Natural Phosphorus and Potassium For Plants are great alternatives to the synthetic ingredients typically found in commercial fertilizers. Natural phosphorus and potassium are derived from a variety of sources including animal manure, green manures, seaweed, rock phosphates, ashes, or mineral deposits. They are considered slow-release fertilizers because they don’t dissolve in water, so they can be applied to the soil at a rate that won’t burn plants or harm the environment.

Natural phosphorous is also known as phosphate. It is an important nutrient that aids in plant growth. Phosphorus helps develop strong roots and increases plant size by providing energy for healthy cell development. The main sources of phosphate for plants include: rock phosphate, bone meal, ground oyster shells, cottonseed meal, colloidal phosphate, and wood ash.

Potassium helps plants grow bigger by improving root development and increasing resistance to stress conditions like drought. The main sources of potassium include: wood ashes or potash (potassium carbonate).

You’ve probably wondered where to get your plants the requisite amounts of phosphorus and potassium. There are many ways to get them, including manure, bone meal, compost, and even kelp. Read on to find out more about these and other methods. But before you start using any of these methods, make sure to know the benefits and disadvantages of each. Below, we’ll cover the three most common methods for supplying these essential nutrients to your plants.

Bone meal

Phosphorus is one of three primary essential nutrients for plants. It improves yields and the quality of crops, and protects plants from extreme temperatures, drought, and stress. Potassium strengthens plant stems and roots and increases cell wall strength, preventing wilting. In addition to its beneficial effect on plants, phosphorus is necessary for optimal crop yields and helps plants store energy. It also promotes root and flower development and early maturity.

Bone meal is an excellent source of phosphorus and potassium for plants and can be applied to the soil as part of an organic fertilizer recipe. Bone meal is easily digestible by plants and can be mixed with soil to increase fertility in the soil. To apply it in your garden, sprinkle a thin layer over the soil and water thoroughly. Within two to three weeks, the bone meal should break down and provide nutrients to the plants.

When preparing soil for planting, use a nutrient solution containing four to eight tablespoons of bone meal per gallon of water. Add bone meal to the planting hole, and make sure to test the solution for pH and phosphorus levels. If the soil is too acidic, the nutrient solution will not function properly. Apply the solution to the soil prior to planting to ensure the correct balance.

Aside from adding nutrition to the soil, bone meal can improve the overall health of your garden by increasing the level of phosphorus and potassium in the soil. Bone meal is also easily digested by plants and is a good source of calcium and phosphorus. It is a better soil amendment than Soft Rock Phosphate, and is also easier to use.

Rock phosphate

In gardens, you can apply soft rock phosphate to the soil before planting trees and shrubs. You can also rake it into the soil before planting to provide supplemental nutrients to your plants. However, this method works best for acidic soils. Phosphorus is soluble in acidic soils, and the plant roots can absorb the phosphate without any problems. Therefore, you should avoid adding rock phosphate to non-acid soils.

The study showed that the use of rocks containing phosphorus and potassium increased K uptake by maize roots. The researchers also observed that when these two nutrients are applied to soils with low fertility, the bacteria that break down phosphorus and potassium have an important role to play. The co-inoculation of plants with PK-solubilising bacteria resulted in a significant increase in K uptake by maize roots.

Although the application of rock dust is slow, it benefits plants over a long period of time. For best results, you should apply it in the early spring, before the flowering season. A 10 pounds dose is suitable for 100 square feet of soil. However, it is important to know the soil type before you apply rock phosphate. Soils with a pH lower than 5.5 are better suited for the application of rock dust. Acidic soils contain high levels of phosphorus and will allow the plant roots to absorb the mineral in the soil.

In the experiment, rock phosphate and potassium were applied to the soils of eight plants. In all, the phosphorus concentration was 15 percent and potassium was 4 percent. The soils were subsequently planted with rhizobacteria. Han et al. identified Bacillus megaterium var. phosphaticum as the responsible bacterium in 2003. They also found that the rock mixtures increased the availability of P and K.


