http://www.forages.css.orst.edu/Organizations/Agriculture/RIRC/Information2.html Information Sheet #2 - Tropical Legumes Dynamic information about regenerative agriculture ------------------------------------------------------------------------ LEGUMES FOR LASTING BENEFITS Soil health is critical for producing high quality crops whose yields can be sustained. Leguminous plants are an excellent tool for this purpose, improving soil health through regenerative means. Soil-improving legumes access atmospheric nitrogen (N2) through a symbiotic relationship with soil bacteria. These bacteria, Rhizobia and Frankia, form nodules on plant roots, enabling them to take N2 that has diffused through the soil and convert it to ammonia (NH3), which the plant can use. This process, called nitrogen fixation, is the legume's primary source of nitrogen when soil nitrogen is low. When plowed under, there is usually a net gain of soil nitrogen. Usually the bacteria that indigenous legumes require are present in the native soils. However, if a legume is being introduced to an ecosystem for the first time, the necessary bacteria may not be there. In this case the legume seeds can be inoculated by coating the seed with the bacteria before planting. In addition to N2, legumes provide a variety of benifits to regenorative farming, such as weed and erosion control. As a cover crop, legumes can outcompete weeds, reducing labor costs. Legumes control erosion in several ways: - They cover the soil and protect it from the impact of heavy rainfall during times of the year when it would normally be bare. - Their roots stabalize slopes. - They act as a barrior to water running down the surface of a slope. - They improve soil structure, allowing the water to infiltrate the soil more quickly, rather than running off the surface. Additional benefits include increased organic matter, reduced compaction, and providing a source of forage, medicine, fuel building materials. Below are descriptions of a few tropical legumes that illustrate these diverse applications. LEGUMES AT WORKMucuna sp. Mucuna sp., or "velvetbean," is a fast-growing climbing species native to Asia. An annual that thrives under warm, moist conditions, it is primarily utilized as an intercrop with maize, and as such, is an excellent green manure. Mucuna sp. has also been used as an animal feed. In Honduras, many farmers have replaced their bush-fallow system with an intercrop of velvetbean and maize. The velvetbean is left to grow in the fields after maize has been harvested, producing a vegetative mat up to 1.5m thick. This thick layer outcompetes weeds, protects the soil from water erosion, retains soil moisture and provides nutrients for the next maize crop. Velvetbean is more easily managed than weeds such as Imprerata (Alang-alang), reducing labor. When velvetbean technology is not used, summer planting of maize or beans is preceded by the slashing and burning of a fallow field. In the Sierra de Santa Marta, Mexico, weeding is done manually; weed and crop residues are used as mulch. Increased demands on the land have required shorter fallow periods, resulting in sub-optimal soil conditions for crop production. In turn, this has required more weed control and increased demands on the soil. Velvetbean technology has made the fallow more efficient; as a result, fallow periods can be shorter. In addition, its mulching effect has greatly reduced weeding labor. Farmers adopt this technology with considerable ease, incorporating the legume almost immediately. The Centro Maya Project, a joint effort of teh Rodale Institute, Centro Agronomico Tropical de Investigacion y Ensenanza (CATIE) and the Guatemalan Ministry of Agriculture (MAGA) is spreading velvetbean technology throughout the Guatemalan farmer cooperatives of Bethel, La Tecnica, Monte Sinai and la Lucha. From 1993 to 1995, on-farm trials of velvetbean intercropped with maize increased from 60 hectares to 410 hectares. Currently, 635 farmers from 58 communities are using the technology as a result of Centro Maya. Gliricidia sepium Indigenous to Mexico and Central America, G. sepium is a medium sized tree (average height is 12m) that has gained recognition as a fast-growing, multipurpose legume. It has been used as animal forage, fuel wood and medicine. It is adaptable to degraded soils, making it an important reforestation species. As an intercrop or in hedgerows, G. sepium provides fodder and fertilizer, though its rapid decomposition makes it less effective as a mulch. It can also serve as a shade and support tree for climbing species (vanilla, pepper, etc.). Farmers in the Misamis Oriental Province, Philippines plant G. sepium in hedgerows along the contours of hillsides to reduce soil erosion. More than half of the regional farmers cultivate on a slope of 15% or greater. The hedgerows, a combination or G. sepium and Napier grass (Pennisitum purpureum), reduce soil erosion by up to 90%. From 1987-1993, technicians from the International Rice Research Institute (IRRI) worked with farmers to develop and evaluate the contour hedgerow technology. Of the farmers surveyed, 96% saw the hedgerows as a way to control erosion (Hedgerows in the Philippines. 1994. In International Ag-Sieve VI(3). 