Zimbabwe’s Kutsaga curing barn KCC2 cuts moisture variation to 3.11%

Kutsaga’s KCC2 curing barn reached a moisture-uniformity coefficient of variation of 3.11% in comparative trials, against 5.03% for its predecessor KCC1, the Zimbabwean Tobacco Research Board reported at the 70th CORESTA congress in Victoria Falls.

The congress is organised by the Cooperation Centre for Scientific Research Relative to Tobacco. Kutsaga presented the barn as a design that improves heat and moisture distribution while cutting reliance on grid electricity.

A lower coefficient of variation means more even moisture across the leaf

The coefficient of variation expresses how widely moisture readings spread around their average, as a share of that average. Kutsaga’s trial figures put the spread at 3.11% of the mean for KCC2 and 5.03% for KCC1.

Kutsaga did not publish the number of barns or batches behind the comparison in the material presented. The trial design and sample size remain unconfirmed.

Malawi’s ARET plans to bring Kutsaga engineers in to transfer the design

Albert Changaya, chief executive of Malawi’s Agricultural Research and Extension Trust, said his organisation wants to adopt the technology and intends to invite Kutsaga engineers to Malawi to help transfer it.

That makes Malawi the first named external market for the KCC2 design, with the transfer still at the invitation stage rather than an agreed programme. No timetable or funding arrangement has been stated.

Biofertilizer trials point to a 75/75 split of chemical and biological inputs

A separate Kutsaga study tested biofertilizers as a way to cut nitrous oxide emissions from tobacco production. Combining 75% of the recommended chemical fertilizer application with 75% biofertilizer produced the most promising balance between crop productivity and emissions reduction, according to the research presented.

The finding concerns nitrous oxide, a greenhouse gas tied to nitrogen fertilizer use, rather than carbon dioxide. The congress material does not state absolute emission reductions or yield figures for the 75/75 combination.

Alternative curing fuels under discussion include LPG, briquettes and biogas

Researchers at the congress also discussed curing fuels other than the current default, naming liquefied petroleum gas, biomass briquettes and biogas. Kutsaga framed the KCC2 barn around reduced demand for grid electricity, which links the hardware question to the fuel question.

No cost comparisons, availability assessments or emissions data for those fuels were included in the material presented.

Who is affected

Growers and curing-barn operators in Zimbabwe and Malawi are the immediate audience, since barn performance determines both electricity use and how evenly a crop dries. Equipment suppliers and leaf buyers with curing operations in southern Africa face a design benchmark of 3.11% moisture variation if the KCC2 is adopted more widely.

Fertilizer suppliers and agronomists working on nitrogen management have a stake in the biofertilizer result, which proposes replacing a quarter of recommended chemical fertilizer while adding a biological product at the same 75% rate.

For manufacturers and distributors outside tobacco, the congress signals where curing technology is heading: designs judged on moisture uniformity and grid independence, with fuel substitution discussed alongside.

What happens next

Malawi’s ARET has said it will invite Kutsaga engineers to facilitate the transfer, which would turn the congress presentation into a cross-border deployment. Until that visit is arranged and trial data from Malawi is produced, the 3.11% figure rests on Kutsaga’s own comparative trials.

Questions readers ask

What is the moisture-uniformity coefficient of variation Kutsaga reported?

Kutsaga reported 3.11% for the KCC2 curing barn and 5.03% for its predecessor, KCC1, in comparative trials presented at the 70th CORESTA congress in Victoria Falls.

Is Malawi adopting the KCC2 barn?

Malawi's Agricultural Research and Extension Trust wants to adopt the technology, according to its chief executive Albert Changaya, who said the organisation plans to invite Kutsaga engineers to Malawi to facilitate the transfer. No timetable has been stated.