Land degradation in terms of soil erosion and nutrient depletion affects soil physical, chemical and biological properties; crop yield and income growth particularly crop income. Yet a basic assumption underlying the interventions in developing countries, mostly the degraded agricultural areas, is that adoption of soil and water conservation (SWC) practice has the potential to improve available soil nutrients specially carbon content, crop yield and crop income by reducing soil erosion. Less attention, however, has been given to specifying and linking the effect of adopted SWC practices influences (or specifically, improves) soil nutrients and crop yield; their impact on crop income and the factors influencing them in Ethiopia. Partly to fill this limitation, this review aims to look at the effects of adopted SWC practice in cultivated highlands of Ethiopia; the factors influencing them and their implications for soil and crop yield, carbon sequestration and crop income. Several findings indicated that SWC practices affected to soil bulk density (BD) negatively; and soil reaction (PH), potassium (K), available phosphorus (P), total nitrogen (N), soil organic carbon (SOC), soil organic matter (SOM), cation exchange capacity (CEC), texture, exchangeable sodium (N+), calcium (Ca+2), magnesium (Mg+2), other micro nutrients, crop yield and income positively. In addition, the review paper concerns that adoption of soil and water conservation practices has a positive impact for some agricultural soil and crop productivity, while negative impacts for some others, thus, a dynamic soil nutrient analysis should be more appropriate to improve agricultural productivity.
Table of Contents
1. Introduction
2. Conceptualizing soil and water conservation
3. Factors affecting soil and water conservation practices
3.1 Factors affecting soil and water conservation practices in Ethiopia
4. Factors affecting soil physical and chemical properties
4.1 Human factors
4.2 Environmental factors
5. Effect of soil and water conservation practices on soil fertility
6. Effects of soil and water conservation practices on carbon sequestration
7. Effect of soil and water conservation measures on crop yield and yield components
8. Impact of soil and water conservation practices on crop income
9. Conclusions and the way forwards
Research Objectives & Key Themes
This review article aims to examine the effects of adopted soil and water conservation (SWC) practices in the cultivated highlands of Ethiopia, identifying the key factors influencing their implementation and their broader implications for soil fertility, carbon sequestration, crop yields, and household income.
- Causes and impacts of land degradation and soil erosion in Ethiopia.
- Determinants of adopting and implementing effective SWC practices.
- Influence of SWC structures on soil physical and chemical properties (e.g., bulk density, pH, nutrients).
- Relationship between conservation measures, carbon sequestration, and crop productivity.
- Economic impact of soil management on smallholder farmer income.
Excerpt from the Book
Factors affecting soil and water conservation practices
Practical studies showed various factors for the causes of land degradation, among others, the disintegration between traditional and modern SWC strategies causes soil degradation. In this case, the crop production is more vulnerable to climate risks in turn, food security and the livelihood of millions had been affected (Altieri and Nicholls, 2013). The same study by ATPS (2013) indicated that climate risk related to drought and heavy rainfall affects farmers’ productivity, i.e. their crop production and yield. Both sheet and rill erosion remove fertile surface soil, resulting in soil fertility decline and crop yields. The study showed, the gap between farmers’ perceptions on the cause of soil degradation and the conservation measures undertaken by the government becomes the major problems of soil degradation in Ethiopia. Saguye (2017) showed, poor conservation structure in both farming and grazing plots caused land degradation. Continuous cropping, steep slopes, cultivation of marginal areas, overgrazing and destroying contour bunds on terraces to increase farm land are the causes for land degradation resulted soil erosion. Ashoori et al. (2016) showed disintegration of SWC with agronomic practices due to lack of funding, know-how, educational level and socio-economic activities and; Antle and Diagana (2003) due to lack of incentives are factors affecting conservation measures which are resulted soil degradation.
