Understanding Granular Fertilizers: How They Work and Best Uses

Fertilizing is an essential part of garden care for growers. With the right fertilizing, they can achieve several benefits, including growing lush green grasses, extensive root development, plant resistance to diseases and pest attacks, and plants withstanding certain stresses. Such green spaces welcome habitats to a huge variety of flora and fauna, thus ensuring a healthy ecosystem.

Fertilizers are prepared considering the different requirements of soil and plants. They may come in liquid, granular, or powdered form, with varying NPK ratios and different nutrient release rates. Some fertilizers are also prepared to work as herbicides, significantly reducing soil chemical applications. Growers must choose the one that can benefit the soil to the maximum. 

Granular fertilizers are nutrients containing dry granules that target different types of plant issues a garden or growing area may face. They come in different NPK ratios and varying concentrations of micronutrients and impact the plants differently in different seasons. One key aspect of this fertilizer is its controlled-release nutrients, which make it stay in the soil for a long time. Growcycle is the best choice for growers who want to renew their neglected lands into green spaces. They can find a wide range of gardening equipment, plant fertilizers, weed and pest control solutions, and more here.

What are Granular Fertilizers?

Granular fertilizers are one of the most important types of fertilizer. They are dry, solid, and granular and contain essential nutrients to fulfill the soil’s nutrient requirements. Granular fertilizers may be controlled-release or water-soluble. 

In controlled-release fertilizers, nutrients are released gradually for a more extended period. This type of granular fertilizer is usually suitable before plants go dormant to ensure a consistent nutrient supply. 

In water-soluble granular fertilizers, nutrients are readily available to the soil and plants. Such fertilizers are effective during the growing season, in newly established green spaces, or while growing new plants. 

The significant macronutrients in granular fertilizers are:

• Nitrogen
• Potassium
• Phosphorus

Their concentration may vary depending on the specific requirements of the soil, plant types, and the season in which plants are being fertilized. The notable micronutrients found in granular fertilizers are iron, manganese, copper, zinc, calcium, and sulfur. Overall, granular fertilizers are an effective choice for growers seeking to fertilize their gardens and lawns.

Granular Fertilizers vs. Liquid Fertilizers

Granular fertilizers are known for their slow release of nutrients. They break down gradually, providing plants with a steady supply of nutrients over time. This slow-release feature means growers don't have to apply them as often, making them a convenient option for many gardeners. Applying granular fertilizers is easy.

Gardeners can spread them evenly over the soil, which is especially useful for larger gardens. They are a popular option for people who require efficient coverage of a large area due to their ease of use. Granular fertilizers have a long-lasting effect. Since they release nutrients slowly, they can last longer and may be more cost-effective in the long run. This can greatly benefit gardeners looking to maximize their budget while still providing their plants with essential nutrients.

Liquid fertilizers are absorbed by plants quickly, giving them an immediate boost of nutrients. This rapid absorption is ideal when plants need a quick pick-me-up or show signs of nutrient deficiency. Gardeners can apply them precisely, ensuring each plant meets its needs. This precision is particularly helpful for gardeners who want to tailor their feeding practices to the specific requirements of different plants.

Liquid fertilizers are also versatile. They can be used in various ways, such as foliar feeding, where the fertilizer is sprayed directly onto the leaves. This method allows plants to take in nutrients quickly through their foliage, which can be especially beneficial during certain growth stages or when quick nutrient uptake is necessary.

Ideal Uses of Granular Fertilizer

Growers prefer using granular fertilizers in gardening and agriculture due to their versatile nutrient content and convenient application. It can be used at all levels, including home lawns, indoor plants, container plants, large yards, outdoor vegetable and fruit gardens, evergreen trees, and agricultural lands. 

• Growers who want to maintain lush, green, and healthy lawns in their homes can apply granular fertilizer. A drop or broadcast spreader is an ideal option for this purpose. 
• Granular fertilizer helps feed indoor and container plants, as growers may add the required amount to the top layer. Adequately watered soil then helps in the effective absorption of nutrients and feeds the plants for a considerable time. 
• In gardens, growers apply granular fertilizers to evergreen trees just below the extended branches, allowing nutrients to penetrate the soil and feed the roots. For older and sizable trees, a spreader can be used for uniform distribution of granules, but manually fertilizing small trees is recommended.  
• Growers may use granular fertilizers to feed plants in outdoor yards or vegetable gardens. Applying them during the growing period with a suitable spreader results in a vibrant and healthy lawn.  
• Agricultural lands can have the best yield in terms of both quality and quantity when given considerable granular fertilizers. The controlled-release granules ensure nutrient presence in the soil for a long time, thus preventing the time and labor of the farmers. Farmers may apply the granules in the field with a large tractor-mounted spreader or via fertigation by mixing water-soluble granular fertilizer with water. 

