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Best Sources of Phosphorus for Plants


Plants require three important macronutrients: nitrogen, phosphorus, and potassium. Each macronutrient has an important role to play in the development of plants. Phosphorus, for example, contributes to a number of a key functions including the transfer of energy, the initiation of photosynthesis, and the transformation of starches and sugar. Here are the best sources of phosphorus for household plants.

Bat Guano

Yes, bat dung is an excellent source of phosphorus and has been used for many decades by gardeners. It has a N-P-K ratio of about 0-5-0 so it’s an excellent source of phosphorus (if that’s the only macronutrient that’s lacking in the soil). It can be expensive but we would say it’s well worth it as a phosphorus fertilizer given how long it lasts (usually two to three years).

Bone Meal

Bone meals are another good source of phosphorus that gardeners can easily apply to the soil. Bone meals have a N-P-K ratio of about 3-15-0. You just need a simple rake to mix the bone meal into the soil. It’s great for a variety of plants including bulbs, roses, and certain species of trees and shrubs.

Rock Phosphate

If you need a high concentration of phosphorus then the rock phosphate might just do the job. Generally speaking, this product has a N-P-K ratio of about 0-33-0. Like bat guano, it can last for several years. It’s an important supplement for people who want to grow beautiful, blossoming flowers.

Chicken Manure

People who keep their own chickens at home could even use chicken manure as a source of phosphorus. You could expect chicken manure to have a N-P-K ratio of about 0.8-0.7-0.5. Of all animal manures, you will be surprised to know that chicken manure has the highest amount of nitrogen, phosphorus, and potassium. As a general rule of thumb, one mature chicken could produce up to 11 pounds of manure per month.