Sustainable agriculture

Cotton is one of the most valuable crops grown in the U.S., with a harvest value of some US$7 billion yearly. It is cultivated across a crescent of 17 states stretching from Virginia to California and is used in virtually every type of clothing, as well as in medical supplies and home goods such as upholstery. Cotton grows inside a hard, fibrous case called a boll. About 100 days after planting, the bolls mature and split open, revealing thousands of fluffy white fibers inside. Each boll contains 20 to 40 seeds with fibers attached to them, which is why the cotton plant’s fruit is called seed cotton. Picking cotton manually, as is still done in some major producing countries, is a meticulous task. Workers have to bend to reach the bolls and can hurt their hands on hard, dry parts of the plants. To harvest the seed cotton, they have to grab and twist it to separate it from the boll without leaving fiber behind. Starting in the 1930s, cotton farmers in the U.S. shifted f...

Flowers grown on inexpensive floating platforms can help clean polluted waterways, over 12 weeks extracting 52% more phosphorus and 36% more nitrogen than the natural nitrogen cycle removes from untreated water, according to our new research. In addition to filtering water, the cut flowers can generate income via the multibillion-dollar floral market. In our trials of various flowers, giant marigolds stood out as the most successful, producing long, marketable stems and large blooms. Their yield matched typical flower farm production. Why it matters Water pollution is caused in large part by runoff from farms, urban lawns and even septic tanks. When it rains, excess phosphorus, nitrogen and other chemicals wash into lakes and rivers. These nutrients feed algae, leading to widespread and harmful algae blooms, which can severely lower oxygen in water, creating “dead zones” where aquatic life cannot survive. Nutrient runoff is a critical issue as urban areas expand,...

For the 20th time since 1933, Congress is writing a multiyear farm bill that will shape what kind of food U.S. farmers grow, how they raise it and how it gets to consumers. These measures are large, complex and expensive: The next farm bill is projected to cost taxpayers US$1.5 trillion over 10 years. Modern farm bills address many things besides food, from rural broadband access to biofuels and even help for small towns to buy police cars. These measures bring out a dizzying range of interest groups with diverse agendas. Umbrella organizations like the American Farm Bureau Federation and the National Farmers Union typically focus on farm subsidies and crop insurance. The National Sustainable Agriculture Coalition advocates for small farmers and ranchers. Industry-specific groups, such as cattlemen, fruit and vegetable growers and organic producers, all have their own interests. Environmental and conservation groups seek to influence policies that affect land use and sustaina...