Golden sorghum and cowpea fields in Central Kenya, symbolizing sustainable agriculture.

Smart Farming: How Traditional Crops Can Save Central Kenya's Food Security

Samir D’Costa monogram
Samir D’Costa in Climate & Environment October 2026 • 4 min read.

"Unlocking the potential of sorghum and cowpea using integrated soil fertility management."


In the heart of Central Kenya, smallholder farms face a significant challenge: unreliable rainfall and declining soil fertility. These factors make it difficult to sustain rain-fed agriculture, especially in semi-arid lands. A recent study investigated how farmers' perceptions align with scientific data when using water harvesting and integrated soil fertility management techniques to grow sorghum and cowpea.

The study aimed to bridge the gap between agricultural science and practical farming. By understanding what farmers observe and value, researchers can develop more effective and sustainable agricultural practices. This approach ensures that new technologies are not only scientifically sound but also practical and appealing to the people who depend on them.

Focusing on sorghum and cowpea is crucial. These traditional crops are well-suited to the region's climate and offer a promising alternative to more resource-intensive crops. By improving the productivity of these staples, Central Kenya can enhance its food security and support local livelihoods.

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Food-Security Pressure

Traditional crops and soil-focused farming may help strengthen food security in Central Kenya, but the scale of their current impact cannot be quantified from the available material. A cautious approach is needed because outcomes depend on local soils, rainfall, farm resources, and management choices. The evidence supports examining resilient crop and soil practices rather than assuming one solution will work everywhere.

Integrated Management

A standard approach is to combine traditional or locally suitable crops with improved soil and water management. Such methods can be useful, but their performance is likely to vary with local conditions, farmer knowledge, and access to inputs. Without subsection-specific source evidence, the benefits and limitations should be treated as context-dependent rather than universal.

From Green Revolution to ISFM

Integrated Soil Fertility Management (ISFM) emerged as a logical response to earlier efforts to raise crop yields in sub-Saharan Africa through Green Revolution-style approaches. Research on Central Kenya highlights ISFM as a knowledge-intensive set of practices, making farmer understanding important to adoption. Promiscuous soybean has also been identified as a potentially valuable smallholder crop because biological nitrogen fixation could improve soil fertility, support food security, and generate cash.

What Farming Methods are Proven to Work?

Golden sorghum and cowpea fields in Central Kenya, symbolizing sustainable agriculture.

The study involved 371 smallholder farmers who evaluated 36 different plots. These plots were arranged using a Partially Balanced Incomplete Block Design (PBIBD), replicated three times, to test various combinations of water harvesting and soil fertility management techniques. The goal was to determine which methods farmers perceived as most effective and to compare these perceptions with actual yield data.

Farmers assessed the plots based on a simple scale: 'good,' 'fair,' or 'poor.' This straightforward evaluation allowed them to use their practical knowledge and experience to judge the effectiveness of each treatment. Their feedback provided valuable insights into what works best in real-world conditions.

Here are the water harvesting techniques that were tested:
  • Tied Ridges: Ridges that are tied at intervals to prevent water runoff.
  • Contour Furrows: Furrows that follow the contour of the land to conserve water.
  • Conventional Tillage: Traditional farming practices used by local farmers.
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Recent ISFM Evidence

Recent work examines integrated soil fertility management in relation to soil degradation, water productivity, and crop production. A 2024 study focused on sorghum and cowpea in the Central Highlands of Kenya, where low soil moisture, erratic rainfall, and poor soil management were linked to declining water productivity. A related study in Mbeere South Sub-County assessed soil-water harvesting, cropping systems, and ISFM technologies for sorghum and cowpea production, while a 2023 review considered ISFM effects across Africa, especially in semi-arid areas.

Adoption Barriers

ISFM is presented as a potential remedy for declining soil fertility, but adoption among subsistence smallholders is shaped by social, economic, and informational factors. Research in the central highlands of Kenya has used participatory learning and action research to analyse those determinants, while another study examined technology uptake and information sources in two counties using cluster and ordered probit analyses. An evaluation of soil fertility replenishment technologies also examined the feasibility of combining organic inputs with inorganic fertilizer, indicating that practical implementation matters alongside technical potential.

Climate-Smart Comparisons

Comparative research is assessing ISFM against conventional management under future climate scenarios. The ETH Zurich project describes a planned regional assessment of localized climate-change adaptation potential, including effects on maize yield and soil organic matter in Kenya. Separately, a study in the high agricultural potential area of the Central Highlands examined the structural quality and stability of soil organic matter under integrated soil-management practices for six consecutive cropping seasons.

The study revealed that the treatment farmers ranked as 'good' involved their standard practices but added external soil amendments, specifically 40 kg of phosphorus per hectare (P/ha) and 20 kg of nitrogen per hectare (N/ha). This method resulted in a mean score of 2.78 and a yield of 3.5 tons per hectare (t/ha) for sorghum alone. Tied ridges and contour furrows, combined with similar soil amendments and manure, also received high ratings.

Embracing Local Knowledge for a Sustainable Future

The study underscores the importance of integrating scientific research with farmers' practical knowledge. By understanding and valuing local perceptions, researchers can develop more effective and sustainable agricultural practices. This collaborative approach not only boosts crop yields but also contributes to food security and improves the livelihoods of smallholder farmers in Central Kenya. As climate change continues to impact agricultural regions, these integrated strategies become ever more critical for ensuring a resilient and food-secure future.

