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STOCKTON, Calif. -- Driving by an asparagus field, you'd never guess it was such a demanding crop. In fact, you might not even know it was planted at all. If you didn't know better, all you'd see would be acres of deeply plowed earth. Because the spears need soft earth and no competition from other plants, even during the peak of the season, asparagus fields tend to look like they've never been planted.

And the way things are going, who knows in a year or two whether they will be? The California asparagus industry, which grows 80 percent of the nation's fresh asparagus, is in crisis, upended by the gales of global trade. After a string of money-losing harvests, farmers have slashed acreage by one-third in the last three years, from 36,000 acres to 24,000, and there is no end in sight.

Families that have been growing asparagus for four generations are facing the possibility they might have to get out of the business altogether. A historic piece of California's farming culture is slipping away.

At the root of the problem is the nature of asparagus itself, which demands as much hand-cultivation and as careful harvesting as the grapes for some rare wine. Asparagus spears grow from clumps of roots called crowns that are buried four to six inches below the surface. They grow amazingly fast. When the temperature gets into the 70s and 80s, asparagus can shoot up as much as seven inches in 24 hours. Early in the season, say late February to early March, farmers can get by with cutting a field every other day. The rest of the time, it must be done daily, or the spear tips will feather into ferns.

As vigorous as it is, asparagus has a fragile side too. Anything that gets between a spear tip and the air can deform it. The soil must be extremely soft and loose. Even the slightest crust can cause the spears to bend.

A recent study commissioned by the California Asparagus Commission spells out the implications: Every year, every furrow in every asparagus field must be worked 15 to 20 times -- and that doesn't include as many as three months of daily harvesting.

Although many crops can be picked by machine in one pass, asparagus must be harvested by hand and in repeated passes.

Workers walk the furrows, judging each spear to see whether it is long enough to be cut that day. To be considered, a spear must be at least 9 inches long. Thrusting an 18-inch blade that looks something like an overgrown weeder deep into the top of the ridge, workers cut off the spear just above the roots, but without damaging the crown. This takes skill.

"A good crew will do more than cut, it will manage the field," says Marc Marchini, a third-generation asparagus farmer and chairman of the California Asparagus Commission. "They'll cut just the long spears and leave the rest for the next day or the day after."

The bottom line for all that handwork, farmers say, is that labor accounts for 75 percent to 90 percent of the cost of growing asparagus.

Even though field workers don't earn much for such hard work -- growers say top wages at the peak of the season are $75 to $80 a day -- it is still far more than what is paid in Mexico and Peru, the United States' two largest competitors.

As a result, imports of fresh asparagus have soared 40 percent in the last five years, while the average amount earned by California farmers has plummeted. In 2002, farmers averaged only 80 cents a pound for fresh asparagus, well below the $1 a pound they say they need just to break even.

Eddie Zuckerman, president and chief executive of Zuckerman-Heritage, one of the state's largest growers, says that his company has cut asparagus acreage nearly in half and that if the market doesn't turn around soon, it will slash even more.

Zuckerman says total acreage for the state might have to go below 20,000 before asparagus becomes profitable again.

The California asparagus industry is centered in the peaty soil of the Sacramento-San Joaquin River Delta area -- the same black-earthed islands where it was born 150 years ago.

For most of its history, the emphasis was on asparagus destined for canning -- to the majority of Americans, the vegetable was an exotic, used only in composed salads, much like hearts of palm. There were as many as 10 canneries operating in the area in the 1920s.

At its peak in the 1950s, the delta boasted more than 75,000 acres of asparagus -- more than three times what is grown in the entire state today -- and more than half of that was canned.

Asparagus begins to send up spears only when the ground is sufficiently warm. In the San Joaquin Delta, that's usually late February to early March. It's over when the warm weather causes the spears to turn to ferns too quickly, usually around the end of May.

Traditionally, California farmers have angled to get in the first crop, as that was the one for which asparagus-starved consumers were willing to pay the most. But with Mexico and Peru now in the picture, the market has been flooded with asparagus by the time even the earliest California fields begin to produce.

Because of Peru's mild climate, it can produce asparagus nearly year-round, and that has exacerbated California farmers' problems.

Of course, good cooks know that the best-quality ingredients are always the ones found closest to home. Out-of-season imported produce -- whether it is Chilean peaches in December or Peruvian asparagus in August -- can't compare in quality, and it decreases the appreciation for home-grown.

"Because of the proliferation of acreage offshore, I think the nation's appetite has become sated," Zuckerman says. "Asparagus used to be something you only ate in the spring. Mexico and Peru have made asparagus available virtually year-round.

"Not only that, the other major thing is that they're taking away our other outlets. During previous low cycles, we had Asia to take the excess off our market to help support the price. Those diversions have pretty much evaporated. I was hoping that with the soft dollar, exports would be a little more lively this season, but to date I haven't seen that happen."

Things could get even worse if China, which grows more than 85 percent of the world's asparagus crop, enters the global market.If that happens, it will not only take away some of American growers' most important markets (even in a down cycle, Japan annually buys more than $13 million worth of U.S. asparagus), it also could bring a tidal wave of asparagus.

When the price drops, the asparagus doesn't stop growing just because of economics. Instead, farmers have a choice of losing money on picking and packing or disking the tops of their fields, knocking down the developing spears and putting the acreage out of production for as long as two weeks -- a significant span considering the shortness of the asparagus season.

Faced with those alternatives, it's not surprising that some farmers have chosen to give up on the crop altogether and to plow their fields under. Because asparagus is a perennial plant that needs three years in the ground to get to productive size, this is done only in the most dire of circumstances.

But if things don't turn around, Zuckerman says, that will be the only alternative.

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