Yam is a staple food and a vital source of energy for millions of people across the tropics. It is not only a delicious and versatile crop, but it is also highly nutritious. For the farmer who wants to cultivate yams without resorting to expensive and potentially harmful chemicals, and who seeks a method that is both simple and effective, there is one tried-and-tested approach that stands out: the yam mound cultivation system.
This article will explain why the yam mound is the easiest way to plant and harvest organic yams, provide a clear definition of this system, outline its many benefits, and guide you step-by-step on how to implement it on your farm.
What is Yam Mound Cultivation?
Yam mound cultivation is a traditional and highly effective farming method where soil is heaped up to form a raised bed, or mound, in which the yam is planted. The mound is the heart of this system. For many farmers, it's simply the easiest way to grow yams because it creates the perfect environment for the tuber to develop.
The concept is straightforward: instead of planting yams in a flat field, you gather the soil, organic matter, and sometimes manure into a mound. The planting material—a piece of a yam tuber, a small whole tuber, or a bulbil—is then placed at the top of this mound and covered with soil.
This method is not just a random practice; it is an intelligent design perfected over generations. It turns the soil into a loose, fertile, and well-drained home for your yam, leading to high yields and making the work of planting and harvesting much easier. Research has even shown that mound tillage can produce significantly higher yields than flat planting or ridging methods.
Why Choose the Yam Mound System? The Key Benefits
Adopting the yam mound cultivation system offers many rewards for the organic farmer. Here are the key benefits that make it the preferred method for growing nutritious yams:
- Ease of Harvest: This is perhaps the most significant advantage for the farmer. Because the soil in the mound is loose and raised, the yam tuber has plenty of room to grow without compacting. When it is time to harvest, you can easily cut the vines and, with a simple tug, remove the tuber from the mound with minimal effort. It spares you the back-breaking labour of digging deep into hard, compacted soil.
- Excellent Soil Aeration: The loose, raised soil of a mound is ideal for yam tuber development. Yams need soft soil to expand and grow into large, well-shaped tubers. The mound provides this environment, ensuring that roots can easily penetrate the soil to find water and nutrients. Mounding is known to create the best soil conditions for a high yam tuber yield.
- Improved Drainage: Yams do not like to sit in water. Too much water can cause their precious tubers to rot. Planting on a mound ensures that excess rainwater runs off, protecting the tuber from waterlogging and disease. This is a critical feature for organic farming, as we rely on natural processes rather than chemical fungicides to manage diseases.
- Concentrated Fertility: The mound allows you to concentrate organic matter—compost, well-rotted manure, dried leaves, and grass—in one place directly under and around the growing yam. This gives the yam direct and easy access to the nutrients it needs to grow large and healthy. As the organic materials break down, they become a rich, natural food source for the plant.
- It’s an Organic Approach: The yam mound system is inherently organic. It relies on natural soil preparation, organic matter for fertility, and often uses natural mulches. It supports the principles of organic farming by building healthy soil and avoiding synthetic chemicals. Studies have confirmed that organic management systems, which are perfectly complemented by mound cultivation, can yield equally or even more than conventional methods while significantly improving soil health.
A Step-by-Step Guide: Implementing the Yam Mound System
Now, let us get down to the work. Here is how you can easily set up your yam mounds, explained in simple and practical terms.
Step 1: Select Your Land and Prepare the Site
Choose a piece of land that gets plenty of sunlight and has deep, well-drained soil.
- Clear the Land: Begin by clearing the field of weeds, bushes, and any large stones.
- Tillage: This is very important. Use a hoe or a plough to till the land to a depth of about 20 to 40 centimetres (roughly the length of your arm from your elbow to your fingertips). This deep tilling is what makes the soil soft and easy to work with.
Step 2: Build the Mounds
The yam mound is your yam’s home. Build it right for a good harvest.
- Spacing: Use a rope or a stick to mark out where your mounds will go. A good spacing is about 1 metre by 1 metre or 75 cm x 75 cm. This gives each yam plant enough room to spread its vines and for the tubers to fatten up.
- Form the Mound: Using a hoe, pull the loose topsoil from the marked area into a heap. Shape it into a mound that is about 30 to 50 cm high. The base of the mound should be wide and stable, with a flatter top.
Step 3: Feed Your Mound with Organic Matter
This is where you turn your mound into a powerhouse of nutrition for your yam.
- Add Manure: As you form the mound, mix in some well-decomposed animal manure (like cow dung or poultry manure) at a rate of about 1 kg per mound. This is a fantastic source of natural plant food.
- Fill with Organic Materials: Another excellent and easy method is to dig a small hole in the top of the mound, place your yam set, and then fill the hole with dried leaves, straw, grass, or even kitchen scraps. As the yam grows, this organic matter decomposes, feeding the plant all season long.
Step 4: Plant the Yam Set
Now for the planting itself.
- Select Your Seed: Use a small whole yam tuber or cut a large tuber into pieces. Each piece you plant should weigh between 250 and 400 grammes (about the size of a large mango). Make sure each piece has some of the “crown” or skin, as this is where the new shoots will sprout from. Only use healthy, undamaged tubers.
- Planting: Place your yam set on the top of the mound. Plant it at a depth of about 5 to 10 centimetres (the length of your hand). Cover it completely with loose soil.
Step 5: Mulch the Mound
Mulching is like giving your yam a protective blanket.
- Apply Mulch: Cover the top of the mound with a layer of dry grass, straw, or leaves. This does several important things:
It keeps the soil moist by stopping the sun from drying it out.
It prevents weeds from growing and competing with your yam.
Step 6: Care for Your Plants
- Weeding: Keep the area around the mounds free of weeds for the first few months. You can do this by hand or with a light hoeing.
- Staking: Many yam varieties are climbers. If your yam sends out long vines, provide stakes (long sticks) for them to climb. This helps the plant get more sunlight and air, which keeps it healthy. In some areas, farmers let the vines trail on the ground, which can also help suppress weeds.
Step 7: Harvesting Your Yams
- When to Harvest: Your yams will be ready to harvest 6 to 12 months after planting, depending on the variety. You will know it is time when the leaves and vines begin to turn yellow and dry up.
- How to Harvest: Harvesting from a mound is easy, which is why this system is so popular.
- Cut the dry vines close to the top of the mound.
- Hold onto the piece of vine that is still attached to the top of the tuber.
- Gently pull or tug on the vine and the sides of the mound. The loose, soft soil of the mound will give way, and the tuber will easily come out. You might even be able to pull it out with your hands.
- After harvesting, you can even use the old vines and mound soil to help make the next year's mounds even better.
The yam mound cultivation system is a testament to the wisdom of traditional farming. It aligns with the principles of organic agriculture and provides a practical, low-cost, and effective way to grow a nutritious and valuable crop. By following these steps, you can look forward to a bountiful harvest of organic yams with less struggle and greater success. Happy farming
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