Posted: 06/12/2013 at 23:11
Non organic fertilisers just supply NPK. growmore, sulphate of potash and ammonium sulphate come into this bracket.
Organic fertilisers supply micronutrients such as selenium, and copper which are only needed in tiny amounts. Its a bit like us living on a diet of boiled rice and fried fish. we would still get adequate protein, fat and carbohydrate but we would be missing all the vitamins and minerals needed in small quantities. Feeding plants on quick fix inorganics leads to poorer quality veg in my opinion. Also, adding humus back into the soil with compost or manure, stabilises the soil, enhances its water holding properties, and stops sandy soils blowing away in a gale.