Companion planting: Three sisters & five sisters crops planting in Africa

 

Companion Planting: Three sisters and five sisters planting in Sub-Sahara Africa

Companion planting

Have you ever wondered why some crops produce more when planted together with certain plants? Just visualize a rural organic farmland with maize, beans and cocoyam (Ibo coco) planted together! The tons of harvest from this mixed farming will leave you puzzling. Yes, our ancestors farmed and harvested tons of food without any chemical input. And I wonder what happens now. The chemicals we keep applying in our farms have been polluting the soil, killing soil organisms, destroying our ecosystems and affecting our health. It is time we begin to understand the beneficial synergy between different plants so we can increase yield, control pests and diseases without applying external chemicals into our farmlands. Welcome to the world of companion planting.

Companion planting

Have you ever wondered why some crops produce more when planted together with certain plants? Just visualize rural organic farmland with maize, beans, and cocoyam (Ibo coco) planted together! The tons of harvest from this mixed farming will leave you puzzling. Yes, our ancestors farmed and harvested tons of food without any chemical input. And I wonder what happens now. The chemicals we keep applying in our farms have been polluting the soil, killing soil organisms, destroying our ecosystems and affecting our health. It is time we begin to understand the beneficial synergy between different plants so we can increase yield, control pests and diseases without applying external chemicals into our farmlands. Welcome to the world of companion planting.

So what really is companion planting?

Companion planting is the practice of growing different plants together so they can benefit from each other. Certain combinations of plants make each of them more productive. Why? Because some plants have a mutually beneficial relationship with complementary characteristics such as nutrient requirements, natural support, weed suppression, pest-repelling abilities amongst others.

A typical example of companion planting is the famous Three Sisters crop -where maize, beans and pumpkin or squash are planted together. This has been done in Sub-Sahara Africa for millennia. Today it is still the usual traditional practice within rural communities’ farmland in the tropics. These plants do complement each other and each of them does benefit from the union as they grow symbiotically to deter weeds and pests, enrich the soil fertility and support each other.

•         The tall corn provides support to the climbing beans, you can use any variety of corn – soft, pop, white, yellow, etc...
•        The fast-growing beans convert atmospheric nitrogen to soil nitrogen which fertilizes all the plants especially corn which requires a large quantity of nutrients. The beans also help to stabilize the maize during heavy wind.
•         The squash or pumpkin grows low and wide around the corn and beans. It shades the soil to prevent moisture loss. Its big leaves also suppress weeds and control pests and insects.  Bingo! 
•     What a wonderfully beneficial relationship. Please like comment and subscribe while we share information on how to plant the three sisters

How do we plant the three (3) sisters?

Note: In sub-Sahara Africa they are two planting seasons starting in March and September. So make sure you plant at the right time

• 1     Choose a sunny location with at least 6 hours of full sunlight every day
• 2     Clear the farm around January and allow the grass/shrub to dry and decompose for about 6-8 weeks before tillage.
• 3     Make sure you start tilling at the beginning of the planting season.
• 4     Fold the dried and decayed grass/shrubs in the middle of the furrow.
• 5    Prepare the soil with much organic matter, composted animal/farm manure and wood ash.
• 6     Hoe the soil on both sides of the furrow to cover up the decayed grass/shrub within the bed.
• 7     Make a bed about 0.5m wide, 20cm high and 4m long.  Inter-bed distance should be about 50cm.
• 8     Cut the pumpkin or squash open, remove the seeds and spread to dry under shade for 2 days. Get your maize seeds ready for planting.
• 9    Then plant your maize – 3 seeds per spot, 1m apart. Then plants 2 seeds of pumpkin between the maize.
• 10.  About 10 days later, you plant your beans, 2 seeds close to the corn.
• 11 Sit, relax and watch the 3 sisters do the magic. Nature has it all. 

