Conservation agriculture: Minimal Tillage and Surface Mulching of Soils

Conservation Agriculture for Sustainable Farming

Conservation agriculture (CA) encompasses three fundamental principles: minimal soil disturbance through reduced tillage, maintaining biomass residues on the soil surface, and crop rotation with nitrogen-fixing legumes or cover crops. This approach has demonstrated its efficacy in dryland wheat farming systems, offering multiple advantages. CA enhances soil quality, improves water use efficiency, stabilizes yields, reduces input costs, and minimizes energy and time demands. Furthermore, it enriches soil biodiversity, mitigates emissions, and sequesters carbon, benefiting both farmers and the environment.

This technology is TAAT1 validated.

8•7

Scaling readiness: idea maturity 8/9; level of use 7/9

Adults 18 and over: Positive high

The poor: Positive high

Under 18: Positive low

Women: Positive high

Climate adaptability: Highly adaptable

Farmer climate change readiness: Significant improvement

Biodiversity: Positive impact on biodiversity

Carbon footprint: Much less carbon released

Environmental health: Greatly improves environmental health

Soil quality: Improves soil health and fertility

Water use: Much less water used

Problem

Declining Soil Fertility: Declining soil fertility in dry tropical and subtropical regions of Sub-Saharan Africa, primarily caused by excessive tillage and limited organic matter return to soils, leading to the degradation of nutrient exchange and water retention processes.
Water Stress: Increasing water stress due to the limited availability of water resources caused by drought spells, high-intensity rains, and overexploitation for agriculture.
Low Wheat Grain Yields: Low wheat grain yields and vulnerability to water shortages in dryland farming systems.
Environmental Impact: Environmental concerns, including emissions and carbon sequestration, in agriculture.
Weed Infestation: Weed infestation resulting from traditional tillage practices and lack of surface mulching, competing with wheat crops for resources and reducing overall yields.
Soil Erosion: Soil erosion due to intense tillage practices, leading to the loss of topsoil and degradation of soil structure, which further exacerbates soil fertility issues.
Soil Compaction: Soil compaction caused by heavy machinery and excessive tillage, hindering root penetration and water infiltration, thereby reducing crop productivity.
Pest and Disease Build-Up: Build-up of pests and diseases in conventional tillage systems, leading to increased reliance on chemical pesticides and fungicides, which pose environmental and health risks.
Labor Intensity: Labor-intensive weed management practices in conventional tillage systems, requiring significant time and resources, particularly in regions with limited access to labor.
Soil Salinization: Soil salinization resulting from improper irrigation practices and poor water management, leading to reduced crop yields and degradation of soil quality over time.

Solution

Conservation Agriculture (CA) Principles: CA involves minimal soil disturbance, retention of biomass residues on the soil surface, and rotation with N-fixing legumes or cover crops.
Improved Soil Quality: CA enhances soil quality, water use efficiency, and yield stability while diminishing expenditures on inputs, energy, and time.
Climate Change Adaptation: CA practices reduce drought and heat stress on crops, offering effective climate change adaptation in the food system.
Water and Herbicide Savings: CA slows down soil drying and weed growth, helping farmers save on irrigation water and herbicide applications.
Crop Rotation Benefits: Rotating between wheat and other crops like soybean, rice, cotton, or others offers advantages for managing soil nutrient supply and pest and disease build-up.
Broad Applicability: CA principles can be applied in various soil types and water regimes in Sub-Saharan Africa, benefiting both rainfed and irrigated production, as well as dry sub-humid and semi-arid regions.
Increased Crop Resilience: CA practices contribute to the resilience of crops against environmental stresses such as drought and extreme temperatures, ensuring more consistent yields even under challenging conditions.
Erosion Prevention: By minimizing soil disturbance and maintaining surface residues, CA helps prevent soil erosion, preserving soil structure and fertility.
Enhanced Biodiversity: The adoption of CA promotes soil biodiversity by creating a favorable habitat for beneficial organisms, improving overall ecosystem health.
Reduced Environmental Impact: CA practices contribute to reducing the environmental footprint of agriculture by minimizing soil erosion, pesticide runoff, and greenhouse gas emissions.
Improved Farm Economics: By reducing input costs, conserving soil moisture, and stabilizing yields, CA improves the economic viability of farming operations, leading to higher profitability for farmers.

Key points to design your project

The technology of Minimal Tillage and Surface Mulching of Soils enhances crop productivity, ensuring food security through consistent yields. It conserves water, maintains soil health, and reduces the environmental impact of agriculture, thus aiding in poverty alleviation and promoting sustainable livelihoods for farmers.

To integrate this technology into your project, consider the following steps and prerequisites:

Raise awareness about the benefits of this management strategy for grain yield, water use, and soil quality.
Ensure accessibility to equipment for direct seeding and affordable fertilizer inputs through local dealers.
Implement incentives for agroecosystem services like erosion reduction, water conservation, and soil carbon storage.
Establish strong connections with food manufacturing industries to guarantee stable and profitable market access.

Allocate resources for comprehensive training and ongoing support during project implementation. Collaborate with agricultural development institutions to facilitate widespread adoption of the technology. Explore opportunities to combine this technology with complementary approaches, such as Heat and Drought Tolerant Wheat Varieties and pest-resistant wheat varieties.

Cost: $$$ 740 USD/ha

Three-year average total production under CA

15 - 22 %

Increase in yield

18 - 21 %

water use efficiency

20 %

increase in income

923 USD/ha

Increase in profit from wheat production

IP

Open source / open access

Countries with a green colour: Tested & adopted
Countries with a bright green colour: Adopted
Countries with a yellow colour: Tested

Countries where the technology has been tested and adopted
Country	Tested	Adopted
Burkina Faso	Tested	Adopted
Ethiopia	Tested	Adopted
Kenya	Tested	Adopted
Niger	Tested	Adopted
Nigeria	Tested	Adopted
South Sudan	Tested	Adopted
Sudan	Tested	Adopted
Zambia	Tested	Adopted
Zimbabwe	Tested	Adopted

This technology can be used in the colored agro-ecological zones. Any zones shown in white are not suitable for this technology.

Agro-ecological zones where this technology can be used
AEZ	Subtropic - warm	Subtropic - cool	Tropic - warm	Tropic - cool
Arid
Semiarid
Subhumid	–	–	–	–
Humid	–	–	–	–

Source: HarvestChoice/IFPRI 2009

The United Nations Sustainable Development Goals that are applicable to this technology.

Goal 2: zero hunger

Goal 13: climate action

Goal 1: no poverty

Goal 12: responsible production and consumption

Select Quality Wheat Seed: Choose improved varieties of bread and durum wheat that offer high yield potential, heat tolerance, and resistance to pests. Quality seed is essential for satisfactory production.
Prepare Seeding Tools: Utilize tools designed for direct seeding with minimal soil disturbance. Options include disc seeders drawn by tractors or animals and dibble sticks or jab planters for manual operation.
Set Row Spacing and Seed Rate: Maintain the same row spacing and seed rate density as in conventional farming systems to ensure optimal plant distribution.
Apply Fertilizers: Follow recommended rates for inorganic fertilizers and animal manure. Apply them either in planting holes or through topdressing to promote high grain yields and water use efficiency.
Cover Soil Surface: Obtain materials for covering the soil surface. These materials can be sourced from stover residues of the previous crop on the field or from external sources.
Weed Control: Treat the soil under CA management with herbicides to control weed encroachment and maintain a weed-free environment.
Mulch Maintenance: Spraying insect-repelling agents on the mulch layer may be necessary to keep it in place for an extended duration, ensuring effective surface mulching.