Using fertilizers with a high phosphorus content is an excellent way to feed your plants. However, too much phosphorus can prevent your plants from absorbing other essential nutrients, such as calcium, iron, and zinc. You can get the right balance by mixing compost with some fish meal or bone meal. But, if you don’t want to use fish meal, you can use other organic sources of phosphorus, such as bone meal.

Another natural potassium source is wood ash, which was once the original source of “potash” fertilizers. It can be applied directly to plants, or added to the compost pile. This form of potassium increases the pH of soil, so make sure to regularly test it before using it. Other sources of potassium include kelp meal, which comes in liquid and dried forms. Greensand, which is mined from ancient sea beds, also contains potassium.

Another organic source of phosphorus and potassium is coffee grinds. It is a cheap source of nitrogen and a decent mulch, but can cause a caffeine rush in pets. If you want to add these nutrients naturally to your soil, consider mixing coffee grounds with your compost. Coffee grinds can help your plants by improving their water-use efficiency. But be careful if you want to use coffee grinds, since they contain caffeine that can be harmful to pets.

Among the most effective sources of phosphorus and potassium for plants is cow manure. It is a highly effective organic source of phosphorus and potassium, with about 3% of nitrogen, 2% phosphorus, and 1% potassium. It is a gentle way to balance soil nutrients. Also, manure contains significant amounts of beneficial microorganisms that help plants grow. So, while you might not find it an ideal source of phosphorus and potassium for plants, it can help your plants thrive.


You can use kelp as a source of potassium and phosphorus for plants in a variety of ways. It is commonly used in liquid fertilizers, but you can also buy dried kelp meal. In addition, greensand is a source of potassium and works well in the garden as a soil conditioner. You can also use muriate of Potash, which is a naturally occurring form of potassium chloride. This form of potash is not as potent as kelp, and will need to be mixed with compost.

Kelp contains almost every element on the periodic table. As a result, it is a natural source of macro and micronutrients. It also contains a variety of trace elements. Additionally, seaweed products have lower N-P-K values than traditional plant foods. This makes them more readily available for uptake and less likely to leach from the soil. Furthermore, the microorganisms in seaweed fertilizers reduce leaching.

Plants can benefit from a higher amount of phosphorus when they have a larger soil volume. It can be added to the soil using foliar kelp fertilizers, and you can also add a higher amount of phosphorous to your soil by adding manure. Compost is a great way to balance soil nutrients and kelp can help boost the availability of these nutrients.


Manure is an abundant source of nutrients for plants. It contains phosphorus and potassium that are essential for plant growth. Animal manures also contain other trace elements such as calcium and magnesium, and up to 70% of the nitrogen in feeds is excreted in manure. Hence, manure provides nutrients to replace commercial fertilizers used in crops and pastures. Besides being a rich source of nutrients, manure also contains organic carbon which plays a key role in maintaining the soil’s health, which includes the cation exchange capacity, tilth, and water holding capacity.

There are many types of manure, and their amounts vary considerably. The most commonly used type is animal manure, which contains 0.5% to 1% phosphorus by weight and is effective for four to six months. Some manures also contain nitrogen and potassium, but not in sufficient quantities for effective plant growth. Manure is a slow-release natural source of phosphorus and potassium for plants, but should be properly decomposed before use.

In terms of nutrient content, manure is a very good source of P and K. However, when manure is applied to meet crop N needs, there is likely excess P in the manure. This is because some P is in insoluble organic compounds and has to be mineralized before it can be used by plants. In this way, it is important to conserve the manure’s P. This helps to maximize its efficiency for plant growth, reduces the amount of manure that is applied, and avoids nutrient-rich excess.

Organic sources of phosphorus and potassium include apatite, which is the primary source of phosphorus and potassium. It is also a valuable source of organic matter, with approximately 3% nitrogen, 2% phosphorus, and 1% potassium. Furthermore, manure contains significant amounts of ammonia and other microorganisms, which are harmful to plants.

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