Sustaining soil moisture is the biggest bottleneck to improving agricultural productivity in India. In much of India, it rains for only a few months a year, during the monsoons. For the rest of the year, the soil is too dry to grow anything unless farmers have access to a water source that allows them to irrigate. The problem is, in most of India, there is simply not enough water for everyone to grow water-intensive crops year-round. Irrigation would only work as a strategy if everyone uses a bit of extra water to prevent crop failure during the monsoon or irrigate low-water intensity crops in the dry season.