NPK doesn’t have to be animal based – there are plenty of plant based fertilizers and soil amendments if you wish to avoid using animal products in your garden.
Advantages of non-animal fertilizers
Not using animal products in the garden might not be something you have considered before but going 'animal free' in the garden does have its advantages -
Fertilizers derived from non animal sources do not contain any pathogens such as ecoli. This is important if you are growing salad or baby leaf crops which are grown for raw consumption.
Non animal fertilizers