Govt looks to new tech to curb crop burning and cut smog

Published December 8, 2020
A mulcher is attached to a tractor to mix stubble into the soil. It is an alternative for disposing of stubble without burning — Photo by Tahir Wattoo/File
A mulcher is attached to a tractor to mix stubble into the soil. It is an alternative for disposing of stubble without burning — Photo by Tahir Wattoo/File

Air pollution is a long-standing problem in Pakistan, but every October and November contaminates in the air in Punjab shoot up as farmers burn rice stalks left behind after harvesting to clear their fields to plant wheat.

During these cooler months, Lahore, which is surrounded by rice-growing districts, is covered with thick smog.

“It is a health emergency the air quality monitors in Lahore routinely show hazardous levels in November,” said Farah Rashid, a climate and energy programme coordinator for green group WWF-Pakistan.

Read: Study identifies relationship between smog and rice residue burning in Punjab

Now, the Punjab government hopes to tackle the problem by providing 500 rice farmers around Lahore with a set of machines that together eliminate the need to burn crop stubble.

The machines include a shredder that breaks down rice stubble and mulches it into the ground and a seed drill — called the Happy Seeder — that follows to sow wheat through the mulch.

“It's a useful technology,” said farmer Aaamer Hayat Bhandara, who has used both machines at a friend's large farm, and has pushed the government to subsidise them.

“These machines used together could really make life much easier for us farmers,” said Bhandara, from Pakpattan.

Malik Amin Aslam, special assistant to the prime minister on climate change (SAPM), called air pollution a “silent killer” and said Lahore's smog had increased in intensity and frequency over the last five years.

He explained that rice farmers traditionally use combine harvesters to cut their rice in October, leaving behind about four inches of stubble.

With less than two weeks before they have to ready their fields to sow wheat, burning is the fastest way to clear the land, he told the Thomson Reuters Foundation.

Rice is grown on an area of about five million acres, mainly in Punjab and Sindh. Many of the fields are cleared by burning every year.

In October and November, Lahore's Air Quality Index level can jump to over 300, a number that the United States Environmental Protection Agency says corresponds to a “health warning of emergency conditions”.

Cutting emissions

Farmers say the new farm equipment can help combat smog, but note that crop burning produces only a small share of the province's pollution.

“The stubble is burned only for a few weeks in the winter. It is a fact that the problem becomes worse during this short period,” Bhandara said.

“But farmers are not the only reason for this pollution,” he added.

A 2018 report by the United Nations Food and Agriculture Organisation (FAO) on the underlying causes of smog in Punjab noted that agriculture — mainly rice residue burning — accounts for 20 per cent of total air pollutant emissions.

That puts it behind industry, which produces a quarter of the air pollution in the province, and transport, which contributes more than 40pc.

Tackling air pollution — and leaving stubble on the soil as mulch, rather than burning it — also has the benefit of reducing carbon emissions that contribute to climate change.

In India, where farmers have been using the rice stubble shredder and Happy Seeder for the past few years, a group of scientists published a report last year stating the technology could cut greenhouse gas emissions by as much as 78pc.

Ejaz Ahmad, an environmental expert with the Institute of Urbanism in Islamabad, said any efforts to curb air pollution will benefit Pakistanis.

“The Happy Seeder seems like a useful machine,” he said.

Chosen by lottery

In Mandi Bahauddin district, where the famed Basmati rice is grown, Muhammad Afzal, an agriculture officer at Punjab's Government Agriculture Seed Farm, has been experimenting with the Happy Seeder for the past two years.

“Stubble management is a serious issue for farmers,” said Afzal, who helps farmers adopt new farming techniques.

There are penalties for rice stubble burning, including fines of up to Rs20,000 per acre — but most farmers have little other choice and simply continue the practice and pay the penalty when they are charged.

But a growing number are looking for alternative solutions, Afzal said.

The total cost for the stubble shredder and Happy Seeder is about Rs637,500, and the government this year is paying about 80pc of the price for 500 farmers, he noted.

“For those who can't afford it, bigger farmers are willing to rent out the machines. In the future, more service providers will come up to rent them out,” Afzal said.

One drawback to the machines, he noted, is the need to mount them on the back of a tractor — and not just any tractor will do.

“It requires a large, 85-horsepower tractor,” he noted, something most rice farmers in Pakistan do not have.

Bhandara, the farmer in Pakpattan, said the subsidised machines also are only available in certain districts around Lahore, in the so-called smog “red zone”.

“The subsidised machines should be made available to rice farmers in South Punjab and Sindh as well, otherwise they are too expensive for most farmers,” he said.

Despite the limitations, the Happy Seeder has proven so popular that the government has had 10 applicants for each of its 500 machines, according to SAPM Aslam. He said authorities are using a lottery system to decide who gets the subsidised equipment.

The government has plans to expand the Happy Seeder programme next year and cover the whole of the Punjab rice belt by 2023, Aslam noted. In the meantime, he added, it is already working on a technology upgrade.

“The agriculture extension department has developed a prototype to combine the two shredder [and] seeder machines into one 'Pak Seeder', which will be even more effective and efficient” — plus 30pc cheaper, he said.

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