Visiting Kenya was a landmark event in SoilCards development. It’s the first time that our prototype was in the hands of customers. Luckily it was a hit with the farmers we spoke to, with one even saying “we need these yesterday!”
The work of small-scale farmers is vital, producing ~70% of global food supply. But these are some of the poorest people on earth, with over 1 billion living below the poverty line.
SoilCards are the devices that we’re developing to make soil-nutrient analysis easy, quick, and affordable to smallholder farmers who don’t have access to soil-testing laboratories. SoilCards are made entirely of paper, so they’re ultra cheap and portable. They’re inspired by the home pregnancy test, so they’re easy to use and read. They use microfluidic technology which we’ve translated from medicine to agriculture, but so far they’ve been a proof-of-concept device which has been developing in the lab.
Up until this trip, we had been designing and building SoilCards in London, far away from our intended users (smallholder farmers in developing countries). We had tested ideas with UK farmers, but African farming is very different. Thanks to a grant, we were finally able to travel abroad to understand the context that SoilCards will be used in, and get feedback directly from our users. We chose Kenya partly because of existing links between our partners, the UK’s National Institute of Agricultural Botany (NIAB) and the Kenyan Agriculture and Livestock Research Organisztion (KALRO). There are also three important characteristics that helped us choose Kenya:
Really positive response from our first farmers today! Alex said "We need this yesterday". pic.twitter.com/60SJ8e4l42— SoilCards (@soilcards) September 22, 2017
Having never been to Kenya, we had a long list of questions for our trip, including:
Agrovet shops like Pauline’s could be a way to get SoilCards to farmers. She sells fertiliser, seed, pesticide, feed & offers farming advice pic.twitter.com/1CXCcTuGOz— SoilCards (@soilcards) September 23, 2017
Traveling from the UK was myself from Science Practice leading the project, and Eric Ober from NIAB, who has a wealth of knowledge about UK agriculture and soil health. Our hosts from KALRO in Kenya, whom we spent all 8 consecutive days with, were Joseph Mriti, Esther Muriuki and John Mwangi. Joseph, Esther and John are agricultural scientists based at one of KALRO’s Nairobi offices. Not only are they experts in soil science and farming intervention studies, but crucially they are experts on Kenyan farming in particular.
The team in Kenya, in the Great Rift Valley. From left to right: Tempest, Eric, Joseph, John and Esther.
In Kenya we spoke to stakeholders from across the spectrum of soil testing:
Today we visited Mea fertiliser manufacturer who test soil & make a custom nutrient blend based on the results, very impressive! pic.twitter.com/cGejiEpL8A— SoilCards (@soilcards) September 25, 2017
In Kenya, almost all farming is done by smallholders. According to the FAO, the average income in these households is $1.40 per person per day. The smallholder farmers we spoke to ranged in age and income level. While most had small plots of one acre or less, and were struggling to make a living, some had larger farms of a few acres and had other people working on their land. Many farmers were self-taught or were taught how to farm by their community, rather than ever receiving any formal training or advice. Most farmers sell their produce at their local market. Their main challenge is low/fluctuating market price for their crops, which makes it hard to cover the cost of farm inputs like fertiliser.
We spoke to Naivasha farmers who’ve never tested their soil. Rely on intuition & collective experience to apply the right fertiliser pic.twitter.com/LVY94ogP6N— SoilCards (@soilcards) September 27, 2017
## Prototypes There was lots of uncertainty around the timing of the trip, which was delayed by the anxiously anticipated 2017 general election in Kenya. However as soon as we got the go ahead for the trip, we worked tirelessly in the lab at Imperial College to make a whole box of prototype SoilCards by hand:
Looking back at all those hours in the lab, getting SoilCards ready for our first trip to Kenya! pic.twitter.com/7hSvtRCvsP— SoilCards (@soilcards) September 20, 2017
We brought along prototypes that closely mimic how SoilCards will work in future, to demonstrate to different stakeholders. The demo involves placing some soil into the SoilCard and adding water, and after a few minutes spots on the display begin to appear. When the blue bar at the end changes to pink, the test is ready to read. The number of spots is compared to the reference card. After demonstrating it once for them, the stakeholders were given a chance to try it for themselves.
After a pipetting marathon in the lab, we've got a big batch of SoilCards prototypes to test with farmers in Kenya, in just a few weeks! pic.twitter.com/4k7tnlwOVk— SoilCards (@soilcards) August 30, 2017
We insisted on doing farmer interviews on their farms, rather than meeting at say, a school, which is a normal community convening point. This was to give us a chance to observe the surroundings and see exactly what conditions Soilcards will be used in: for example, the brightness of sunlight, availability of shade and shelter or places to store possessions, and quality of roads and transport options (boda boda!). There were two occasions when we asked for water for the demo (water is required to use soilcards) and it was scooped up in a banana leaf. Without being there in person, there would have been no way of knowing that a banana leaf is the most handy vessel for a farmer to carry water in. For the same reason, we met soil scientists at their laboratories, fertiliser manufacturers at their factory, and shop owners in their stores.
“You only have to try it once, and then you can teach other farmers how to use it.” “It’s empowering to be able to test your soil yourself.” pic.twitter.com/NFu2xZwroc— SoilCards (@soilcards) September 23, 2017
I was honest about being an engineer who doesn’t know much about farming, and my reason for being there was to learn from farmers. We told farmers that we are building the product for them, so we wanted to hear from them how to make it better. It’s hard to know for sure whether our interviewees were just being polite, but we tried to avoid yes/no questions framed in a positive way, like “Do you like SoilCards” by asking instead “What (if anything) would change life on the farm if you had SoilCards?”.