How to Feed Plants With Granular Fertilizers?

Granular fertilizers are a great way to provide plants with the nutrients they need over a longer period. Here’s a step-by-step guide on how to use them effectively:

1. Prepare the Soil for Fertilizing

After a harsh winter or blazing summer, the soil may need some time to recover from the stress. It is not recommended to apply fertilizer directly to such soils. Instead, growers should wait to let the soil recover from the weather stress.

Trimming the overgrown plants and grasses is good for letting the oil absorb maximum nutrients, as its accumulation in the soil is harmful. If required, adequately water the soil, as dry soils can not absorb fertilizers.  

2. Assess the Required Amounts

Growers should consider the amounts the soil requires via the soil test. This amount may also differ based on the type of plants and the season in which soil is being fertilized.

Growers need to consider the instructions mentioned on the fertilizer’s packaging as they also help to determine what amount of fertilizer is enough for a given area. Applying the granules in excess amounts may immediately cause the nutrient burn to the plants.

3. Choose the Right Granular Fertilizer

Selecting the right granular fertilizer is essential to provide plants with the necessary nutrients for healthy growth. One excellent option is the CME Stonington Granular Fertilizer Lobster Kelp. This fertilizer is made from lobster and kelp, offering a rich blend of organic materials that promote robust root development and maintain soil health. It is particularly beneficial for improving soil structure and providing a slow release of nutrients over time, ensuring that plants receive a steady supply of essential elements.

Another great choice is the Arber All Purpose Granular Fertilizer. This versatile fertilizer is designed to meet the needs of a wide range of plants, making it ideal for general garden use. It provides a balanced mix of nutrients, promoting overall plant health and vigorous growth.

Jobes 16# Organic All Purpose Granular Fertilizer is also a great option for those looking for an organic solution. This fertilizer is made from natural ingredients and is perfect for gardeners who prefer sustainable practices. It delivers a comprehensive range of nutrients that support healthy plant development and improve soil fertility.

3. Evenly Apply the Fertilizer

Growers should apply the fertilizer granules evenly on the ground. Unevenly spread fertilizer causes missed spots, leaving unfertilized patches on the ground. To ensure uniform distribution, growers may choose a suitable fertilizer spreader from the various fertilizer spreaders.

For large gardens, growers may consider a broadcast spreader as they evenly apply the granules to greater distances. Meanwhile, a drop spreader can effectively fertilize the smaller and confined spaces. It applies the fertilizer just below the area under the spreader, making it a great fit for narrow spaces.  

4. Focus on the Roots 

To make sure the fertilizer gets into the roots as efficiently as possible, growers should apply the fertilizer directly to the soil. Roots require fertilizer the most, as they are responsible for almost all of the plant's crucial functions.

Fertilizer applied to the leaves or stems of plants may cause them to burn. If applied mistakenly, growers should immediately remove the granules from vegetative parts to prevent nutrient burn and plant damage. 

5. Ensure Rake and Gentle Watering 

After effectively applying the fertilizers to the soil, growers need to rake the soil gently to let the fertilizer reach the roots. Also, applying gentle splashes of water helps the granules absorb the fertilizer into the soil effectively.

Growers should make the fertilizer granules reach at least 1-2 inches into the soil to allow its interaction with the root system in a better way. Effectively absorbed fertilizer works best in plant growth and development. 

6. Reapply the Fertilizer Timely

Growers are advised to regularly follow up on the fertilized space to monitor plant growth. If necessary, consider reapplying the fertilizer after a certain time. Generally, growers may go for reapplication after 4 to 6 weeks, but it may depend on several factors. These factors notably include fertilizer type, type of plants being fertilized, nutrient level in the soil, and weather conditions.

