Reddit mentions of Mastering the Grain Markets: How Profits Are Really Made

Here's a book about one subset of the topic:

https://www.amazon.com/Mastering-Grain-Markets-Profits-Really/dp/1477582967

Basically, a computer can't call up a farmer and feel him out for how his crop is doing and see how motivated he is to sell. There are plenty of quant traders in the markets too, but they're subservient to fundamentals most of the time, and the people that know fundamentals are people with rolodexes.

Good luck!

If I may add — and please note that I have no idea where you are in your learning curve, so please disregard if this isn't useful suggestion —, there's a book a like a lot and recommend to every trader relatively new to the commodity markets (and more specifically futures, due to the mind-blowing amount of new possibilities compared to commodity ETFs, and the book goes over many of these amazing possibilities).

Mastering the Grain Markets: How Profits Are Really Made, by Elaine Kub: https://www.amazon.com/Mastering-Grain-Markets-Profits-Really/dp/1477582967

The author, Elaine Kub, has a great writing style, mixing some very technical stuff with some very nice personal stories of her childhood — she grew up on a family farm (that she still operates!), and has extensive experience as a grain merchandiser and futures broker.

[Oil 101]
(https://www.amazon.com/Oil-101-Morgan-Downey/dp/0982039204)
isn't bad. [Masting the Grain Markets] (https://www.amazon.com/Mastering-Grain-Markets-Profits-Really/dp/1477582967) also isn't bad. Neither will teach you everything you need to know, that will only come on the job.