Almonds now California's second-most valuable commodity

DAVIS
October 18, 2012 11:38am
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•  Move aside, Napa, here come the nuts

•  Central Valley now grows 80 percent of world’s almonds


When California publishes its crop report in November, there will be a significant change in the ranking order of the state's top agricultural commodities, the University of California, Davis, predicts Thursday.

In 2011, for the first time ever, the value of the California almond crop surpassed the state's iconic grape industry to move into second place, behind dairy, the university says.

California almonds are on a roll. In the last 20 years, scientific discovery and grower ingenuity have nearly doubled almond per-acre productivity. A good yield in the 1980s was 1,400 pounds per acre. The average yield for 2011 was 2,670 pounds of shelled almonds per acre, UC Davis says.

Forty years ago, California farmers produced less than 100 million pounds of almonds on about 200,000 acres of almond orchards. Mechanization, improved irrigation efficiency, advances in insect and disease management, pruning research and fertilization studies have fueled explosive growth in the industry.

Farmers in the Central Valley now tend 760,000 acres of almond trees, producing about 2 billion pounds of shelled nuts a year. The crop, which represents 100 percent of U.S. almond production and 75 to 80 percent of world production, was valued in 2011 at $3.87 billion, surpassing table, wine and raisin grapes, which were valued at $3.86 billion.

"Even with this record production, we have more demand than we have supply,” says Bob Curtis of the Almond Board. "The driver behind that is nutrition studies that show almonds are a healthy food and snack.”

A tremendous amount of UC research is behind the California almond success story, says Bruce Lampinen, UC Cooperative Extension specialist in the Department of Plant Sciences at UC Davis, an expert in almond canopy management.

"Higher density plantings of almonds and a trend towards less pruning, and improved water management have led to much higher yields,” Mr. Lampinen says.

Many almond growers have replaced flood irrigation with micro-sprinkler or drip irrigation, says Larry Schwankl, UC Cooperative Extension specialist in the Department of Land, Air and Water Resources at UC Davis. These irrigation systems increase the precision of water and fertilizer application. Over the years, UC Cooperative Extension advisors and specialists established demonstrations of micro-sprinkler and drip systems in many parts of the Central Valley and reached out to farmers to show how they could be managed to optimize production.

"Twenty years ago, we simply guessed at the amount of water that the trees needed and we applied it on a calendar basis,” says Joe MacIlvaine, president of Paramount Farming Company in Kern County, one of the state's largest growers of almonds, pistachios and pomegranates. "Today, we are delivering water and nutrients directly to the root zones when they are needed.”

Two decades ago, a granular form of nitrogen fertilizer was generally applied to almond orchards in the fall to allow winter rain and irrigation to move it into the soil for use by the trees in spring and early summer. Nitrogen use efficiency was believed to be about 40 percent. Now, nitrogen fertilizer is applied through the irrigation system during the growing season, when the tree needs it.

"Today, our nitrogen use efficiency can be as high as 85 percent,” says Blake Sanden, UCCE advisor in Kern County, an irrigation expert. He and Patrick Brown, UCCE specialist in the Department of Plant Sciences at UC Davis, have conducted nitrogen trials in almonds with Paramount Farming.

"When you increase the conversion of applied nitrogen fertilizer to higher crop yield, there is significantly less potential for nitrogen to leach below the rootzone and contaminate groundwater,” Mr. Sanden says. "But each field is unique and requires site-specific management to achieve these high levels of efficiency.”

Another area where UC research has led to significant crop yield growth is in canopy management and tree spacing. Research by Mario Viveros, UCCE advisor emeritus in Kern County, and other scientists showed that a tendency among growers to over prune was taking a toll at harvest time.

"A lot of farmers who are now growing almonds had experience with fresh fruits, where you do need to prune to get light on the fruit for good color. In almonds more canopy generally means more yield,” Mr. Lampinen says. "Today, most almond growers only prune when branches are growing in the way of tractors or other equipment.”

UC research also found that orchards planted with traditional wide spacing between the trees weren't making the most efficient use of sunlight on the farms. Older orchards had 60 to 70 trees per acre. Today, almond orchards are planted at an average density of about 110 trees per acre based on results of UC research.

However, studies have also shown that crowding still more trees into orchards triggers diminishing returns. In almond production, the nuts are shaken from the trees to dry on the ground before they are harvested.

"If the orchard floor becomes too shaded by trees planted too densely, the orchard floor temperature and humidity become optimal for growth of pathogens that could become a food safety problem,” Mr. Lampinen says. "You want enough sunlight to hit the orchard floor to reduce potential pathogens, like salmonella.”


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