1. AFA-Agriculture and Food Authority (2014) Capsicum production in Kenya. Accessed on April 30, 2020, from https://agricultureauthority.go.ke
2. Barber RG, Thomas DB, Moore TR (1981) Studies on soil erosion, runoff, and proposed design procedures for terraces in the cultivated, semi-arid areas of Machakos District, Kenya. Soil conservation problems and prospects: proceedings of Conservation 80, the International Conference on Soil Conservation, held at the National College of Agricultural Engineering, Silsoe, Beford, UK
3. Basu SK, De AK (2003) Capsicum: historical and botanical perspectives. In: De AK (ed) Capsicum: The genus Capsicum. Taylor and Francis, London, UK, pp 1–15. https://doi.org/10.1201/9780203381151
4. Birgen J, Wafula G, Yusuf A, Onyatta J (2017) Assessment of sulphur dioxide levels in selected sites in Athi River, Kenya. Int J Trend Sci Res Dev 1:416–422. https://doi.org/10.31142/ijtsrd2320
5. Bremner JM (1996) Nitrogen total. In: Sparks DL, Page AL, Helmke PA, Loeppert RH, Soltanpour PN, Tabatabai MA, Johnston CT, Sumner ME (Eds.) Methods of soil analysis, part 3: chemical methods. Soil Science Society