 The three sisters provide both sustainable soil fertility as well as a healthy organic balanced diet. Experience has shown that the concept of 3 sisters crop can include even up to 4 or 5 crops. For the purpose of increasing food yield on a small piece of land, I will showcase how to plant up to 5 complimentary crops on raised beds in a planting season. For this, we shall be adding amaranth (Greens) and Cocoyam. This mixed planting increases biodiversity which attracts pollinators to enhance flowering, fruiting and food production.

Amaranth

·        The fourth sister (Amaranth – Greens) is included because it attracts pollinators, lures birds away from eating the maize and is also very nutritional. More pollinators imply more fruits and more yield.

Growing cocoyam

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Then the fifth sister which is cocoyam (ibo coco) is a staple food in sub-Sahara Africa and grows for about 5 months before harvesting tubers for food. So it will be the last crop to harvest before we prepare the soil again for the next planting season. It helps to control pests and suppresses weed.

 How to plant five (5) sister crops on raised beds in the tropics

• Make a bed about 1m wide, 30cm high (flat top and 4-6m long. Inter-bed distance should be at least 50cm.
• Cover your cocoyam on a dark wet area to sprout into seedlings
• Plant your cocoyam seedlings 20cm deep and 1m apart on both sides of the beds.
•  Plant your maize – 3 seeds between the planted cocoyam.
• Then plant 2 pumpkin seeds in a spot about 20cm close to the cocoyam
• Sparingly broadcast your amaranth seeds on the beds and level the bed by racking so some seeds are lightly covered.

• After 10 -14 days  you plant your beans 2 seeds just 10cm close to the maize 
• The seeds used for this type of sisters cropping should be organic seeds
• Direct the beans vines towards the nearest cornstalk as they grow. This allows it to climb upwards, rather than creep along the ground.
• Hoe as many beds as you can and weed regularly

1     Harvested in succession

1.     Amaranth can be harvested 7 weeks after planting. Use a sharp knife to cut the soft stem, leaving 2-3 nodes underneath for new shoots. You can harvest weekly for the next 2 months before it starts flowering.

2.     Pumpkin/squash soft stems and leaves can be harvested from the 8th week after planting. They spread out fast once the first meristematic tip is cut off. Harvesting too can continue for the next 3 months before fruiting. Don’t harvest too much if you are interested more in the pumpkin/squash fruits.

3.     The beans start flowering just 10 weeks after planting. Harvesting commences from the 14 weeks when the beans are matured for harvesting. This may continue for another 2 months.

4.     The maize is ready in about 16 weeks. After harvesting the maize, leave the stalk to dry up for another 2 weeks so you can continue harvesting the beans. After this, the production of the beans begins to reduce, then you cut the stalk to mulch the cocoyam and add some soil on the bed so the cocoyam can produce bigger tubers.

5.     At the end of 22 weeks, you start harvesting the cocoyam and pumpkin fruits. Get ready for another planting season starting in September.

Thinking time

Climate change has led to an increase in temperature which has resulted to drought that is negatively affecting crops production, especially in sub-Saharan Africa.

Question: What could you easily add as the 6^th sister crop to remedy this situation?  Explain your reasons… 2min to think and write your ideas below in the comment.

Watch the video on companion planting of our three or five sister groups here

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Advantages of organic cocoa and/or coffee agroforestry

Organic cocoa or coffee production

Organic cocoa and/or coffee production is based on a sustainable socio-economic and environmental agroforestry system, where trees are grown in combination with taller shades and food/fertilizer trees. Cocoa/coffee trees are integrated into existing forest structure to retain multi-storey canopy and minimize environmental impacts. In case of no trees on site, other trees should be planted to provide shade and create the multi-storey agroforestry effect. 

Diverse tree species with cocoa/coffee as under-storey

These diversify trees species provide the following benefits

1.     Help to control pests;
2.     Provide shades for the cocoa/coffee tree;
3.     Enhance soil fertility;
4.     Improve cocoa/coffee yields;
5.      Provide food, folders and medicine;
6.      Retain habitats for birds, small animals, insects and other pollinators;
7.     Create environmental and micro climate buffering;
8.     Provide multiple revenue streams to alleviate poverty;
9.     Better nutrition from diverse food sources;
10.     Enhance community resilient to food security.

