What are some alternative fertiliser options to NPK for sustainable agriculture practices?Hey all. As a consumer looking to adopt more sustainable gardening practices, I'm curious about alternative fertiliser options to NPK that can help promote healthy soil and plants. Can you recommend some organic fertilisers or other sustainable options that are effective at nourishing crops without the negative environmental impact associated with the use of synthetic fertilisers? Additionally, how can I determine which type of fertiliser is best suited for my specific gardening needs?