Honestly, I don't know how to combine agriculture and cryptocurrency. The only thing that I came up with is to invest money in Bitcoin and Ethereum earned from your land. So you can increase your income
The OP is talking about the country's agriculture like crops, farming etc not only about lands or your own profit. Well for me organizations of agriculture should consider using cryptocurrency so that they can earn more money for the development of agriculture like spending the money they gained with cryptocurrency in buying good fertilizers and more lands to be farmed.
I have an idea. You can create a coin using which you can buy local agricultural products in your country.
I agree with this, they can take advantage of the technology and create their own coin with its sole purpose of helping develop our agriculture.