Nitrogen Fixing Trees
Soil fertility is the overriding constraint to food production in the tropics, and yet in many developing countries fertilizers are unavailable or beyond the reach of subsistence farmers. The biological fixation of atmospheric nitrogen is the only way that plants can manufacture their own fertilizer and is the main input of nitrogen in many tropical cropping systems.
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Calliandra is a vigorous, nitrogen-fixing, bushy tree that can be fast-growing on poor soils. The tree responds well to coppicing, is a good fuelwood source and the leaves provide excellent fodder. Calliandra is used to enrich soil and provide stability on steep slopes.
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Gliricidia is a fast-growingnitrogen-fixing tree that grows up to 15m in height. It is used for living fences, green manure, fodder, honey production, wind breaks, and fuelwood. This tree tolerates dry, acid, alkaline, and salty soils and was traditionally grown to shade cocoa trees.
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The genus Leucaena includes several multipurpose tree species and interspecific hybrids that can withstand almost any type or frequency of pruning or coppicing. They are native to Mexico and Central America, and now abundant in the Philippines, West Africa, Nepal, Australia and Hawaii. Spanish...
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Common nitrogen fixing trees for fodder production summarized by mean annual rainfall and mean annual temperature.
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Nitrogen fixing trees (NFTs) are special in their potential for agroforestry planting. Through nitrogen fixation, this critical soil nutrient is extracted from the atmosphere and converted to a form usable by plants. The trees don’t perform this process but instead this is done by symbiotic soil...
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NFTA 89-02, May 1989 A quick guide to useful nitrogen fixing trees from around the world Of Australia’s tropical area, almost 2 million km2receives less than 500 mm of rainfall annually. Soils are diverse, but typically low in plant nutrients, with widespread and severe deficiencies in phosphorus...
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FACT sheets on multipurpose trees.Aimed at extension agents, field researchers, community leaders, and farmers, these two-page summaries of current information are a handy reference for introducing promising multipurpose trees into research and planting programs. All FACT sheets are available in...