Precautions for Growers while Applying Granular Fertilizers 

Following are some preventive measures growers should consider for granular fertilizer application;

• Growers should prioritize personal safety while applying fertilizers to the soil. Wear a mask and gloves, as fertilizer granules can harm dermal contact and inhalation. 
• While filling the granules in the spreader, growers should not let it overfill as it may cause trouble during application.
• A gentle stirring of granules is recommended after filling the spreader to determine the clump formation. 
• Granular fertilizer should be stored in a dry space, as humidity can cause it to form clumps. 
• Growers must thoroughly understand the instructions on the fertilizer packaging before applying them, as ignoring them may cause inconveniences later. 
• Fertilizers should never be applied in amounts greater than necessary. Instead, depending on the area and instructed limit, growers should spread it very evenly.
• Granules can wash away in rainstorms, and heavy winds may lift them off the ground, so growers need to consider the weather forecast. They should also not apply it in extreme heat. Early morning or afternoon are the best times of the day for granular fertilizer application.

Effective Times to Apply Granular Fertilizers

Effective time is a crucial factor for growers while considering the fertilizer application to the soils. Fertilizing at times when it is not recommended brings more harm than benefits to the soil and the plants. For applying different types of granular fertilizers, the following are some good time frames when growers may opt for fertilizing the soils;

Before or During the Plantation? 

The soil may require enough nutrients to nurture the plants before seeding or at the time of growth. Feeding the soil with fast-release granular fertilizer effectively supports a healthy green space resilient to specific external stresses. Before the plant grows, adding sufficient nutrients to the soil helps retain moisture and develops stronger plants. 

Before Winter Dormancy

Before going dormant, plants need fertilizers with little to no nitrogen content, as vegetative growth is not good during colder months. Higher potassium fertilizers are preferable in the controlled-release formulation. This helps the plants withstand winter stress and build stronger roots to combat harsh winters, and the slow-release nutrients help feed the plants throughout winters when fertilizer is not being applied anymore.  

During Fall

After the garden or lawn has survived the scorching summer temperatures, it needs an adequate supply of nutrients to appear lush, green, and healthy. So, fall is the best season for applying fertilizers in granular form. Fertilizers with higher potassium and phosphorus content are good during fall as they help build plants with extensive root development and disease resistance.

In the Growing Season

The growing season requires adequate fertilizing to help plants thrive. After the dormant state is over, plants need enough nutrients to begin growing. Moreover, plant growth is at its peak during early summer.

During such seasons, growers should use fertilizers containing all the macronutrients with a high nitrogen content. This higher nitrogen ensures good vegetative growth with denser, thicker, and lush green spaces. In addition to nitrogen, phosphorus, and potassium, the fertilizer should also contain necessary micronutrients.

How Long Does Granular Fertilizers Take to Dissolve in the Soil?

Granular fertilizers are absorbed into the soil mainly when the applied granules get adequate water. Due to the moisture content, granular particles start breaking down, and the nutrients within the granules start mixing with the water. Usually, it takes 24 to 48 hours for the granular fertilizers to dissolve in the soil, but it depends on certain conditions. 

The type of fertilizer is important when considering the time it will take to dissolve. Due to their water-soluble nature, fast-release fertilizers will dissolve relatively quickly in the soil. They normally take 1 to 2 weeks to show effective results. Controlled-release fertilizers may contain sulfur that lets the nutrients release slowly into the water. Growers may notice the results of slow-release fertilizers after about 4 to 6 weeks. 

Growers may save themselves from the hassle of frequent reapplication by applying controlled-release fertilizer, which will ensure a long-term nutrient supply. The dissolution time of the granules is also influenced by temperature, soil moisture, microbial activity, and certain environmental conditions. 

Benefits of Using Granular Fertilizers to Boost Plant Health

Here are some of the benefits of using granular fertilizers in lawns, gardens, and agricultural lands:

1. Eco-friendly Choice

Granular fertilizers are a good option for growers who are concerned about the environment. If applied following the proper practices, they help reduce nutrients flowing into nearby water bodies, thus preventing water pollution. Moreover, the increased soil health retains good moisture and nutrient content, reducing the chances of soil erosion. This healthy soil ensures a stable structure of the green space and develops a nurturing ecosystem. Also, the slow-released formulation prevents reapplications, thus limiting fuel consumption.

