감초를 이용해 흙을 되살리는 방법

In the harsh climate of northwestern Uzbekistan, farmers are cultivating wild licorice on land that is salt-ridden near drainage canals.

The tops of the shrubs, established either from roots or seed, are cut for livestock fodder and, by the third year, some farmers dig up the roots to export for profit to Japan, South Korea, and the Ukraine. Extract from licorice roots is used worldwide in medicines, candy, food, alcohol and even cosmetics.

Dried licorice tops are fed to livestock in the winter. Photo: Andrew Noble/IWMI

Today, the CGIAR Research Program on Water, Land and Ecosystems (WLE) also is eyeing licorice as a potential low-cost option to rehabilitate soil stripped of its fertility because of high salinity. Farmers in the region already have abandoned an estimated 30,000 hectares of land degraded by over-irrigation in the Aral Sea Basin to support a cotton and wheat economy dating back to the Soviet era. Licorice is a salt-tolerant plant that not only thrives in such tough conditions but helps regenerate the soil.

“The key is the deep-rooted nature of licorice and its ability to drop the water table, thereby preventing salt from rising to the surface of the soil,” says Andrew Noble, Director of the CGIAR Research Program on Water, Land and Ecosystems and a soil scientist by background. In effect, salt collected in the soil is gradually flushed out, enabling the land to be irrigated again for wheat and cotton.

Noble was involved in a similar project less than a decade ago in southern Uzbekistan but, despite promising results, funding stopped after four years. Interest re-kindled during a breakfast conversation last April between Noble and Karen Brooks, Director of the Policies, Institutions and Markets (PIM) CGIAR Research Program, at a conference in Dublin.

“Licorice is endemic to the region,” Noble says.  “When you speak to farmers, they say, ‘I knew it (licorice) growing up.’”

Read the report: Remediation of Abandoned Saline Soils in Central Asia 

Assessing the global markets for licorice 

PIM, led by the International Food and Policy Research Institute, and WLE are funding a project to map licorice production in the Nukus district of northern Uzbekistan, assess other potential sites, and examine the market potential within the global context. The research will assist the government of Uzbekistan in a range of land rehabilitation initiatives planned and financed by the World Bank and Global Environmental Facility for the region.

“We think these are just cottage industries (today),” Noble says. “That’s why it’s important (for PIM) to look at these markets” before promoting the industry.

“This is a very exciting initiative, and it shows the pay-off to partnership,” Brooks says. “Neither WLE nor PIM could do this as well separately as we can do it working together.  And we need the implementation partners, as well — the farmers, local research institutes, and financing partners.”

Several farmers are interested in establishing licorice on salinized land and WLE is planning to monitor water tables and salinity on a 100-hectare site that will be established by one of these farmers.

Irrigated farmland affected by high salinity

Salt affected land to be established to licorice. Photo: Andrew Noble/IWMI

Worldwide, an estimated 34 million hectares of irrigated farmland are affected by high salinity, representing 11 percent of the total irrigated land, according to the U.N. Food and Agriculture Organization. If these lands were rehabilitated, they could effectively produce 20 percent of the global wheat production, Noble estimates, which could generate an additional $42 billion of revenue a year.

“When you look at the problem (of high salinity), it’s massive across Central Asia,” Noble says. “The options farmers have are either to abandon their land or invest heavily” in expensive drainage systems.

While licorice could be a low-cost land rehabilitation option in Central Asia, other salt-tolerant varieties of sorghum, millet and alfalfa might be appropriate in some of these ecological zones, Noble says.

Licorice production in Northern Uzbekistan

In a field trip to Nukus earlier this month, Noble found wild licorice fields being cultivated in three-meter-wide strips along the banks of drainage canals.

Scientists with the Tashkent Institute of Irrigation and Amelioration told Noble that the most significant issues facing the region are high-saline water and reduced flows from the Aral Sea. Because the land is flat and water tables have been elevated by intensive cotton and wheat farming, water moves slowly, allowing salt to collect in the soil.

Noble says he saw evidence salt had accumulated on the surface of the soils in the area. Farmers commented that not only did licorice shrubs thrive, but the higher the salt content of the soil, the higher the quality of the roots. Licorice roots contain a natural sweetener called glycyrrhizin.

Some farmers are using the plants for livestock fodder only, while others have been exporting the roots for the past three years.

One farmer indicated he made between $250 and $300 per ton of dry root, accounting for 80 percent of his farming profits. He was able to get government approval to grow licorice on a 100-hectare plot considered outside the government cotton and wheat plan.

Challenges to overcome

“An interesting aspect that came out of discussions with these farmers is they make no money from their production of wheat” and often scramble to break even or make a small profit from cotton, Noble says.

Challenges must be overcome to cultivating licorice for profit and land rehabilitation.

Farmers may have to get permission from the government to grow the licorice in the abandoned areas, since irrigated farmland is designated for cotton and wheat.

As the licorice crop grows out, roots spread and dominate an area. Herbicides may be necessary to manage the “weediness” of the crop, Noble says.

The seeds are extremely small and farmers reported they are only able to get about 20 percent of the seeds established into plants – they asked for and might need assistance to more efficiently cultivate their crop through seeding or root cuttings.

Farmers also said they harvest roots manually and that production increases would be contingent on mechanizing the process.

Evidence in favor of licorice is mounting

This isn’t the first time researchers have examined licorice’s potential to rehabilitate degraded lands.

Between 2005-2008, researchers from the International Water Management Institute (IWMI) examinedlicorice in southern Uzbekistan in a project funded by the Asian Development Bank.

Researchers tested two small plots at Gulistan State University in Syr Darya province – one a control plot and the other cultivated with licorice. They demonstrated that the salt content in the licorice plot declined enough to return to a cotton/wheat crop rotation after four years.

IWMI recommended that the government release abandoned lands for 15 years to enable farmers to make some money before turning the land back over to cotton and wheat production.

But further support for the project wasn’t forthcoming. Now comes another opportunity.

“This could be a flagship investment model,” Noble says. “We’re not talking about expanding (farmland). It’s there. The beauty of this is that you’re taking land that’s been abandoned and making it productive once again.”

 

About the Author:

Jeff Smith has worked as a journalist and media development trainer for more than 25 years in Asia, Africa and the United States.

http://wle.cgiar.org/blogs/2013/10/29/sweet-solution-licorice-could-reclaim-degraded-lands/