So what can be done to prevent a food shortage, without using more fertilizer? While some scientists continue to experiment with alternative future food sources including insects and algae—a renewable, nutrient-dense crop that also acts as a fertilizer—farmers are looking to technology, specifically "precision farming" techniques, to make production more efficient. Techcrunch reports that better weather forecasting in the farming process can provide "insights into when and how much to irrigate, or how to increase crop yield while reducing the use of pesticie and fertilizer." For example, a farm in Kentucky is now using an app, hosted by agriculture mega-corporation John Deere, no less, to calibrate fertilizer purchases in accordance with weather forecasts. It's indicative of a broad set of practices that are being adopted across the country: The Fertilizer Institute calls it the 4R Nutrient Stewardship (use of right fertilizer source at the right rate, the right time, and in the right place).