Impact of Farm Management on Soil Fertility in Agroforestry Systems in Bali, Indonesia

Jessica Chavez, Vincent Nijman (), Desak Ketut Tristiana Sukmadewi, Made Dwi Sadnyana, Sophie Manson and Marco Campera
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Jessica Chavez: School of Biological and Medical Sciences, Oxford Brookes University, Oxford OX3 0BP, UK
Vincent Nijman: School of Law and Social Sciences, Oxford Brookes University, Oxford OX3 0BP, UK
Desak Ketut Tristiana Sukmadewi: Agrotechnology Study Program, Faculty of Agriculture, Universitas Warmadewa, Denpasar 80239, Bali, Indonesia
Made Dwi Sadnyana: Bumi Lestari Conservana, Denpasar 80237, Bali, Indonesia
Sophie Manson: School of Law and Social Sciences, Oxford Brookes University, Oxford OX3 0BP, UK
Marco Campera: School of Biological and Medical Sciences, Oxford Brookes University, Oxford OX3 0BP, UK

Sustainability, 2024, vol. 16, issue 18, 1-15

Abstract: Expansion and intensification of agricultural land in the tropics increasingly raises environmental concerns and questions about sustainability of production systems. A key parameter to consider when assessing the sustainability of production systems is soil fertility, and of particular interest are macronutrients, pH, electrical conductivity, and microbial communities. To understand which environmental factors influence soil fertility, we studied the abovementioned key parameters in two agroforestry systems (rustic and polyculture) in Bali, Indonesia. Via Generalized Linear Models, we found that agroforestry system, canopy cover, crop richness, tree richness, and yields had differing effects on topsoil (0–5 cm) and subsoil (10–15 cm) properties, including C:N ratios, conductivity, K, organic C, P, and total microbes. We found a higher C:N ratio in topsoil ( p = 0.027), higher organic carbon content in topsoil ( p = 0.009) and subsoil ( p < 0.001), higher total microbes in subsoil ( p = 0.001), and lower phosphorus levels in topsoil ( p < 0.001) in rustic than in polyculture systems. Rustic systems may foster conditions conducive to soil fertility, and in our study, canopy cover ( p < 0.001) and tree richness ( p < 0.001) emerge as a key positive drivers of the total number of microbes in topsoil. The positive associations observed between crop and tree richness with electrical conductivity and total microbe counts underscore the importance of biodiversity in enhancing soil fertility, emphasizing the need for diversified agricultural systems to promote soil fertility. With soil fertility declining across the world due to global investments in agricultural intensification, it is vital that food production systems divert to the use of systems such as agroforestry in order to ensure soil sustainability and food security for future generations.

Keywords: ecosystem services; agricultural intensification; sustainability; rustic systems; polyculture systems; Indonesia; agroforestry (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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