Additionally, disintegration of farmers’ perception of soil quality issues and soil scientists are among the factors affecting soil quality (Adeyolanu et al., 2018). Poor management of soil, climate change and topographic variations are factors affecting the productivity of African agriculture (Pauw and Ramasamy, 2019). So far, agriculture is the backbone of African economy especially in Ethiopia which covers high percentage of the national economy and the main sources of livelihoods as well as income for 85% of the population. However, environmental challenges particularly land degradation caused by poor agricultural conservation practices and poor implementation of structural and institutional factors affected to the agricultural productivity (FAO, 2016 and Yenesew et al., 2015). Saguye (2017) showed farmers’ perception to adopt conservation practices and extension services are the factors influenced SWC practices.
Summary of Chapters
Introduction: Provides an overview of land degradation, soil erosion, and nutrient depletion as major challenges to sustainable agriculture and farmer livelihoods in Ethiopia.
Conceptualizing soil and water conservation: Defines SWC as a management system crucial for improving soil fertility, structure, and for ensuring optimum conditions for plant growth.
Factors affecting soil and water conservation practices: Examines the gap between farmers' perceptions and government-led interventions, highlighting socio-economic and institutional barriers to effective conservation.
Factors affecting soil physical and chemical properties: Analyzes how human factors (like tillage and manuring) and environmental factors (like slope gradients and topography) affect soil health.
Effect of soil and water conservation practices on soil fertility: Reviews the positive impacts of physical SWC structures on soil bulk density, pH, and macronutrient availability.
Effects of soil and water conservation practices on carbon sequestration: Discusses the role of soil management in enhancing organic carbon stocks and mitigating the loss of carbon due to erosion.
Effect of soil and water conservation measures on crop yield and yield components: Details how integrated SWC practices improve growth parameters like plant height, biomass, and overall grain yield in wheat.
Impact of soil and water conservation practices on crop income: Evaluates the financial benefits for smallholder farmers, showing that conservation-linked agriculture typically results in higher crop production values and annual income.
Conclusions and the way forwards: Synthesizes findings, suggesting that future research should focus on dynamic experimental analysis to better quantify the impact of specific conservation measures.
Keywords
Soil erosion, Land degradation, Soil and Water Conservation (SWC), Soil fertility, Carbon sequestration, Crop yield, Ethiopian highlands, Smallholder farmers, Nutrient depletion, Agricultural productivity, Sustainable land management, Soil physical properties, Crop income, Conservation practices, Integrated SWC.
Frequently Asked Questions
What is the primary focus of this review article?
The paper systematically reviews how soil and water conservation (SWC) practices influence soil fertility, crop yields, and farmer income in the highland areas of Ethiopia.
Which key challenges does the research address?
It addresses land degradation, nutrient depletion, and the challenges of implementing effective conservation structures in the wake of population growth and climate change.
What is the central research question?
The main objective is to look at the effects of adopted SWC practices, the factors that influence their adoption, and their overall implications for agricultural productivity and household income.
What scientific methods are analyzed?
The document reviews various literature, journals, and conference papers regarding integrated SWC systems, evaluating both traditional vs. modern strategies and their impacts on soil/crop indicators.
What does the main body cover?
The body covers conceptual foundations, determinant factors for policy adoption, impacts on soil physical and chemical properties (e.g., bulk density, pH), carbon stocks, and quantitative evidence for crop growth and income yields.
Which keywords best describe this study?
Key terms include soil erosion, land degradation, SWC, carbon sequestration, Ethiopian highlands, and agricultural productivity.
Does SWC improve soil bulk density?
Yes, the studies reviewed indicate that conserved plots typically maintain better (lower) soil bulk density and improved texture compared to non-conserved, heavily degraded farm lands.
Is there proof that SWC practices increase farmer income?
Evidence suggests that farmers participating in SWC programs generally achieve a higher value of crop production and annual gross income compared to non-participants.
Why is a "dynamic soil nutrient analysis" recommended in the conclusion?
The author argues for dynamic analysis because simple comparisons between conserved and non-conserved plots are not yet refined enough to isolate the full impact of various specific conservation measures.
- Quote paper
- Tsegay Assefa (Author), 2024, Effect of Soil and Water Conservation Practices. Soil Fertility, Carbon Sequestration, Crop Yield and Crop Income in the Highlands of Ethiopia, Munich, GRIN Verlag, https://www.grin.com/document/1394722
