Andre CampbellBat guano is highly nutritious for plants. It is helpful as an organic fertilizer.
Bat guano can help improve plant growth and may increase yields when used correctly. It is also suitable for lawns.
You can use it on vegetables, nut trees, herbs, fruit trees, and even flowers and ornamentals.
Below are more benefits and uses of bat guano fertilizer.
What Is Bat Guano?
Bat guano is the collected and amassed excrement of bats. Bat guano is simply bat droppings that have accumulated over time. Commercial bat guano products are often sold in dried, powdered, granular, or pelletized forms.
The word “guano” comes from the Quechua word wanu, meaning dung or fertilizer [1]. Guano generally refers to the accumulated excrement from bats, seabirds, or seals. This waste builds up over time and is widely used as a natural fertilizer.
You can find it in caves all over the globe, where these caves become storehouses of this natural fertilizer. The bat droppings also contain the remains of insects and other bat food.
Over time, guano accumulates and naturally decomposes, creating nutrient-rich deposits valued as fertilizer. While the historic guano industry focused primarily on seabird guano from regions such as Peru, bat guano is collected worldwide from caves.
Guano’s properties make it a valuable organic fertilizer and soil amendment for many gardeners.
Nutrients It Contains
Guano is a rich source of nutrients for garden plants [2]. It supplies nitrogen, phosphorus, and potassium (NPK), as well as calcium, sulfur, and other trace nutrients.
- Nitrogen promotes vigorous leafy growth and is essential for photosynthesis.
- Phosphorus supports root development, flowering, fruit production, and energy transfer within plants.
- Potassium helps grow strong stems and increases resistance to pests and diseases.
- Calcium is essential for supporting plant cell structure.
- Sulfur is necessary for chlorophyll formation, among other functions. To tell if your plant has a sulfur deficiency, you will notice a pale green color or yellowing of the entire plant.
Guano content varies among species and across regional diets. It may also contain insect remains, including exoskeletons that provide chitin [3].
Chitin can support beneficial soil microorganisms. It may also help stimulate natural plant defense responses.
Because it is naturally rich in nitrogen and phosphorus, bat guano is often considered one of the more nutrient-dense organic fertilizers available to home gardeners.
Bat Guano Benefits
Guano provides multiple benefits for the organic gardener.
The available nutrients encourage strong, healthy growth in all types of plants. The high nitrogen levels help the plants grow strong and healthy.
Some studies suggest that guano may help suppress certain soil-borne pathogens. It can also contribute to overall soil health. However, it should not be considered a replacement for disease management practices.
You can also treat lawns with guano to strengthen and improve their quality and enhance their green color.
A further benefit for organic gardeners is composting. You can use guano in the compost heap as an activator to accelerate decomposition.
Composted guano makes an excellent fertilizer. Handle and compost guano carefully to minimize exposure to fungal spores.
When used according to label directions, bat guano can support the growth of seedlings and young plants. The slow release of nutrients from bat guano also helps plants, crops, and lawns during the growing season.
Bat guano may also improve soil microbial activity and contribute to long-term soil fertility.
How to Use Bat Guano
Use guano carefully. Follow the package instructions to get the right amount and spread it evenly. If handled properly, it is safe to use both indoors and outdoors.
It is usually sold in packs in dry granular, pelletized, or powdered form and is forked directly into the soil or spread as a top dressing. You can also prepare the tea as a foliar spray or apply it directly to the garden soil.
Some gardeners apply bat guano tea as a foliar spray. However, research on its effectiveness against plant diseases is still limited.
Use this fertilizer at any stage of crop growth. Spray or sprinkle guano powder or pellets around developing plants at any time during the growing season.
Compost tea is a convenient way to feed plants indoors and in greenhouses.
Always follow the manufacturer’s directions when available, as nutrient concentrations vary between products.
Tea Recipe
To make bat guano tea, dilute one cup of bat guano with a gallon of chlorine-free water. You can use warm water; however, never use hot water.
Stir the mixture well and leave it to brew overnight. It is best to prepare the tea in a well-ventilated area, as it may have a strong odor.
When finished, this nutritious plant food will be ready to use as a foliar spray or to apply to the soil around plants.
Alternatively, if fresh guano is available, wrap half a cup in muslin, steep it in 4 gallons of water for 3 to 4 days, and use it as above.
Always check the manufacturer’s recommendations before preparing guano tea. Nutrient concentrations can vary between products, so this step is important.
Plants That Benefit from Bat Guano
All kinds of vegetables, flowers, cannabis plants, shrubs, fruit or nut bushes, and trees can benefit from a drink of guano tea.
Guano fertilizer can also improve herb gardens and vines. Lawns can also benefit from achieving a healthy, greener appearance.
NPK Ratio
Bat guano’s NPK ratio varies depending on the bat species, diet, and processing.
Bat guano fertilizers are often higher in either nitrogen or phosphorus. For example, some products may have an NPK ratio of 10-3-1, while others may be closer to 3-10-1.
High-nitrogen guano is often used to support leafy growth. In contrast, high-phosphorus guano is applied to encourage flowering, fruiting, and root development.
In general, bat guano with higher nitrogen content is used during the vegetative growth stage. Higher-phosphorus products are often used during flowering and fruiting.
Always check the product label for the specific NPK analysis before applying bat guano to your plants. Actual NPK values vary widely among commercial products.
Where to Find It
The easiest and safest way to acquire bat guano is in packaged, dry form from the local gardening store or online. Buy it in small packages or large quantities.
Additionally, natural bat guano deposits are present in caves worldwide. This includes locations in Jamaica, Chile, Cuba, Peru, and Mexico.
However, harvesting can be dangerous. People harvesting guano can come into contact with potentially harmful pathogens that can cause serious illness [4].
Caution
Avoid inhaling bat guano dust when handling dry products. Wear gloves and a dust mask, and follow all package safety instructions.
Raw guano can also contain fungal spores that may cause respiratory illness [5].
Takeaway
People have used guano as fertilizer for many generations.
In some regions, authorities regulate the harvesting of bat guano to help protect bat populations and cave ecosystems.
Sasha Campbell
Can I ask the dosage of applying tea per plant. I mean how many ml per plant?