Incorporating crop successions is very important as it improves soil fertility, growth of cocoa/coffee tree, mitigate effects of climate change and provides continues food and farm income. Plants like banana, plantains, papaya, pineapples, avocado, citrus fruits, mangoes, cocoyam and yams can be incorporated into cocoa farms. This mixed cropping system improves farmers’ livelihoods by generating multiple income streams from different crops and enhancing nutrition.

Zero use of pesticide, herbicide and insecticide as they upset the ecosystem by killing pest predators, poisoning animals and humans as well as polluting the water systems and causing further damages to aquatic life. Only biological and traditional methods which are non-toxic, less costly and environmentally friendly should be used. Such as removing and burying cocoa pods affected by black pods diseases amongst other.

Zero use of fertilizer to preserve the soil biota, halt eutrophication of water bodies, reduce cost and farmers dependent on agro-chemical companies.  Improvement of soil health through increase in organic matters, compost, vermicomposting and planting of fertilizers trees is practiced to avert chemical risk. Here there is a switch from external inputs (chemical fertilizers) to internal inputs - compost & manure produced on the farm within its diversified agroforestry system.

Fruit trees and plantains incorporated into cocoa/coffee agroforestry

Increase in organic material through pruning and mulching from a stratified, diverse and densely planted agroforestry is sufficient for an economically viable production. All cocoa shells should be evenly spread out to rot and recycle soil nutrients. Palms can be incorporated into plantations to provide phosphorus; which is an essential nutrient to increase yield and plant health; and reduce heavy metal in cocoa/coffee beans content. Through symbiosis with mycorrhiza, palms are capable of breaking down phosphorous and also bind heavy metals in soils. Leguminous trees such as Albiza Zygia should also be planted to fix atmospheric nitrogen and make it available to plants around them, and also improves pH in acidic soil. It has a high potential for ameliorating degraded cocoa/coffee soils and reducing soil erosion. Nitrogen is essential in plant health and cocoa/coffee productivity.

Good practices and care such as tree pruning and Phyto-hygiene should be carried out to control pests and diseases. The use of chemical is avoided as organic production rely on alternative solution to soil fertility, pest management and quality assurance that are not detrimental to humans and the environment.

Advantages of organic cocoa and/or coffee production

·         Reduce production cost – The cost of production is greatly reduced as the use of expensive external inputs such as pesticides, insecticides, herbicides and fertilizers are eliminated. Local seeds are used instead of expensive hybrid seeds. Compost and manure are used rather than expensive fertilizers. Thereby, making farmer’s less dependent on expensive inputs from agro-chemical companies and input cost.

·         Increase income – Organic cocoa beans are more expensive than conventional cocoa at the international market. The increase price of organic coca beans and low input cost results to higher farm income.

Dr. Nvenakeng Suzanne at Suzy-farms, Buea, Cameroon

        Environmental and health benefit – There is reduction of environmental and health risks as pollution is avoided and there is increase in biodiversity within a multi-storey agroforestry system. The health of farmers is also protected by avoiding hazardous chemicals such as pesticide, herbicides and insecticides.

       Increase in farmer’s sovereignty - Intercropping other food crops and fruit trees in cocoa and/or coffee agroforestry provides farmers with additional food and income. Farmers becomes independents with multiple sources of food to improve nutrition and income streams to alleviate poverty.

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Importance of Soil Organic Matter

 

The role of soil organic matter in agriculture

It is important for farmers to maintain healthy soil because it produces healthy crops that nourish people. Plants obtain nutrients from organic matter and minerals. Organic matters are plants and animal materials that return to the soil and decompose to produce nutrients, bind soil particles into aggregates, improve water holding capacity of the soil and harbor other soil organisms. These soil organisms convert dead materials, decaying matter and minerals into plant nutrients. Their biological activities depend on the organic matter supply and the type of substrate. The exchange of these nutrients between organic matter, water and soil is vital to soil fertility. Organic matter and soil nutrients need to be maintained for the continuous production of food. The soil fertility will decline if the land is cultivated without restoring the organic matter, nutrients and soil structure. This may further destroy the agro-ecosystem and reduce food yield. Organic matter thus plays a vital role in improving soil productivity and sustainable crop production, especially in the tropics. 

