormones, such as auxins, cytokinins, and gibberellins, which promote cell division and elongation, resulting in faster growth rates. These hormones also help plants resist stress, such as drought and extreme temperatures.

Root Growth

Seaweed and kelp fertilizers can also improve root growth. They contain natural growth stimulants that encourage root development, resulting in stronger and healthier plants. Stronger roots can also help plants better absorb water and nutrients from the soil.

Photosynthesis

Seaweed and kelp fertilizers can also enhance photosynthesis, the process by which plants convert light energy into chemical energy. They contain a range of micronutrients, such as iron, magnesium, and zinc, which are essential for chlorophyll production. Chlorophyll is the pigment that gives plants their green color, and it is vital for photosynthesis.

Soil Structure

Seaweed and kelp fertilizers can improve soil structure. They contain organic matter, which can help to improve soil texture and water-holding capacity. Organic matter can also help to create a favorable environment for beneficial soil microorganisms, which can help to break down organic matter and release nutrients to plants.

In summary, seaweed and kelp fertilizers are great options for plants. They contain essential nutrients that can help to stimulate plant growth, improve root development, enhance photosynthesis, and improve soil structure.

Using seaweed and kelp fertilizers can help promote healthier and more productive indoor and outdoor plants.

Seaweed vs Kelp Fertilizer

Seaweed and kelp fertilizers are both natural and organic fertilizers that can be used to enhance the growth of plants. They are derived from different types of marine algae and have their own unique characteristics.

Difference Between Seaweed and Kelp Fertilizer

The main difference between seaweed and kelp fertilizer lies in the type of algae they are derived from. Seaweed fertilizer is derived from brown or red seaweed, while kelp fertilizer is derived from kelp or seaweed that grows on rocky coastlines. While both types of fertilizers provide nutrients to plants, kelp tends to be higher in overall nutrients.

Comparison of Nutrients

Kelp fertilizer contains a higher concentration of potassium, which is essential for plant growth and development. Seaweed fertilizer, on the other hand, contains a higher concentration of nitrogen, which is necessary for the growth of leaves and stems. Both types of fertilizers also contain trace elements such as iron, zinc, and magnesium that are essential for plant growth.

Benefits of Seaweed and Kelp Fertilizers

Seaweed and kelp fertilizers are both natural and organic, making them a great alternative to synthetic fertilizers. They provide a slow-release of nutrients that can improve soil quality and enhance plant growth. Additionally, they can improve the plant’s resistance to pests and diseases.

Both seaweed and kelp fertilizers are great options for those looking for natural and organic ways to improve plant growth. The choice between the two will depend on the specific needs of the plant and the type of nutrients required.

Application Methods

During the growing season, seaweed and kelp fertilizers can be applied to plants in various ways, depending on the type of fertilizer and the plant’s needs. Here are some standard application methods:

Garden Fertilizer

Seaweed and kelp fertilizers are often used as garden fertilizers. They can be applied directly to the soil around plants or mixed with water and used to water plants. Liquid seaweed and kelp fertilizers are particularly useful for garden plants because they are easy to apply and can be absorbed quickly.

Foliar Spray

Seaweed and kelp fertilizers can also be used as foliar sprays. Foliar sprays are applied directly to the leaves of plants and are absorbed through the leaves. This method is particularly useful for plants with poor root systems or not growing well. Foliar sprays can also be used to supplement soil applications.

Liquid Fertilizer

Liquid seaweed fertilizer and kelp fertilizers are the most common type of fertilizer available. They are easy to apply and can be absorbed by plants quickly. Liquid fertilizers are often used as garden fertilizers, but they can also be used as foliar sprays.

Powder

Kelp meal fertilizer is a type of dry fertilizer that comes in a powder form. It can be mixed with water and used as a liquid fertilizer or applied directly to the soil. Kelp meal fertilizer is slow-release, meaning that it releases nutrients slowly over time. This makes it a good choice for plants that require a steady supply of nutrients.

Water

Seaweed and kelp fertilizers can also be applied through irrigation systems. This is a good option for large-scale operations or for plants that require a lot of water. Seaweed and kelp fertilizers can be mixed with water and applied through drip irrigation systems or sprinklers.

In conclusion, the application method used for seaweed and kelp fertilizers will depend on the type of fertilizer and the plant’s needs. Liquid fertilizers are easy to apply and can be absorbed quickly, while kelp meal fertilizers are slow-release and provide a steady supply of nutrients over time.

Foliar sprays are useful for plants with poor root systems, and irrigation systems are a good option for large-scale operations.

Which Seaweed extract is best for plants?

