Please teach me how could I use a crypto for developing agriculture in my country?
Do you mean cryptocurrency or blockchain? Cryptocurrency is mainly for the purpose of transaction and investment.
So, if youre referring to cryptocurrency there isnt really much that can be done about it apart from investment.
You can create an online platform that will let people in your country to be investing on your farms with cryptocurrency and after the period that was set they will get their money back with the percentage profit. Then apart from that, blockchain can be used in few ways in agriculture like tracing how the agricultural products are being distributed to the consumers. There are lots of ways that blockchain can be useful in agriculture, as for cryptocurrency its just investments.