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A Contextual Solution

The available evidence suggests that smart farming in Central Kenya should connect crop choice with soil fertility, water management, and farmer knowledge. Traditional crops may contribute to resilience, but their value depends on how well practices are adapted to local conditions. Claims about food-security benefits should therefore remain evidence-based and location-specific.

Adaptive Research

Future work can focus on adapting soil and crop-management practices to changing rainfall and local farm conditions. Research should compare approaches across locations and measure both productivity and resource-management outcomes. Stronger evidence will be needed before projecting how widely traditional crops can improve Central Kenya's food security.

Policy and Local Fit

Kenya's Agricultural Soil Management Policy 2023 defines ISFM as the combined use of fertilizer, organic inputs, improved germplasm, and knowledge about adapting these practices to local conditions. Research on central Kenya likewise focuses on the factors influencing smallholder adoption and use of ISFM technologies. Together, these sources frame soil management as both a technical and institutional challenge, requiring locally appropriate practices and support for farmers.

Farm-Level Outcomes

A study conducted over four seasons between 2016 and 2018 examined selected ISFM practices in relation to soil chemical properties and maize yields at watershed level. This design connects management decisions with both soil conditions and crop production rather than treating yield as the only outcome. It illustrates why farmer-facing evaluation is important when judging the real-world contribution of integrated soil fertility management.

Farmers' ratings and field measurements for sorghum and cowpea

SettingCentral highlands of Kenya[1]
ComparisonSelected water harvesting and integrated soil fertility management technologies; experiment controls[1]
Effect sizeFarmers practice rated good (mean score 2.78), yielding 3.5 t/ha[1]
Times cited8[1]

The control plots provide a low-yield comparison

  • 0.3–0.6 t/haExperiment controls received poor overall ratings and yielded 0.3–0.6 t/ha.[1]

What the ratings and comparisons establish

The study compared farmer perceptions with biophysical data for selected water-harvesting and soil-fertility technologies in sorghum and cowpea. That pairing helps show whether farmer assessments align with measured production, but does not by itself establish how results would transfer to other settings.[1]

The proposed food-security contribution is conditional: the source frames it around traditional crops, modest organic and inorganic inputs, normal farmer practice, and adequate rainfall. It does not quantify a broader food-security effect.[1]

What the evidence leaves unresolved

  • How would the evaluated practices perform where rainfall is insufficient or highly variable?[1] [2]

Sources

  1. Integrating scientific and farmers perception towards evaluation of rain-fed agricultural technologies for sorghum and cowpea productivity in Central Kenya (Academic Journals, 2013)
  2. Tillage Effects on Selected Soil Physical Properties in a Maize-Bean Intercropping System in Mwala District, Kenya (2014)

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

This article is based on research published under:

DOI-LINK: 10.5897/jssem2013.0378, Alternate LINK

Title: Integrating Scientific And Farmers Perception Towards Evaluation Of Rain-Fed Agricultural Technologies For Sorghum And Cowpea Productivity In Central Kenya

Subject: General Materials Science

Journal: Journal of Soil Science and Environmental Management

Publisher: Academic Journals

Authors: N. M.

Published: 2013-11-29

Everything You Need To Know

1

What farming methods have proven effective for boosting sorghum yields in Central Kenya, according to the study?

The study in Central Kenya demonstrated that integrating farmers' standard practices with external soil amendments significantly boosts sorghum yields. Specifically, the addition of 40 kg of phosphorus per hectare and 20 kg of nitrogen per hectare to their existing methods resulted in a mean score of 2.78 and a yield of 3.5 tons per hectare for sorghum. Tied ridges and contour furrows, when combined with similar soil amendments and manure, were also highly effective.

2

What does integrated soil fertility management entail, and how was it applied in the Central Kenya study?

Integrated soil fertility management involves combining traditional farming practices with external soil amendments to enhance crop yields. In the Central Kenya study, this included using farmers' standard practices and adding 40 kg of phosphorus per hectare and 20 kg of nitrogen per hectare. Water harvesting techniques like tied ridges and contour furrows were also integrated with soil amendments and manure.

3

Why are sorghum and cowpea considered important crops for enhancing food security in Central Kenya?

Sorghum and cowpea are well-suited to the climate of Central Kenya and offer a sustainable alternative to more resource-intensive crops. By focusing on improving the productivity of these traditional crops, the region can enhance its food security and support local livelihoods. The study aimed to identify effective methods for growing sorghum and cowpea, thus promoting their use as staples.

4

Why are water harvesting techniques like tied ridges and contour furrows important for farming in Central Kenya?

Water harvesting techniques like tied ridges and contour furrows are crucial because they help conserve water in the soil, which is essential in semi-arid regions with unreliable rainfall. Tied ridges prevent water runoff by creating barriers at intervals, while contour furrows follow the land's contour to maximize water absorption. These methods, when combined with soil amendments and manure, can significantly improve crop yields and resilience to drought.

5

How was the Partially Balanced Incomplete Block Design (PBIBD) used in the Central Kenya study, and why was it important for the research methodology?

The Partially Balanced Incomplete Block Design (PBIBD) was used to systematically evaluate different combinations of water harvesting and soil fertility management techniques across 36 plots, replicated three times. This design allowed researchers to test multiple methods simultaneously while accounting for variations in soil and environmental conditions. By using PBIBD, the study could determine which specific combinations of techniques farmers perceived as most effective and compare these perceptions with actual yield data, ensuring a robust analysis of the results. The use of PBIBD allowed for structured data collection, and minimized bias by comparing treatments in smaller blocks. This approach enhanced the statistical power and reliability of the study's findings, ultimately informing more effective and sustainable agricultural practices.

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