The “best” seaweed extract for plants can depend on various factors, including the type of plants you are growing, your specific soil conditions, and your intended use.

Different seaweed species and extraction methods can yield varying nutrient profiles and concentrations. However, some common seaweed species used for making seaweed extract include Ascophyllum nodosum, Ecklonia maxima, and Sargassum.

Here are some factors to consider when choosing a seaweed extract:

  1. Source of Seaweed: Look for reputable brands that source their seaweed from clean, unpolluted waters. The quality of the seaweed used in the extraction process can significantly impact the nutrient content of the final product.
  2. Extraction Method: The method used to extract the seaweed’s beneficial compounds can affect the nutrient content and overall effectiveness of the seaweed extract. Cold-pressing and enzymatic digestion are common gentle extraction methods that preserve more of the seaweed’s natural goodness.
  3. Concentration: Check the concentration of the seaweed extract. Some products are more concentrated than others, and you may need to dilute them before application to avoid over-fertilization.
  4. Nutrient Content: While seaweed extract is not a complete fertilizer, it should contain various beneficial elements such as plant hormones, trace minerals, vitamins, and amino acids. These components can promote plant growth and improve overall plant health.
  5. Application Method: Consider the application method you prefer – liquid seaweed extract can be applied as a foliar spray or root drench, while powdered forms may be incorporated directly into the soil.
  6. Compatibility: Ensure the seaweed extract matches your chosen plants and gardening practices. Some seaweed extracts may be more suitable for specific plant types or growth stages.
  7. Organic Certification: If you’re looking for an organic option, check if the seaweed extract is certified organic and complies with organic farming standards.
Seaweed Extract for Plants by Marine Magic | 100% Organic Seaweed Fertilizer
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What plants like seaweed fertilizer?

Seaweed fertilizer is beneficial for a wide range of plants, both in the garden and indoors. Its nutrient-rich composition and various growth-promoting compounds make it suitable for many plant species. Here are some types of plants that tend to respond well to seaweed fertilizer:

  1. Vegetables: Seaweed fertilizer can benefit a variety of vegetables, including tomatoes, peppers, cucumbers, lettuce, spinach, and broccoli. The nutrients in seaweed extract support healthy growth, flowering, and fruit development.
  2. Fruits: Fruit-bearing plants like strawberries, blueberries, raspberries, and citrus trees can benefit from the boost of nutrients and hormones provided by seaweed fertilizer.
  3. Herbs: Popular herbs like basil, parsley, cilantro, and mint often respond positively to seaweed fertilizers, resulting in increased aromatic and flavorful leaves.
  4. Flowers: Seaweed fertilizer can enhance the growth and bloom of many flowering plants, such as roses, marigolds, petunias, geraniums, and sunflowers.
  5. Houseplants: Indoor plants, including tropical foliage plants, ferns, and flowering houseplants, can thrive with the application of seaweed extract, improving their overall health and vitality.
  6. Ornamental Shrubs: Seaweed fertilizer can be beneficial for various ornamental shrubs, such as azaleas, camellias, and hydrangeas, helping them produce vibrant flowers and lush foliage.
  7. Lawn Grass: Seaweed fertilizer can be used as a soil conditioner for lawns, helping to improve soil structure, encourage root growth, and enhance the overall health of the grass.
  8. Trees: Many trees, including fruit trees like apple, pear, and peach, as well as ornamental trees, can benefit from the nutrients and growth stimulants in seaweed fertilizer.

It’s essential to note that while seaweed fertilizer can benefit a wide range of plants, it is generally used as a supplement rather than a complete fertilizer. It complements traditional NPK (nitrogen, phosphorus, potassium) fertilizers by providing additional micronutrients, hormones, and trace elements that support overall plant health and resilience.

When using seaweed fertilizer, always follow the manufacturer’s recommended application rates and frequency. Even with natural products like seaweed extract, over-fertilization can lead to nutrient imbalances and potential harm to plants. Always observe your plants’ responses to fertilization and adjust the application as needed.

Environmental Impact

Seaweed HarvestSeaweed and kelp fertilizers are both considered to be sustainable and renewable resources. They are harvested from the ocean, which means there is no need for land use, freshwater, or pesticides. Additionally, both seaweed and kelp are non-toxic and do not harm the environment when used properly.

However, there are some concerns regarding the environmental impact of seaweed and kelp harvesting. The process of harvesting and manufacturing seaweed and kelp can have negative impacts on the ecosystem if not done sustainably.

Harvesting seaweed and kelp can lead to the removal of important habitat for marine life, such as fish and invertebrates. It can also disrupt the natural balance of the ecosystem, leading to a decrease in biodiversity.

