Fresh cow dung Manure is one of the most well-known fertilizers, rich in nutrients necessary for the growth of cultivated plants. However, fresh cow dung has a too high concentration of beneficial elements. If used in planting holes, plants can suffer chemical burns and die. It is better to wait a year or two until the manure turns into compost, or to dilute a small amount in water and water the beds with this infusion. Potassium permanganate A solution of potassium permanganate is often used for disinfecting seeds and garden tools from fungal diseases and harmful microorganisms. Some gardeners use potassium permanganate to feed seedlings and young plants. However, this is not recommended: potassium permanganate is a strong oxidizer that should not be used on acidic soils, and it is useless on alkaline ones. Watering the soil with potassium permanganate can also harm beneficial bacteria. Yeast Some gardeners use yeast as fertilizer, but this is not entirely correct. Yeast only stimulates the growth of soil bacteria and does not affect the plants. They should be used together with ash or organic substances. Moreover, during fermentation, yeast can extract beneficial nutrients from the soil, such as potassium and calcium. Salt Even experienced gardeners use salt to combat ants and slugs. However, salt does not harm insects, but it is very harmful to plants and soil. Salt solutions are also used to water areas to destroy weeds, but this leads to vegetables stopping their growth. When water evaporates, a crust forms on the surface, preventing plants from obtaining moisture and oxygen. To mitigate the effects, the area can be dug up and mixed with sand or compost. Banana peels Banana peels contain a lot of potassium, phosphorus, and magnesium, which are necessary for the growth of garden plants. They can be used in dry or crushed form, often added to planting holes. However, bananas contain substances that can acidify the soil, worsen the taste of fruits, and increase the risk of rot diseases, making this method controversial. Baking soda Baking soda does not benefit plants. Vegetables cannot tolerate sodium, which can slow their development. Some gardeners believe that baking soda helps to alkalize acidic soil, but a large amount of powder would be required for this. It is safer to use wood ash or slaked lime.