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Fertilizing
Raspberries: Pruning, fertilizing & propagating
Compost tea is a natural organic fertilizer and can be used to prevent fungal diseases. You can find out how to make compost tea and use it in your garden in this article.
Compost tea is a cold water extract made from compost or earthworm humus. Humus and compost contain numerous ingredients that accumulate in the water: in addition to nutrients such as nitrogen, potassium and phosphorus, they also contain trace elements, micronutrients, humic acids, effective microorganisms (EM), enzymes and amino acids etc.. Compost tea therefore provides a wide range of plant-strengthening active ingredients and nutrients that promote soil and plant health.
Watering compost tea promotes numerous processes in the soil and therefore healthy soil. Effective microorganisms and other ingredients promote biological activity in the soil. This also increases the conversion of organic matter and builds up humus. This in turn improves the soil structure, water retention capacity and nutrient availability. Plant roots can grow best in loose, crumbly soil. Good root growth goes hand in hand with improved water and nutrient uptake. This makes your plants less susceptible to drought stress.
The increased biological activity of microbes has a positive effect on the entire ecosystem. This is because microbes are at the beginning of the soil food web: diversity on a small scale promotes diversity on a large scale . Indirectly, biodiversity also contributes to preventive plant protection, as a healthy ecosystem is inherently less susceptible to diseases and other pathogens.
Improved soil health also has a positive effect on plants. On the one hand, their resistance increases due to better growth conditions (root growth, nutrient availability). On the other hand, through so-called induced resistance, which is triggered by various substances in the soil, such as humic substances. The plants become more resistant, especially to soil-borne diseases and fungal diseases.
Spraying the leaves and soil with compost tea also has a direct plant-strengthening effect. "Good" microorganisms colonize the soil, roots and plant surface. This makes it difficult for pathogens such as fungi to colonize and spread on the plant.
It is important to note that most of the positive effects of compost tea on soil and plants have unfortunately not yet been empirically proven. There are already studies that have found effects, but unfortunately these are often not reproducible. There is only one thing on which there is relative agreement: compost tea is an effective means of preventing fungal diseases such as mildew, gray mold and late blight. It certainly has the potential to reduce the use of fungicides. This is why compost tea is already being used in both organic and conventional agriculture to prevent fungal diseases. However, compost tea mainly has a preventative effect and only a limited effect in the event of an infestation.
Compost tea itself contains all dissolved nutrients. These are available to plants and can be absorbed directly via the roots and leaves. Therefore, a foliar spray can quickly help with a nutrient deficiency. Indirectly, compost tea improves the soil and increases the decomposition and conversion of organic matter, which also releases plant-available nutrients. Compost tea therefore also has a long-term fertilizing effect.
Our tip: Numerous microorganisms from the humus are enriched in compost tea. To enrich your garden soil with the most suitable microbes, you should use your own compost or earthworm humus from your garden.
Our tip: You can also add wild herbs that can be found in any garden to the compost tea. Some wild herbs such as comfrey, field horsetail, valerian or marigold also have plant-strengthening effects.
Unfortunately, compost tea cannot be stored for long and must therefore always be brewed fresh. You can store the tea for a few days, but you should always stir it a little to add oxygen to the water. The bacteria need oxygen to survive and as soon as this is used up, the tea starts to rot and spoil. You will notice this by an unpleasant, pungent smell. You should then dispose of the compost tea.
Application | Application recommendations |
---|---|
as fertilizer | undiluted or diluted with rainwater at a ratio of 1:5; apply to the soil every 1 - 2 weeks; winter fertilization every 4 weeks |
to strengthen plants | diluted with rainwater at a ratio of 1:10; apply every 1 - 2 weeks as foliar fertilization |
as soil conditioner | undiluted or diluted with rainwater at a ratio of 1:5; every 2 to 3 weeks |
as a starter for compost preparation | undiluted or diluted with rainwater at a ratio of 1:1 |
In addition to compost tea, there are other plant strengthening agents that you can use in your garden: these include organic plant strengthening agents such as plant juices, plant teas or decoctions or inorganic agents such as rock powders.
Good luck making your own compost tea! If you have any questions or comments, please write to us at [email protected].
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Cover picture by Ben Kerckx on Pixabay
Marie is an agronomist. She is particularly interested in the sustainable and organic cultivation of vegetables and other plants. In her own garden, she gained experience and likes to try things out to learn from nature. She is particularly interested in the values and principles of permaculture, in order to contribute not only to the well-being of nature, but also to the well-being of people and future generations.
Learn moreCompost tea is a cold water extract made from compost or earthworm humus. This tea is therefore rich in nutrients, humic acids and effective microorganisms that promote plant growth and health.
What can you use compost tea for in the garden?
You can use compost tea in a variety of ways in the garden. On the one hand to improve the soil. On the other hand, to strengthen plants and prevent fungal diseases. Compost tea is also suitable as a fertilizer.
To make compost tea, mix about 1 liter of compost with 10 liters of water. Leave the mixture to infuse for 2 to 3 hours, stirring several times. Then it's ready to use!
Does compost tea help against fungal diseases?
Compost tea is an effective means of preventing fungal diseases such as mildew, gray mold and late blight. It therefore has the potential to reduce the use of fungicides.