Mulching preserves moisture & organic matter

What is soil organic matter?

Soil Organic Matter (SOM) is a wide range of carbon-containing compounds formed from organic material – the products of on-site biological decomposition which keeps the soil healthy. SOM helps to feed plants, increases growth and yield; improves the soil structure, fertility and acts as a mulch to suppress weeds, protects the soil and reduces water lost. Soil organic matter is key to drought-resistant soil, sustaining food and increasing production. It can also be called soil improver, soil conditioner, or humus.

The soil organic matter is governed by the carbon cycle. The plant grows and adds organic matter to the soil through its roots, fallen leaves and dead plants. Most animals feed on plants and animal matter is also returned to the soil.  When they decompose, the organic matter releases carbon dioxide that is used by the plant in photosynthesis and valuable plant nutrients such as Nitrogen, Phosphorus and minerals.

The continuous supply of organic matter also acts as a food source for micro-organisms and helps build up soil carbon in a process called assimilation – which is vital for soil formation, nutrient availability and cycling. Different types of organic matter produce different organic matter fractions because they have different assimilation and decomposition characteristics. So if the rate of decomposition is more than assimilation, the SOM will reduce quickly (e.g. poultry manure); but if the rate of assimilation is more than decomposition, the SOM will increase (e.g. woodchips). The rate at which decomposition occur depends on oxygen, temperature, moisture, the surface area of the particle and its chemical structure. It takes more than 1 or 2 years for most organic matter to decompose and an ideal active soil organic matter contains about one-third of decomposable organic matter.

Avocado planted without tillage 

Why use organic matter?

In a natural forest, organic matter accumulates in soils.  Natural soils contain about 40% more organic matter than cultivated soils. When we cultivate the soil, the SOM declines because planted crops supply less organic residues than natural vegetation and the effects of tillage (digging, hoeing …) further increase the rate of SOM loss. It continues to decline to a level where the soil function is impaired and becomes unproductive. 

SOM influences several critical soil functions. It helps the soil to hold water and nutrient, improves soil structure, enhances productivity and environmental quality, reduces the severity of droughts, soil erosion and atmospheric carbon dioxide that contribute to climate change. SOM binds soil particles into aggregates that hold moisture and nutrients (preventing them from being washed away by rain). When plant roots penetrate these aggregates, the nutrients are released to feed the plants.

What human intervention decreases organic matter?

Repetitive harvesting of crops reduces soil nutrients and SOM. So much effort is needed to replenish these nutrients and restore soil quality. Most agricultural practices like ploughing, tillage and burning of vegetation increase the decomposition of soil organic matter and the soil become infertile and susceptible to erosion. Land use and management practices affect SOM. Below are some human activities that greatly decrease organic matter;

•  Decrease in biomass production such as replacement of perennial crops, replacement of mixed vegetation to monoculture or pastures, high level of harvesting (e.g. corn with stalks) and the use of bare fallow.
• Reduction of organic matter supply like burning of natural vegetation or crop residues (wildfires), overgrazing, and removal of crop residues.
•  Increasing decomposition rate through tillage, draining, fertilizers and pesticide usage.

How do we increase SOM in farms and gardens?

The key to soil restoration is to maximize the retention and recycling of plants' nutrients and organic matter while minimizing the loss of soil components through leaching, erosion and runoff. This will help to maintain, improve and rebuild soil health and sustain agricultural productivity. Farmers or gardeners need to continuously add sufficient organic matter (3-6%) to increase soil nutrients holding capacity, moisture and plant growth. Severe impacts may occur if the organic matter levels fall below 2%. Fortunately, you don’t need to test the soil to know if it needs organic matter or not. Soils that are light in color and compact when wet or dry probably require organic matter.