We had originally planned to interview farmers one at a time or in small groups. However bigger groups gathered and we didn’t want to turn enthusiastic people away, so we just went along with it. We had spent days writing detailed questionnaires, but in the end, having a chat seemed much more natural. I tried to maintain an open, honest, relaxed and collected composure, even when I stepped into a muddy irrigation channel, disturbed a nest of soldier ants, and had a little girl hugging my calf during a demonstration.
The response to SoilCards was overwhelmingly positive. Farmers were intrigued by the devices and were delighted when the spots appeared. They could immediately see the value of knowing nutrient levels before buying fertiliser. After one demonstration they spontaneously started explaining SoilCards to other farmers in the group, and almost every farmer wanted to buy or keep the SoilCards (of course I reiterated that these were just prototypes, not a finished product).
• Attitude to soil health: The farmers we spoke to all understood the importance of soil health and regularly applied fertiliser (organic and mineral), and crop rotation was fairly common practice too. They knew that soil testing was important but said that it was too expensive, and delivering the soil sample required too much effort. To understand soil health, farmers observe how well crops are growing, but this is a costly and lengthy experiment. They tend to apply the same fertiliser that they always have, adjusting it intuitively based on growth. Because SoilCards make soil nutrition visible, farmers instantly recognised that they would take the guesswork out of estimating soil health, and would help them avoid spending money on fertilisers they don’t need.
• Product design & usability: The farmers we spoke to found the spot display easy to understand, and we noted small language modifications like referring to acidity rather than pH. At the end of all the interviews we had a workshop to decide the easiest way to communicate the actions a farmers should take after a test: what fertiliser to buy. We were consistently told that the card should be bigger which was not surprising; engineers in the lab tend to want to make things as small as possible, and farmers hands are larger than ours. One piece of very honest feedback we got was that the dark pink spots looked like drops of blood, an off-putting connotation which we will try to fix.
• Connectivity: Most farmers we spoke to had a mobile phone and access to somebody with a camera phone, but few had smartphones. The M-Pesa payment system is widely used. They were keen to photograph the test result and send it if they could get a detailed interpretation back.
• Distribution: Different stakeholders had different opinions about how best to get SoilCards to farmers. Some farmers favour a free market approach and would prefer to buy SoilCards directly from the agrovet stores where they buy fertiliser. Some agricultural researchers felt that SoilCards would deliver most impact if distributed within a farmer training program. We will probably explore a variety of distribution channels and see which ones have the most impact.
The most popular agrovet in town, each person holds an agronomy degree so they provide expert advice & help interpret soil test results pic.twitter.com/dsIsVfy0FF— SoilCards (@soilcards) September 23, 2017
Discovering new customers: We discovered two new customers on our trip. Both have an interest in increasing farmer productivity and already pay for soil testing:
SoilCards can facilitate dialogue: We discovered a new use for SoilCards, which is to allow a more meaningful discussion between farmers and anyone who wants to increase farmer productivity. Advice about managing soil nutrients is much more convincing, engaging and persuasive if farmers can see results of the their actions. We spoke to one soil scientist and adviser who goes to check up on farmers. She said that she would like to include SoilCards in discussions with farmers because it would make soil testing much more tangible to them. She said that she sets off each day with a backpack for her equipment and lunch, and the best way to get to farms is on a Boda Boda motorcycle taxi. She has to be very selective about what she carries in her bag, but because SoilCards are so small and light she could easily bring them on her visits. We learnt that it is crucial to calibrate the SoilCards display spots to Kenyan lab standards so that the spot display can be interpreted by both farmers and scientists, which facilitates a seamless discussion.
We were told by our hosts that our approach was unusual in that we brought early-stage technology to demonstrate, rather than a finished product, which is the norm. They said that this worked well because it meant that farmers and other stakeholders are involved in the design and development process. This is much more likely to result in a product that farmers will use.
Demonstrating SoilCards to KALRO Kabete staff with range of expertise e.g. irrigation, agrochem, livestock. Great to involve students too! pic.twitter.com/RO7Ib9xZju— SoilCards (@soilcards) October 3, 2017
We are currently looking for funding to continue developing SoilCards. Our trip has demonstrated demand for SoilCards, so we need to go back to the lab to refine our prototype and turn it into a fully functioning product. Ultimately our goal is for SoilCards to be a social enterprise which can sustain itself through sales of an ultra-affordable product. Please get in touch if you know of any funding opportunities!.
In the longer term we see huge potential for farmers to photograph their test result and get more detailed recommendations back by SMS. This could include information about what specific fertiliser products are currently available at the shops. The discrete spot display will be trivial to count and digitise, whereas colour hue from a traditional chemical test is notoriously difficult to determine using computer vision. Test results could also help build up a detailed map of soil health which could be very useful for government and anyone wanting to monitor and improve farm productivity. Lastly, there is not reason why SoilCards couldn’t work beyond Kenya, and we hope it will make an impact on farmers in other parts of the world too.
We are very grateful to our hosts and research partners at KALRO who did a fantastic job making everything run smoothly. There was an incredible amount of preparation leading up to the trip, and they worked with us for 8 straight days without a break. They were enthusiastic and hospitable and flexible when we wanted to do things differently. We could not have done it without them.
We are also extremely thankful for all the time that each and every stakeholder interviewee gave to us, and for their invaluable, honest feedback.