Agroforestry

Sustainable By Nature
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Agroforestry

Island Nations are most affected by Climate Change. A measurable rise in sea levels is forcing inhabitants to move to other islands. Devastating hurricanes occur more frequently driving storm surges far inland destroying what little arable land there is with seawater. Rising temperatures are damaging both sea and land ecosystems. Island governments are eager to adopt “shovel ready” solutions to mitigate these issues. Agroforestry may be the ideal climate mitigation technology for islands that have become the “heat sinks” of the world’s oceans. The loss of the natural forest cover from exploitive logging decades ago has exposed more of the land to the sun, which has significantly altered understory ecosystems that once protected precious water resources. Our agroforestry plant nurseries not only grow tree seedlings for transplant to combat climate change but also grow food to alleviate food security to help feed an island.

Agroforestry Practices

Agroforestry is a land use management system that combines the cultivation of trees, crops, and/or livestock in a synergistic manner. It aims to create a sustainable and productive system while providing ecological, social, and economic benefits. There are several types of agroforestry practices that include silvopasture, alley cropping, forest farming, riparian buffering, shelterbelts and mutli-cropping parkland.

Feed An Island has created a new category of agroforestry that grows edible plants alongside trees for fruit or transplant.

Growing Food & Trees Together

PPlants grow in elevated sections joined together to form long linear assemblies. These 2 panel assemblies parallel one another creating 12-inch access corridors for planting, maintenance and harvesting. Each elevated section has two cavitations, one to grow trees and one to grow edible plants like vegetables, herbs, and berries. Compartmentalized root spaces permit the use of specific soil and fertilizer mixes for varying plant types. Trees require a different soil mix than vegetables, for example.

Plants are irrigated with either a commercial grade soaker hose or drip line depending on plant type. A renewable utility developed by our partner company, New Leaf Technologies, provides power for the nursery. A fence surrounds the entire facility to protect plants from animals and thievery.

Plant elevation makes for easy picking and a quick harvest and prevents the fruit of hanging plants from touching the ground, which promotes food safe practices. Edible plant types and varieties are governed by tree height. Bush beans could be grown years 1, 2 and 3 in full sun when trees are young and their undeveloped leaf canopies cast little shade. In years 4, 5 and 6, bush beans could be replaced with kale as tree leaf canopies create partial shade. Spinach and/or lettuce could be grown the final years in full shade.

Grow By Design

Raised panels may be assembled and arranged in a variety of ways to accommodate site topography. For example, a hillside can be terraced to create 15-foot-wide forest and food production pathways with a linear agroforestry assembly constructed down the center.

In another example, parallel rows of assembled panels can cover an acre of more with food and trees.

FFor an initiative in Ethiopia, we are developing open-air learning spaces characterized by three-sided enclosures made from sequentially arranged agroforestry panels. These living agroforestry courtyards will function as dynamic educational environments where instructors can educate students on cultivating food and trees using our technology. Although this may not align with our conventional Feed An Island projects, we view each of the 34 learning spaces as an instructional island, distinct in its separation and independence from the main school structure.

Agroforestry Production

A wide pocket cavity compartment is featured every 30-inches and can be utilized to grow a single tree, bush, multiple canes or large canopied vegetables, flowers, or herbs. In a tropical setting, trees for transplant are grown in every tenth cavity spacing trees about 25 feet apart. Large canopy plants are planted in the 8 wide pocket cavities between the trees.

Short top or hanging vegetables, herbs and flowers are planted in the 12-inch space provided between each of the 30-inch parallel panels, which is referred to as a narrow pocket cavity.

Trees will grow at least 15 years before the need to transplant, while edible plants are planted and replanted each season. Vegetables, flowers, and herbs are planted according to the sun and shade requirement for the plant, bush beans in the full sun and lettuce in the shade, for example.

A single 30-inch narrow cavity panel will produce 25 pounds of bush beans, 25 pounds of determinate plant tomatoes or more than 100 carrots.

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Agroforestry

Agroforestry can be defined as an intentional combination of forest and farm as a form of intercropping various tree and vegetable plant species to diversify income, increase biodiversity and conserve water, which meets 14 or the 17 United Nations Sustainable Development Goals (SDG’s) including No Poverty, Zero Hunger, Health & Well Being, Quality Education, Gender Equality, Clean Water & Sanitation, Decent Work & Economic Growth, Industry Innovation & Infrastructure, Sustainable Cities & Communities, Responsible Consumption & Production, Climate Action and Life On Land.

