Loaded with decaying organic materials, compost enriches the soil, adding structure to it and promoting microbial activity. High potassium levels can contribute to relative nutritional deficiencies, resulting in stunted growth, poor foliage, flower, and fruit production, and, in some cases, the death of the plant. Manure is an enduring favorite of gardeners worldwide for a reason. It’s full of the big three nutrients, with potassium ranging between 0.5 to 1.9% depending on the type of manure used.

Giving plants an extra dose of potassium when they need it most allows them to produce the best quality flowers and fruits possible. Potassium’s role in root development makes it a good choice of fertilizer for seedlings that have been newly transplanted. While cottonseed meal is typically known for its high nitrogen content, it does have a lot of potassium and is an effective source of potassium for plants. Potassium, in common fertilizers, began as a potash salt and cannot be made synthetically. Instead, it is mined from now-dry, ancient seabeds. Once obtained, these natural salts are utilized to provide nutrients to plants. Organic fertilisers: These are derived from plant or animal sources and contain plant nutrients in organic form. Organic products tend to be slower acting, as large organic molecules have to be broken down by soil organisms before the nutrients within them are released for plant use. Examples of organic fertilisers include: seaweed, hoof & horn, dried blood, fish blood & bone, bone meal, poultry manure pellets and liquid comfrey or nettle feeds. Other widely available products include Miracle-GroPerformance Organics All Purpose Concentrated Liquid Plant Food andLevingtonTomorite Organic Concentrate.Applying phosphate and potassium in the spring as a YaraMila NPKS fertiliser brings several benefits:

While these are not an easily available ingredient and not viable for large-scale use, they’re useful for home gardens. Cucumber skins are rich in phosphorus and potassium, and the quantity of these nutrients increases when they’re dried out or burned into ashes, much like other peels and fruit cast-offs like banana peels. If you have a preponderance of grass clippings lay them on a sheet for 24 hours in a sunny place and either add them to your heap (once brown) or mulch raspberries etc. Comfrey tea Soybean meal must be used carefully because it can burn plants if used in excess. Ideally, the meal should be sprinkled or mixed into the soil a few weeks before planting to give it time to break down and release nutrients into the soil. This will protect seeds and seedlings from fertilizer burn. 15. Cucumber Skin Ash Here is a table with some of the best fertilizers with high potassium content. You can find more detail about each type of fertilizer in the article after the table. Using organic potassium sulfate like the Organic Solution Grade Potassium Sulfate by Down to Earth ensures that farming practices don’t harm the environment. The potassium sulfate from Down to Earth is listed by the Organic Materials Review Institute and is designed to be easy for plants to absorb.Digital testing kits – tests for current pH levels and available amounts of nitrogen, phosphorus, and potassium.