Kenya's 2021 tea export earnings rose 13 per cent to Sh136 billion compared with a year earlier, helped by rising export volumes, official data shows.
"We are getting Sh120 billion (from tea earnings) now, but we can get Sh300-Sh400 billion by merely adding value... period!" said the President.
Tea exports are one of Kenya's biggest sources of foreign exchange alongside flowers, other horticultural exports, remittances and tourism.
Kenya is the biggest exporter of black tea in the world - a crop that offers a livelihood to thousands of small-scale growers who often complain of low earnings.
Top buyers of Kenyan tea include Britain, Afghanistan, Egypt, Sudan and Pakistan.
Government officials have also been holding marketing trips to Asia in a bid to increase sales of the commodity to countries like China.
The port of Mombasa hosts a weekly auction - the largest in the world - of tea produced in East African countries, including Kenya, Uganda, Burundi, Rwanda and Tanzania.
Tea revenues help support the Kenyan shilling amid pressure from a biting dollar shortage.
China and Sri Lanka are the world's top tea exporters.
Even as export earnings rise, proceeds are spread more thinly, with the number of smallholder farmers increasing.
Most of the farmers are members of the Kenya Tea Development Agency (KTDA).
Multinationals such as Williamson Tea Kenya and Unilever are also big players in the local tea industry.
President Ruto said the government will create a conducive environment for the manufacturing sector to flourish.
He said the government will invest in value addition and agro-processing, noting they have the potential of creating jobs for millions of youths.
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He challenged manufacturers to fill the gap by carrying out value addition on agricultural products to allow farmers to earn more.
Manufacturers at the forum called for tax reforms and access to affordable energy to grow the sector.
"There are huge opportunities in value addition," said Kenya Association of Manufacturers Chairman Rajan Shah.
"For instance, if we increase our value addition from the tea sector from the current 3.7 per cent to 50 per cent, this would translate into 80,000 new jobs. On the other hand, 80 per cent value addition by 2025 on leather from the current three per cent would translate into 86,000 jobs."