How we understand the NPK content in both chemical fertilisers and organic fertilisers?
People are often misled by the NPK number on a bag of chemical fertiliser because it seemingly always higher than organic fertilisers and the cost of same weight of chemical fertiliser is also less or the same. To understand this, it is important to understand that plants is only taking as much nutrients as they need for healthy growth.
The nutrients in chemical fertilisers has to be soluble in water as form of salt for the plants to take in. However, there is a big problem of using chemical fertilisers. That once the chemical dissolved in water, the salt will runoff via evaporation, gasification and end up huge percentage of nutrients will not be taken by the plants and go into underground water and pollute streams, lakes and oceans. The chemical fertilisers manufacture are normally produce high NPK chemical fertilisers to compensate the losses to runoff, evaporation and gasification. On the other hand, the organic fertilisers’ NPK percentage are nutrient content of the ingredients as the plants need.
What’s the advantage of using organic fertilisers?
Organic fertiliser works as nature organic landscapes. It is healthier, less run off, self sustaining, water retaining, and cheaper to maintain. Once the organic set out is there, only small amount of organic fertiliser needed to be maintained compared to chemical fertiliser. Therefore, the organic fertiliser provides a stable ongoing process of releasing nutrients from itself and the soil.