To mitigate these negative impacts, it is important to ensure that seaweed and kelp harvesting is done sustainably. This can include limiting the amount of seaweed and kelp harvested in a particular area and ensuring that the harvesting process does not damage the surrounding ecosystem.

One company that is committed to sustainable seaweed farming is Kelp Blue. Their farming practices are designed to “re-wild” the ocean and capture millions of tonnes of CO2 annually by 2050. They do not use fertilizers, pesticides, freshwater, or land in their production processes, making their farming practices eco-friendly.

In conclusion, while seaweed and kelp fertilizers are generally considered to be sustainable and renewable resources, it is important to ensure that they are harvested and manufactured in an environmentally responsible manner. By doing so, we can minimize the negative impact on the ecosystem and ensure that these resources continue to be available for future generations.

Availability and Purchase Options

Seaweed and kelp fertilizers are becoming increasingly popular among gardeners who prefer natural, organic options. These fertilizers are widely available and can be purchased at local garden centers, online retailers, and through various other channels.

Local garden centers are a great place to start when looking for seaweed and kelp fertilizers. Most garden centers carry a range of organic fertilizers, including seaweed and kelp-based products. These fertilizers are often available in liquid or granular form, and can be used for a variety of plants.

Online retailers such as Amazon also offer a wide range of seaweed and kelp fertilizers. These products are often available in larger quantities and can be shipped directly to the buyer’s doorstep.

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When purchasing from online retailers, it is important to read reviews and check the seller’s reputation to ensure that the product is of high quality.

When it comes to garden fertilizers, there are many options available on the market. Seaweed and kelp-based fertilizers are just one type of organic fertilizer that can be used to promote healthy plant growth.

These fertilizers are often rich in essential nutrients such as nitrogen, phosphorus, and potassium, which are important for plant growth and development.

Frequently Asked Questions

Q: What are the benefits of using seaweed or kelp as fertilizer?

A: Seaweed and kelp are both excellent sources of nutrients for plants. They contain a range of micronutrients, trace elements, and growth hormones that can improve plant health and increase crop yields. Seaweed and kelp fertilizers can also help to improve soil structure and water retention, making them ideal for dry or sandy soils.

Q: How does kelp fertilizer differ from other types of organic fertilizers?

A: Kelp fertilizer is unique in that it contains high levels of potassium, which is essential for plant growth and development. It also contains a range of other nutrients, including nitrogen, phosphorus, and trace elements, which can help to improve soil fertility and promote healthy plant growth. Unlike some other types of organic fertilizers, kelp fertilizer is also low in salts, making it safe to use on a wide range of plants.

Q: What is the recommended application rate for seaweed or kelp fertilizer?

A: The recommended application rate for seaweed or kelp fertilizer will depend on the type of plant you are growing and the condition of your soil. As a general rule, it is best to start with a small amount and gradually increase the dose over time. Most seaweed and kelp fertilizers come with specific application instructions, so be sure to read the label carefully before use.

Q: Are there any environmental concerns associated with using seaweed or kelp as fertilizer?

A: Seaweed and kelp fertilizers are generally considered safe and environmentally friendly. They are derived from renewable resources and do not contain harmful chemicals or synthetic additives. However, it is important to use these fertilizers responsibly and avoid over-application, as excessive use can lead to nutrient runoff and harm local waterways.

Q: Can seaweed or kelp fertilizer be used on all types of plants?

A: Seaweed and kelp fertilizers can be used on various plants, including vegetables, fruits, flowers, and ornamental plants. However, it is essential to choose a fertilizer that is specifically formulated for your plant type and follow the application instructions carefully.

Q: What is the shelf life of seaweed or kelp fertilizer?

A: The shelf life of kelp or seaweed fertiliser will depend on the specific product and the storage conditions. Most seaweed and kelp fertilizers generally have a shelf life of 1-2 years if stored in a cool, dry place. Be sure to check the label for specific storage instructions and expiration dates.

Q: What is the difference between seaweed and kelp?

A: Seaweed and kelp are both types of marine algae but belong to different groups. Seaweed is a general term for various types of marine algae, while kelp refers to large brown algae belonging to the Laminariales order.

Q: What is kelp meal?

A: Kelp meal is a type of fertilizer made from dried and ground kelp seaweed. It is rich in nutrients and minerals, making it a valuable organic amendment for soil enrichment.

Q: What is seaweed extract?

A: Seaweed extract is a liquid fertilizer derived from seaweed. It is typically obtained by processing seaweed through various methods like cold-pressing or enzymatic digestion to extract the beneficial compounds.