Some good conservation agricultural practices like zero or minimal tillage, cover cropping, agroforestry, perennial forage crops and crop rotations can help to maintain surface residues, roots and SOM. They can also suppress weeds, enhance soil aggregates and intact large spores which in turn allow water filtration and reduce water erosion and run-offs. The diverse soil organisms in SOM contribute to pests control and other essential ecological processes. Permaculture or well-managed integrated mixed crop-livestock farming systems are able to enhance SOM and restore soil health.

Mango planted with a little digging

Sources of organic matter

There are different sources of organic matter according to the different land use. The most important source of organic matter is biomass production.

•  Agricultural farms can get organic matter from crop residues, animal manure, green manure. The application of livestock manure to agricultural land increases soil organic matter in the soil profile.
•  Home gardens can get organic matter from household waste, commercial waste, old wood, green waste and compost - kitchen compost (from vegetables, fruit and gardening waste) and green compost (from pruning, branches, grass and leaf litter).

Garden compost is less costly and effective. Some compost can be bought as soil improvers or conditioners. Composted animal manure, spent hops from local breweries and spent mushroom compost can also be collected and used. Some councils offer municipal compost to gardeners (beware of weed killer residues). Organic matter can be stored - stacked and cover with rainproof material to prevent nutrients from being washed off by rain.

How to apply organic matter to soil

Into the soil: -Always add only well-composted materials into the soil to avoid soil nitrogen depletion. 5kg of compost per square meter is sufficient.

On the soil as mulch: - Most organic material can be used directly as mulch e.g. shredded wood waste, wood chip, bark, leaves. Coarser materials will take a longer time to break down. 2-5 cm mulch is enough for weed control or no-tillage gardens.

Leaves return to the soil as organic matter

Always wear boots and gloves when handling the organic matter; avoid eating, drinking, smoking and wash hands after application. Apply nutrients a week before planting and don’t over-fertilize to avoid contamination of water bodies.

Organic matter saves on fertilizer costs because manure contains about 0.8% nitrogen, 0.3% phosphate and 0.8% potash. Unlike fertilizers, the nutrients in organic matter are released slowly with little wastage and the organic matter themselves improves soil structure. Organic matter can be applied every 2 years because the nutrients are mainly available in the first 2 years after application and decrease thereafter. Make sure your compost is free of pests, diseases and weed seeds.

 Conclusion

Maintaining levels of SOM and optimizing nutrient cycling is vital in agricultural productivity. Some SOM fractions function as natural plant hormones that improve seed germination, root initiation, uptake of plant nutrients and provide N, P and S. Farmers should aim to achieve optimal agro-ecosystems that are socially, ecologically and economically sustainable by practicing conservation agriculture - a system that is able to convert low-input agricultural systems into a more productive one. Farmers need to understand the linkages between soil life, functions of the ecosystem and the impact of human activities to know how to enhance soil health and capture the full benefits of soil biological activities that lead to a more sustainable and productive agricultural system. A healthy soil ecosystem does the following:

• Decompose organic matter to form humus
• Retain Nitrogen, Phosphorus, Sulphur, Potassium and Calcium.
• Glue soil particles together into aggregates for the best structure
• Protect roots from pests and diseases
• Make retained nutrients available to the plant.
• Produce hormones that help plants grow
• Retain water moisture

SOM at different decomposition levels

Farmers! Let’s benefit from this knowledge and increase productivity. Take appropriate action now and let’s together feed the growing population while maintaining agro-ecosystems. Leave a comment or question below so we know you were here.

