In Pakistan’s Chilli Province, Growers Turn to Innovation Against Toxin Contamination
Aflatoxin, toxic byproduct of mold that spreads on crops during production, harvest, storage or processing, has hit chilli crops in southern Sindh province
Twelve growers with the help of a government institute have installed drying machine, solar tunnel and dehydrator to mechanize drying and washing chillies
— Zulfiqar Kunbhar | November 21, 2023 | Arab News
UMERKOT, SINDH: A dozen growers in Pakistan’s southern province of Sindh are successfully using modern methods and machines to protect their chilli crops against fungal contamination in a region that is highly vulnerable to climate change and ranked among the top five in the world for chilli cultivation and production.
Around 150,000 acres (60,700 hectares) of farms in Pakistan produce 143,000 tons of chilli annually, making the country the fourth largest for chilli production worldwide. Sindh, which produces 126 million tons, contributes around 88 percent of the country’s total chilli production.
But floods that wreaked havoc across Pakistan last year, on the back of several years of high temperatures, have left chilli farmers struggling to cope. In a country heavily dependent on agriculture, the more extreme climate conditions are hitting rural economies hard, farmers and experts say, underscoring the vulnerability of swathes of South Asia’s population to changing weather patterns.
In recent years, contamination by aflatoxin — a toxic byproduct of a mold that tends to spread in drought-stressed crops during production, harvest, storage or processing — has also hit chilli crops in Sindh.
Dr. Muhammad Siddique Depar, the principal scientific officer at the government’s Arid Zone Research Center (AZRC) Umerkot, said chillies traditionally needed to be air-dried outdoors for two weeks but increasingly higher daytime
In this photograph, taken on November 13, 2023, Dr. Muhammad Siddique Depar, the principal scientific officer at a research center, showcases dried red chilies using a drying machine in the Umerkot district of Pakistan's Sindh province. (AN Photo by Zulfiqar Kunbhar).
temperatures and inconsistent dew were creating favorable conditions for aflatoxin growth during the process of drying. The rest of the damage was done by dust in the outdoors, which collected on the chillies as they dried.
“Over the past three years or so, AZRC has installed a foreign-donated red chilli drying machine, a solar tunnel, and a chilli dehydrator drying and washing machine,” Depar said, explaining the modern methods being used by twelve growers to combat aflatoxin contamination.
Compared to two weeks in the open air, chillies can dry in four days inside a solar tunnel and within 30 hours with a dryer. Both methods also prevent the chilli crop from being exposed to dust, which is the main reason for a decline in quality, Depar added.
“After the area’s [12] growers utilized these facilities for drying fresh chilli crops, achieving better results compared to open-sky drying, we can say it proved to be a successful model,” the researcher said.
Worker spreads red chilies for drying in the Umerkot district of Pakistan's Sindh province on November 13, 2023. (AN Photo by Zulfiqar Kunbhar)
But the machines are not adequate to meet the demands of the region’s farmers.
Four red chilli dryer units and two chilli washing units were donated by the Korea Program for International Cooperation in Agricultural Technology to AZRC Umerkot. The total capacity of the KOPIA chili drying units is 20 maunds, or approximately 800 kilograms. In addition, one unit each of a solar tunnel and a solar-cum-gas-dryer were installed at AZRC Umerkot under a Pakistan Agricultural Research Council agriculture-linkage program project titled Post-harvest Processing of Chilies for Producing Quality Produce. The project started in 2018 and ended in 2020.
Now, Umerkot’s chilli growers want the government to scale up the new methods to save local chillis from contamination.
“I availed the AZRC red chilli drying facilities and it saved me time and quality,” farmer Javed Rajar told Arab News.
In this photograph, taken on November 13, 2023, farmer Javed Rajar showcases local chillis in the Umerkot district of Pakistan's Sindh province. (AN Photo by Zulfiqar Kunbhar)
“However, I am still dependent on traditional methods too as AZRC did not have that capacity to dry all my chilli crops. The issue is that for large scale production these machines are not enough.”
He called on the government to act promptly to protect the region’s famous Lungi chilli crop.
“Lungi chilli is renowned for its unique taste globally,” the grower said. “However, environmental conditions are either causing a decline in its production or it is being replaced by hybrid varieties. The government needs to act promptly by establishing large-scale chilli drying units to support local farmers and boost Lungi’s exports.”
Official figures show Pakistan’s dried red chilli exports have declined in the last few years, mainly due to aflatoxin. As per the Trade Development Authority of Pakistan (TDAP), Pakistan exported 2,751 metric tons of dried red chillies in 2019, which declined to 1,665 metric tons in 2022.
But officials are optimistic that with innovation, chillis can be protected from toxins in the future during the drying process.
“Using modern techniques helps us to manage the phytosanitary and meet food safety requirements of other [importing] countries by addressing the issues of aflatoxin and pesticide residues,” Dr. Mubarik Ahmed, a consultant for agriculture and food at TDAP, told Arab News.
“TDAP is planning to help local chilli farmers in developing more drying units.”
This photograph, taken on November 13, 2023, shows local red chilies at a farm in the Umerkot district of Pakistan's Sindh province. (AN Photo by Zulfiqar Kunbhar).
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Mushrooms Help Clean up Toxic Waste
Through a process called mycoremediation, mushrooms can be used to remove chemicals from the soil and heavy metals from water through their mycelium (one of nature’s most resilient living organisms, fire-resistant, water-retardant, vegetative part of a fungus). Research suggests that mushrooms can convert pesticides and herbicides to less harmful compounds, remove heavy metals from brownfield sites (land that was once used for industry and now lies useless), and break down plastic. The main idea of mycoremediation is to use a fungi’s natural decomposition abilities to restore and regenerate land. With fire return intervals becoming increasingly shorter and fire severity growing more intense, ecologists have started to use mushrooms to repair severely scorched soil.
Most of the breakdown of toxins/waste takes place before the fruiting body is formed.
The waste is typically fully absorbed by the fungus within a few weeks. The enzymes produced by a mushroom are able to break down a lot of different pollutants and the mycelia (mycelium plural) ‘digest’ the surface they grow on and convert it into nutrients and possibly edible mushrooms. Some species of fungi are being “trained” in labs to digest things like polypropylene face masks and plastic gloves.
Mushrooms have been used to clean up oil spills in the Amazon, boat fuel pollution in Denmark, contaminated soil in New Zealand, and PCBs in the Spokane River. Mycoremediation is a natural, more gentle, and possibly cheaper alternative to the traditional “scrape and burn” approach towards environmental cleanup (where the contaminated soil is dug up and incinerated). The traditional method can remove potentially fertile soil but mycoremediation can help clean up the toxic soil while also improving soil fertility.
Now the big question: if mycoremediation is so great, why don’t we see more of it on a larger scale?
Federal regulations require a 100% removal of the targeted contaminants within a short period of time, but we currently don’t know how effective the breakdown is when using fungi, and the speed of it. Also, each biohazard site may require a customized treatment; how a mushroom reacts to the site depends on the species, the contaminants present, and the local growing conditions. There’s also not much investment and funding in this area of science and biology, causing many scientists to seek other areas of work.
Sources: Mushrooms Clean Up Our Toxic Messes - resilience, Mushrooms Clean Up Toxic Mess, Including Plastic. So Why Aren’t They Used More? - YES! Magazine (yesmagazine.org), Mycoremediation: How Fungi Can Repair Our Land | Office of Sustainability - Student Blog (usfca.edu)
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