精东影业

This October, conditions permitting, Illinois farmer Scott Eversgerd will sow his soybean fields with winter wheat. That wheat will mature the following June, and the same day he cuts it, he鈥檒l drill soybeans directly into the residue. Later that season, in September, he鈥檒l harvest the soybeans, thereby profiting from two cash crops in one year. This is known as 鈥渄ouble-cropping.鈥�

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This practice is expanding throughout the world, in part because market pressures such as the war in Ukraine, drought in India, and inflation have increased commodity prices. But due to economic risks as well as agronomic limitations to the practice, double-cropping is not a fit for every farmer and every field. Here鈥檚 what farmers should know before doubling down on a second crop.

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What鈥檚 grown where鈥攁nd why

In the past, Eversgerd鈥檚 Illinois land wouldn鈥檛 have been suited to double-cropping since climate has long determined who can double-crop (or even multicrop). Wherever there is abundant sunlight, adequate rainfall, and above-freezing temperatures year-round鈥攈istorically, the Global South鈥攆armers have multicropped as a matter of course. Today, the most intensively cultivated farmland is in East Asia and South Asia, where 63 percent of the world鈥檚 multicroppers farm. Farmers there can sow and harvest upwards of three crops (typically rice) on the same acreage every year.

Southeast Asia and sub-Saharan Africa together account for another 20 percent of the world鈥檚 multicroppers. The Middle East and North Africa, Oceania, and South America account for about 13 percent, with Europe, Central America, and North America around 4 percent.¹

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Pushing the envelope

Advances in agronomy promise to expand the area multicropped worldwide, easing food shortages without accelerating climate change. Research indicates that double-cropping could increase world food supplies by upwards of 31 percent,² while decreasing the conversion of forest to farmland.³

Other high-quality inputs ensure that the seed investment pays off, but double-cropping also helps farmers get more from each of those inputs. Double-cropping keeps soils protected by retaining and building soil structure and maintaining fertility, reducing the need for enhancements.8听No-till double-crop systems can require fewer herbicide and pesticide applications, as the first-crop residue naturally suppresses weeds, and serial crop rotation disrupts pest cycles⁹听But in other respects, double-crop systems may require investments that full-season crops do not. In no-till systems, the need for fungicide is greater, as late-season moisture makes first-crop residue a breeding ground for disease. Fertilizer needs can also be one and a half times as great, to compensate for nutrients removed by the first crop or for the stress associated with the shorter season.¹⁰听And pest populations can shift from one crop to another.¹¹

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Fortunately, agriscience is keeping pace. Like all farmers, those who are double-cropping soybeans have increased yields by selecting seeds bred for disease tolerance or resistance,12听treating seeds with nitrogen-fixing bacteria,13听applying nitrogen to the soil during pod fill,14听and applying a late-season foliar fungicide deep in the canopy.15

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Reaping the dividends

Aside from the cost of an extra fungicide application, Eversgerd says, his input investment for double-cropped soybeans is about the same as for full-season soybeans. While the second crop does require fertilizer, the wheat straw that the soybeans emerge from suppresses weed pressure, allowing Eversgerd to get good yields with one instead of two postemergence herbicide applications. With second-crop insurance available in his county, the risk incurred for the second crop is about the same as for the first.

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鈥淲ith this high-touch approach, we know we can get two cash crops a year, or three crops鈥攃orn, wheat, [soy]beans鈥攅very two years,鈥� he says. 鈥淎gronomically and economically, it works very well.鈥