Question

From where do farmers obtain the inputs that they require?

Answer 1

Mainly, farmers buy the inputs on local markets or, if they're looking for plants which are not native for the place they're living in it might be wise to travel once a year to another market farther away to get better prices and quality of some plants. 

Over they year, a farmer will use purchased inputs to grow their harvest. Their income is calculated by substracting the amount of money spent on input, fertilizers, workforce and other key-resources from the amount earned from selling crops. 

The idea is that each year the difference should be bigger ;)

Answer 2

Farmers can obtain the inputs in the following ways:

i) Farmers use their savings.

ii) They take loans from cooperative banks or rich money lenders, etc.

iii) They get equipments and machinery from local dealers, etc.

iv) They get the seeds to be planted -- from seed dealers.