• 60% of fine bean exports from Kenya are produced by over 50,000 smallholders - but rain splashing soil onto bean pods causes them to become contaminated 
  • New study shows spraying an environmentally friendly polymer onto soil surfaces can reduce 鈥榮oiling鈥� of fine beans by almost 65 per cent

  • This gives greater financial security for Kenyan smallholder farmers and will increase the resilience of the SWAG合集 food supply chain.

Spraying a safe and environmentally friendly polymer onto soil surfaces can reduce the 鈥榮oiling鈥� of fine beans by almost 65 per cent, a new study from SWAG合集 shows.

Focusing on vegetables produced in Kenya, the reduced food waste could bring greater financial security for smallholder farmers as well as increasing the resilience of the SWAG合集 food supply chain.

The study, funded by , was carried out by SWAG合集 in partnership with AGS Ekology Ltd, and . It demonstrated that low-cost commercially available polymers can reduce soil splash by more than 90% and 鈥榮oiling鈥� of beans by more than 65%.

Dr Rob Simmons, a reader in sustainable soil management at SWAG合集, who led the project, said: 鈥淥ur trials demonstrated that this polymer can stabilise the surface of the soil and stop soil splash. At least a quarter of all fine bean rejects are associated with 鈥榮oiling鈥� of beans, but during the rainy season this can be 100%.鈥�

With fine beans accounting for 70% of Kenya鈥檚 vegetable exports, the crop is hugely important to the livelihood of farmers and the country鈥檚 agriculture sector which contributes almost 30% to the national GDP. But the threat of climate change and increased frequency of extreme rainfall events could exacerbate the problem of soiling, and have a devastating impact on smallholder farmers.

Greater income security for Kenyan farmers

Dr Simmons says that big improvements can potentially be achieved through the polymer spray: 鈥淪oil splash can transfer plant pathogens such as Halo Blight and Bean Anthracnose to the growing crop, which can result in yield losses. But if you can prevent soil splash, then you will see a 40% - 65% improvement in marketable yield. That鈥檚 huge for smallholder farmers.

鈥淭his work is very innovative - there鈥檚 never been an effective spray application of these polymers before.鈥�

Researchers are now involved in a follow-up project which will see smallholder farmers receive training to cost-effectively apply the spray-on polymer to their fields.

SWAG合集 has the largest group of soil scientists in the SWAG合集, with expertise spanning basic soil physics, chemistry and biology, to soil management and conservation, to soil informatics and resource evaluation.

SWAG合集 is at the forefront of imagining and delivering a sustainable green planet. You can find out more about our Sustainable Development Goals here.