In the Caribbean, the urban heat island effect can exacerbate the already hot and humid climate, leading to increased energy consumption for air conditioning and negative impacts on human health, particularly for vulnerable populations such as the elderly and those with pre-existing health conditions. Moreover, higher temperatures can also have detrimental effects on local ecosystems, water resources, and air quality.

Both edible and non-edible plants grow naturally throughout a forest often creating symbiotic relationships that enhance plant health. This environment can be artificially created to grow endangered or preferred tree species with popular vegetable and herb plants in a specialized nursery.

Feed An Island agroforestry system grows tree seedlings to a height of 15-feet, which means these trees will create an instant forest wherever they are transplanted. Each year in the nursery, various vegetables can be grown selected by cultural preference, which provides employment, income, education, and food security. Trees can be fruit bearing, providing sustenance and income while they grow on site.

Forests on their own provide for at least a level of biodiversity, even in newly planted tree stands. Many species of birds will thrive in the tree canopy, and on the forest floor, a natural “green manure” is created each year from tree leaves that fall to the ground, which creates an environment for fungi and small creatures that feed on the decaying material. Over-time, non-woody plants germinate from this nutrient rich layer of material to create an under storied ecosystem beneath the tree canopy. Small animals will eventually inhabit the new ecosystem; larger animals like deer and elk soon follow soon after transplant. A diversified ecosystem will have been created in just a few short years, one that will feed and enrich the soil, purify, and conserve water and cool the air as a hedge against global warming and the effects of climate change.

The Feed An island agroforestry system have the added benefit of providing compost material as a soil additive (tree leaf, fruit and plant waste), which can be used to replace man-made fertilizers to augment and improve soil for growing edible plants year-to-year.

In the industrialized west, agroforestry is in its infancy, however in some tropical areas of the world landowners have been growing trees and agricultural crops together for generations. In Latin America for example, coffee plants needed to be cultivated under the shade of trees but in the 1960’s new plant breeds were introduced to the region that could grow in full sun. It soon became apparent that without shade, the new coffee plants required expensive, frequent fertilizing and became susceptible to all kinds of pests. Productivity and profit were also lower. Today, most of these new sun coffee plantations have been abandoned and the land returned to its natural state. Agroforestry would have been the answer for these Latin American growers.

In the UK, tree farmers are experimenting with intercropping more traditional agricultural crops with trees. Many types of vegetables can be incorporated throughout a tree grove, particularly when trees are young, and the plant canopy hasn’t entirely blocked out the sun. Most types of pole bean and pea plants will climb the trunk and branches of a young tree. Melons and squash of all types can be planted at the center point between each row of trees. Raspberries, blackberries, and currants will thrive between tree rows even as the canopy develops and creates more shade. Many herbs grow well in the acidic soil of a forest floor including parsley, cilantro, basil, mint, and rosemary.

In Asia, mushrooms are cultivated in stacked logs spread under the canopy of a living forest. Some of the most expensive and prized mushrooms are cultured using agroforestry practices.

Feed An Island offers a new system that grows trees and food together starting with a blank canvas, land that is clear of plant matter, ready to mold into a high-production agroforestry site.

Agriculturalists believe that agroforestry could combat climate change. An edible forest floor landscape would add to the carbon sequestration of a forest and forest floor plants would “feed on” decaying wood, leaf and plant other matter preventing released carbon from escaping into the atmosphere. An agroforestry landscape also drops the ambient temperature outside the forest by several degrees diminishing the “heat island” effect of global warming. With proper plant selection, an acre of food produced by an agroforestry half acre can match the production of an open field acre. A million agroforestry acres could produce 5 million pounds of food and feed hundreds of thousands of people worldwide.

A forest floor covered with edible plant cover saves a tremendous amount of water; as much as 50% of the water used to grow a rowed tree plantation or an open field farm, which makes agroforestry a must for water challenged areas of the world like the Caribbean islands.

Feed An island agroforestry can be utilized to grow specific plants, including threatened and endangered trees and other rare plant species. African Black Ebony for example, is on the verge of extinction. The nursery could grow thousands of these trees in the protected environment of the system. Endangered soft tissue plants can be grown along with the trees. Plants could be left to grow for years until they bear seed, which can be stored or planted for future generations.

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