DESPITE the four-year drought that has parched California and led to mandatory restrictions on water use, farmers there have kept feeding the country. California produces more of 66 different food crops than any other state, $54 billion of food annually.

Maintaining this level of productivity has been quite a challenge in recent years and is likely to become more difficult over the next few decades as weather patterns, available water and growing seasons shift further and threats of invasive weeds, pests and pathogens rise.

If agriculture is to have any chance of answering these challenges, we must have new and improved techniques and technologies. The problem is that agricultural innovation has not kept pace.

The last time our nation was in a similar crisis was just after the Dust Bowl years in the 1940s, but the country’s agricultural science enterprise was in much better shape. At that point, almost 40 percent of American research and development spending was focused on agriculture. This ambitious embrace of research was part of the “green revolution” that significantly boosted agricultural output around the world.