Q: What is the difference between kelp meal and seaweed extract?

A: The main differences lie in their form and concentration. Kelp meal is a solid, dry fertilizer, whereas seaweed extract is a liquid concentrate. Kelp meal provides a slower release of nutrients over time, while seaweed extract offers quick absorption by plants when applied as a foliar spray or root drench.

Q: Can you over-fertilize with kelp?

A: Yes, it is possible to over-fertilize with kelp, just like with any other fertilizer. While kelp is generally considered safe and low in the risk of burning plants, excessive application can lead to nutrient imbalances in the soil or water. Always follow the recommended dosage on the product label and avoid applying more than needed.

Q: Is seaweed extract a complete fertilizer?

A: Seaweed extract is a valuable fertilizer but not a complete fertilizer in the traditional sense. It contains various beneficial elements like plant hormones, trace minerals, vitamins, and amino acids that promote plant growth and health.

However, it lacks a substantial amount of primary nutrients like nitrogen (N), phosphorus (P), and potassium (K). Therefore, it is often used to supplement traditional fertilizers rather than a standalone complete fertilizer.

When using seaweed extract, it is essential to ensure that your plants receive adequate amounts of NPK and other essential nutrients through other means.

Q: Is kelp fertilizer high in nitrogen?

A: Kelp fertilizer typically contains a moderate amount of nitrogen, but the exact nitrogen content can vary depending on the specific product and the kelp processing method. Like other seaweeds, Kelp naturally contains nitrogen and other essential nutrients like phosphorus, potassium, calcium, magnesium, and various micronutrients.

The nitrogen content in kelp fertilizer is usually lower than that of traditional nitrogen-focused fertilizers like urea or ammonium nitrate. This makes kelp fertilizer a more balanced option, especially for organic gardening, as it provides not only nitrogen but also a range of other beneficial nutrients that support plant growth and health.

Kelp meal, which is made from dried and ground kelp seaweed, typically contains around 1-2% nitrogen by weight. On the other hand, liquid seaweed extract, which is also derived from kelp, may have a slightly lower nitrogen content, usually ranging from 0.1% to 1% nitrogen.

While kelp fertilizer is not a high-nitrogen fertilizer, it offers several advantages, including improved soil structure, enhanced nutrient uptake, increased tolerance to environmental stresses, and better overall plant health. Additionally, the natural growth hormones present in kelp can promote root development, seed germination, and flowering, making it a valuable supplement to traditional nitrogen fertilizers in the overall nutrient management strategy for gardening and agriculture.

Q: What is the difference between kelp and fish fertilizer?

A: The main difference between kelp (seaweed) fertilizer and fish fertilizer is their sources and nutrient compositions. Both are organic fertilizers derived from natural sources, but they have distinct properties and provide different benefits to plants.

Kelp (Seaweed) Fertilizer:

  • Source: Kelp fertilizer is derived from a type of brown seaweed, such as Ascophyllum nodosum and Ecklonia maxima.
  • Nutrient Composition: Kelp fertilizer is rich in essential nutrients like nitrogen, phosphorus, potassium, calcium, magnesium, and trace elements. It also contains natural growth hormones (auxins, cytokinins, and gibberellins) that promote plant growth and development.
  • Benefits: Kelp fertilizer improves soil structure and fertility, enhances nutrient uptake, stimulates root growth, increases resistance to environmental stresses, and promotes overall plant health. It is a well-balanced organic fertilizer that benefits a wide range of plants.

Fish Fertilizer:

  • Source: Fish fertilizer is made from fish byproducts like fish emulsion or fish meal. It is derived from the remains of processed fish, including bones, skin, and internal organs.
  • Nutrient Composition: Fish fertilizer is typically high in nitrogen, phosphorus, and essential amino acids. The nitrogen content is usually the primary focus, with levels ranging from 5% to 10% or more.
  • Benefits: Fish fertilizer provides a quick-release source of nitrogen, which stimulates rapid leafy growth in plants. It is particularly useful for promoting green foliage and can be beneficial for leafy vegetables, lawns, and plants that require a nitrogen boost.

In summary, kelp (seaweed) fertilizer is a more balanced organic fertilizer that offers a range of nutrients, growth hormones, and trace elements. It benefits overall plant health, root development, and stress resistance.

On the other hand, fish fertilizer is focused on providing a rapid source of nitrogen, which primarily promotes vegetative growth.

Depending on your gardening needs and the specific requirements of your plants, you can choose between these organic fertilizers or even use them together to create a well-rounded nutrient management approach.

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