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Polyculture for pest control, high yield & food diversity

 Polyculture - alley, strip, cover, inter, mixed or three sister cropping systems

Polyculture is an agricultural system were multiple crops are planted on the same piece of land to provide crop diversity which mimic the diversity of natural ecosystems. This does not only provide food, but sustain life as a whole. As opposed to raising single crop/animal (monoculture), polyculture is raising more than one species of plants or animals at the same time and place. Polyculture is an old system of farming which is still carried out in sub-Sahara Africa and has regained popularity today because of its environment and health benefits. It is a sustainable form of agriculture because of its ability to control pests, weed and diseases without major chemical inputs. There are different types of polyculture systems such as intercropping, cover-cropping and alley cropping. The type of polyculture carried out depends on the types of plants grown, the spatial distribution and the time they spend growing together. The type of plants or animals that can be raised in a polyculture system has no limit.

Three sister crops (Maize, beans and pumpkin)

Intercropping or mixed cropping – This occurs when two or more crops are planted together e.g legumes and cereals mixtures. The legumes fix atmospheric nitrogen into the soils at its root noddle in a process called nitrogen fixation. This soil nitrogen acts as fertilizer for the other plants and therefore eliminates the need for man-made fertilizers. A typical example is the ‘three sister crop’ system of planting maize, beans and squash (e.g pumpkin) in a group to provide mutual benefits to each other. The maize provides support for the beans to grow on, the beans provide nitrogen to fertilize all the plants while the squash suppresses the weeds. These crops thus sustain each other with little or no human intervention.

Cover cropping: - This is when a crop is grown alongside another plants that is not a crop e. grass & legumes. Cover crops can help to prevent erosion, suppress weeds, improve water retention or fix nitrogen. It can also be called weedy culture if the non-crop element is a weed.

Strip or alley cropping

Strip or alley cropping: - This involves growing different crops in alternating rows. Though it doesn’t involve a complete mix of the plants, it also prevent soil erosion and aid nutrient cycling. 

Permaculture: - This is a polyculture of perennial plants such as cocoa, coffee, timber, fruit trees etc. This system increases soil fertility, decreases soil erosion, conserve soil nutrient and increase soil organism and water retention. Agroforestry is a popular form of permaculture where trees and crops are grown together. The trees provide shade and organic nutrients when they share off their leaves and also provide extra commodities like timber, medicine, firewood etc. Shade loving crops like coffee and cocoa are well suited within such a system.

Advantages of polyculture

Pest and disease control: - Pest are less predominant in polyculture due to crop diversity. Specialized pest that prefers a concentration of a single crop type often gets confused as they find it difficult to locate a favorable host in a polyculture. Common general pest moves from one plant to another within a polyculture system to the surrounding environment because they look alike, thereby reducing the effect on a particular crop. This diversity of plants attracts natural enemies or predators which help to further suppress pest population without causing harm to the plants. Different plants are susceptible to different diseases so the spread of diseases can be contained in polyculture.

Weed control: - the high density of plants reduces available space, sunlight, water and nutrients for weed to develop as resources are fully utilized by crops. The few that do grow can host arthropods (pest enemies) that are beneficial to other crops.

 Sustainability: -

A bunch of plantains at Suzy-Farms

A polyculture system doesn’t depend on pesticide, but can be boosted with minimal use of organic fertilizers as diverse plants are planted together. This greatly reduce eutrophication of fresh water, hence good health and wellbeing. Reduce tillage conserves microbes and soil nutrients. This saves money as farmers can grow multiple crops and animals on same piece of land with little or no machinery. It increases local biodiversity which attract different pollinators, hence increase pollination and fruits harvest. Polyculture addresses human subsistence needs because food security doesn't just depends on quantity, but on diversity and quality of available food. Polyculture is diverse in nature and provides both nutritional and economic resilience  because if one plant fails, the other crops may support the household with food and income.

Polyculture is more effective when the diverse plant species have distinct biological needs such as absorbing different nutrients and requiring different amount of sunlight (no competition). Our modern lifestyle is negatively impacting our land and ecosystems. Restoring these systems will lead to food abundance to support human life and culture as well as restore the ecosystems. It is our duty to secure a rich permaculture for future generation. So let’s do it...

NB: Leave a comment below so I know you were here...

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