Bitcoin is just money. The only comparation or correlation between agriculture and bitcoin I could think about is the same when we talk about fiat and agriculture: you work as a farmer, grow your crops, sell it and are paid. So you use part of your payment to re-invest in the land and keep this cycle of work going on. You could do the same with bitcoin, instead of using fiat. Actually I think that is all and the same is valid for any other profession.
Honestly We need to take this like people are deliberately looking for some innovation into their regular routine works. Because of lack of innovation in most of our day-to-day sectors, people who are all involving into those business, seeking some improvement so that they are believing changes of their lifestyle somehow. So I'm not seeing this like annoying when someone is looking for enhancement into agriculture because of bitcoin/blockchain technology.
At least through being a new and innovate payment processor, bitcoin may help agriculture in terms of attracting new customers and then regular buyers.