The residue of burning plants (herbs and woody plants) is called plant ash.
Plant ash Fertilizer Because plant ash is the ashes of burning plants, almost all the mineral elements contained in plants are in plant ash. Among them, potassium is the most abundant, generally containing 6- 12%, of which more than 90% is water-soluble and exists in the form of carbonate; Followed by phosphorus, generally containing1.5-3%; It also contains calcium, magnesium, silicon, sulfur and micronutrients such as iron, manganese, copper, zinc, boron and molybdenum. The ash content of different plants is different, and the potassium content of sunflower straw is the highest (see the table below for details). The fertilizer efficiency of plant ash with the same amount of potassium is better than that of chemical potassium fertilizer. Therefore, it is an inorganic farmyard manure with wide sources, low cost, complete nutrients and remarkable fertilizer efficiency. The main component of plant ash is potassium carbonate (K2CO3) with a relative molecular weight of 138.