I have a proposal to develop an app that allows generating a recommendation for crop nutrition, based on a new model for understanding integrated fertilization management, with which a rational and efficient recommendation is achieved based on the crop requirements and the sustainability of the production system.
Tech companies generally, including Google, don't pay for unsolicited ideas.
The best way to get paid for an idea by Google is to either apply for a job and get hired by them; or to found your own company based on the idea and grow it to the point that Google is interested in purchasing it.