Best fertilizer?

I use 4 year old farm yard manure which I have delivered every 3 years at £15 a load. I have 2 loads delivered at a time in case in the future I am not able to move it to the bins at the top end of the allotment. I only use the manure under potatoes, in my onion and garlic beds and underneath courgettes. I am a big believer in blood fish and bone it goes along way whereas growmore tends to stick together if you have any left for the following year. I use maxi crop as a booster and comfrey as well but only make it from nettles

 

My go-to fertilizer would be a mixture of:
- Cattle manure - they sell it as dried pellets for like 5€ per 25kg bag
- (volcanic) rock flour/dust - again, dirt cheap and easy to get
- Horn shavings (from cattle horns and hooves) - as a long-term nitrogen supplement

With a mixture of those three, almost all of my plants seem to thrive without any effort. And since they aren't highly concentrated there is almost no chance of overdoing it. Just put a handfull of each in the planting hole, stir it up a little and watch the magic happen.

 

Hello , I use Blood Fish & Bone on fruits
Chicken pellets
I was given some bags volcanic mineral rock dust which I’ve been put on my large beds

We get horse manure delivered to our site , free , just help your self , I cover my small beds over winter , then in the spring dig it in or put in compost bins , depending on the crop I’m growing

I also use my own compost as a mulch