Posted: 05/11/2013 at 21:05
When and where to use potash and nitrogen depends on what you plan to grow
Nitrogen - promotes above ground growth and healthy foilage. Potash - helps promote flowering and the ripening of fruit and veg. Phosphate is for root growth.
FBB, bone meal and dried blood,are fertilisers and additions to compost...so...
Fish,bone and blood - FBB contains all three elements, I'd say it's a good all rounder and not used in huge quantities would say it's good for most things. There maybe someone along shortly to say I'm wrong.
Bone meal contains phosphate and nitogen - good for shrubs, roses, bulbs and strawberries.
Dried blood contains nitrogen, if growing veg it's good for leaf crops like lettuce, spinach and cabbage.