Does it mean farmers cannot use bitcoin to improve their peasant or plantation farm?
You can use it as mean of exchange. To by and sell farm products. Problem is that Bitcoin have high fees and solution for Bitcoin high fees is not that helpful. Hopefully eventually second layer solutions will be widely used and you will be able to use it in your farming life. Right now Bitcoin for you can be only as a speculation. You can speculate with its value. It worked very well for many so far. Question is for how long.
not only the agricultural sector, other sectors may also experience the same thing. We can imagine that with a large fee, each transaction will require additional fees, indeed on the one hand, with bitcoin the payment will be faster, but with a large fee, I think it is not suitable at this time.