2. A Step to Sustainable Agriculture

Farmers using granular fertilizers on their fields can be a step ahead in adapting sustainable agriculture practices in many ways. Using the right nutrient ratio helps produce more productive and flavorful crops. When applied correctly, they increase crop yields while reducing the need for chemical interventions. The high potassium fertilizers help plants develop resilience to weeds and pests, so farmers do not need to use any additional chemicals. 

Farmers may opt for fertilizers with the required nutrient content among a wide variety of NPK ratios depending on what is best suited for a particular season. With the slow-release granular fertilizer, they do not have to worry about winter stress. Instead, they need to add a high-potassium fertilizer.

3. Improved Microbial Activity

Granules need to be broken down for effective absorption into the soil, and soil microorganisms act on these granules to ensure successful breakdown. The microbial activity on the fertilizer granules metabolizes the granules, releasing essential nutrients into the soil. This improves the microbial activity as well as soil nourishment. 

4. Improved Biodiversity

Many species live in lush green spaces, with resilient plants, and stronger roots. Different types of biodiversity flourish in a well-established and fertilized garden. Thus, granular fertilizers can support massive biodiversity if applied correctly and regularly. 

5. Economical Among Others

Granular fertilizers are usually cheaper than most liquid fertilizers. They cost less and don't need to be applied as often, making them a cost-effective choice. Additionally, granular fertilizers have a long shelf life, so growers can buy them in bulk when prices are good and store them for a long time.

6. Supports Carbon Sequestration

Plants are considered a good sink for accommodating atmospheric carbon, which is a significant contributor to greenhouse gases and, thus, a notable agent causing climate change. Healthy plant growth due to the granular fertilizer having a suitable NPK ratio results in storing that carbon and converting it into organic carbon, a beneficial component for the soil. This way, granular fertilizers indirectly contribute to increased carbon sequestration. 

7. Convenient Application

Granular fertilizer is the most convenient type of fertilizer. Growers can select from a range of suitable fertilizer spreaders based on the space in which they apply granules. All they have to do is fill the granules in the spreader, attach it to a vehicle, and drive it to fertilize the area. This super-easy process ensures the uniform distribution of granules in the right amount.

FAQs

What can be done to reverse the over-application of granular fertilizer?

Over-application of granular fertilizers is very harmful to the soil and plants, as it can cause nutrient burn and thatch build-up. If an excessive amount is applied mistakenly, growers should immediately add water. This excess water will dilute the fertilizer, preventing the plants from over-fertilization. 

Is it possible to use a combination of granular fertilizer and organic compost?

Yes, it is efficient to mix both the granular fertilizer and the organic compost. Growers may choose water-soluble or controlled-release granular fertilizer to mix with organic compost. 

Is it OK to store granular fertilizers openly?

No, granular fertilizers can not be stored openly. Instead, they require proper storage in a dry place. Keeping them exposed will result in clump formation due to humidity, and excess temperature may make them ineffective. Growers need to consider specific storage instructions usually mentioned on the fertilizer pack. 

The Bottom Line

Granular fertilizers are essential for plant growth and for improving soil structure. Their gradual release of nutrients is ideal in both gardening and agricultural setups for certain conditions like winter dormancy and environmental stresses. By adding granular fertilizers into gardens and agricultural areas’ fertilizing routines, growers can ensure healthier plants with improved overall growth and high-quality produce.

With increasing concerns about sustainable gardening and agricultural practices, growers can find granular fertilizers a go-to option for nutrient management in their lawns. Explore Growcycle to find the best granular fertilizers for lawns, vegetable gardens, and indoor plants, depending on the requirements of the area to be fertilized.

Disclaimer: This material is for informational purposes only and should not be relied on for legal, medical, financial, or any other form of professional advice.

About the Author

Victor Miller

Environmental Journalist Focused on Sustainable Agriculture

Victor Miller is an environmental journalist at Growcycle, where he covers the latest news, trends, and innovations in sustainable agriculture. He has a deep passion for storytelling that emphasizes ecological balance and responsible farming practices.

Before joining Growcycle, Victor worked for several agricultural and environmental publications, reporting on significant environmental issues and interviewing key figures in the sustainability sector. His work has been featured in various industry journals and online platforms.