1994). The Minkanao Baptist Rural Life Center's Sloping Agricultural Land Technology (SALT) incorporates a double row of G. sepium along slope contours. A cash crop is planted between each double row. Planted on the uphill side of the tree, the legume's root system, with help from rocks, branches and crop residues, stabilizes the soil and privents water erosion. At the same time, G. sepium is pruned monthly and applied as mulch. Erythrina sp. There are over 100 species of Erythrina, many of which are used ofr fodder, support for climbing plants, live fences, shade and medicinal purposes. Most species are fast-growing, long-living trees or shrubs. Erythrina is generally tolerant of regular pruning and easily propagated. In the Turrialba district of Costa Rica, rural communities are harnessing three Erythrina species: E. berteroana, E. poeppigina and E. costaricensis. E. berteroana is planted as a live fence in pastures, compensating for the scarcity of fence wire. Farmers consider E. poeppigiana the most effective shade tree for coffee and cacao, while E. cosaricensis is primarily harnessed for its medicinal value. Erythrina variegata, native to the Indian Coast and Malaysia, grows up to 25m in height and is tolerant of a wide range of soils. Farmers in India use E. variegata as a support tree for climbing crops (black pepper, grapes, yams, etc.). Rapid and straight growth makes E. variegata an ideal live fence post and shade tree. It is an excellent high protein feed for livestock, and it decomposes rapidly to enhance soil organic matter. Farmers use it as a light, durable building wood, but it is not desirable as fuel. Arachis pintoi Arachis pintoi, or Perennial Peanut, can be planted in a wide range of ecosystems, ranging from tropical rainforests to subhumid tropical rainforests. It can tolerate a wide range of soil types. In humid environments, Arachis pintoi has proved to be successful as a cover crop with a wide variety of tree crops, coffee, oil palm, citrus, pepper and grapes. It provides weed and nematode control and requires low maintenance once established. Arachis pintoi has been evaluated during the past 13 years in Central America and Mexico for its value as livestock fodder. In Guapiles, Costa Rica, A. pintoi is planted in association with vigorous tropical grasses like Brachiaria brizantha. In this association, the legume biomass increases with heavy grazing. The A. pintoi-grass association also increases beef production. Liveweight gains with A. pintoi have been 40 to 80 percent higher than on pure grass pastures. Milk production on Arachis pintoi-grass pasture has been higher than on pure grass pasture fertilized with inorganic nitrogen. Combined with star grass (Cynodon nlemfuensis), A. pintoi increased daily milk production of dual-purpose cows in Turrialba, Costa Rica by 14% GETTING STARTED Selecting the appropriate legume for a given use and environment should be done with care. Marianne Sarrantonio's "Methodologies for Screening Soil-Improving Legumes" - available in English and Spanish - is a useful aid in this process. Once you have identified the right match, legumes have great potential for improving soil health and sustaining yields. References Buckles, D. 1994. Velvetbean: A "New" Plant with a History. CIMMYT internal document submitted to the Journal of Economic Botany. Buckles, D. 1993. Velvetbean (Mucuna spp.) in the Farming Systems of Atlantic Honduras. Prepared for the 3rd Wye International Conference on Sustainable Agriculture, "Soil Management in Sustainable Agriculture." Buckles, D. and Perales, H.1995. Farmer-Based Experimentation With Velvetbean: Innovation Within Tradition. CIMMYT internal document submitted for external publication. CIDICCO Cover Crop News, Vol. 1(1) and Vol. 1(2). Glover, Nancy. 1989. Gliricidia Production And Use. Nitrogen Fixing Tree Association. Westley, Sidney B and Powell, Mark H. 1993. Erythrina in The New And Old Worlds. Nitrogen Fixing Tree Research Reports Special Issue. Argel, Pedro J. PhD. 1993. Regional Experience with Forage Arachis in Central America and Mexico. Biology and Agronomy of Forage Arachis. ------------------------------------------------------------------------ Contacts and Publications Legume Resources * The Consultative Group on International Agricultural Research, CGIAR is an informal organization of some 40 countries, international and regional organizations, and foundations whose mission it is to contribute to sustainable improvements in agricultural productivity. The following CGIAR research centers are making significant strides in work with tropical legumes. * International Crops Research Institute for the Semi-Arid Tropics, ICRISAT Patancheru 502 324 Andhra Pradesh, India Phone: (91-40)596 161 Fax: (91-40)241239 Email: icrixat@xxxxxxxxx Description: ICRISAT works to improve sustainable agriculture production with tropical legumes in the Semi-Arid Tropics. ICRISAT's three mandate legume crops are chickpea, pigeonpea and groundnut. Activities in Sout Asia are largely oriented towards pigeonpea and chickpea, and in Asia and Sub-Saharan Africa, activities involve the groundnut. The legumes Entomology Unit helops scientists develop integrated pest management (IPM) systems with special reference to host plant resistance. Regional Offices: Niger, Mali, Negeria, Zimbabwe, Kenya, Malawi * International Maize and Wheat Improvement Center, CIMMYT Lisoboa 27 Apartado Postal 6-641 06600 Mexico, D.F. Mexico Phone: (52-5)726-9091 Fax: (52-5)726-7559 Email: icrixat@xxxxxxxxx Description: CIMMYT works in developing countries to enhance the productivity of maize, wheat and triticale, specifically using legumes in maize and wheat systems. Current work in Bolivia looks at the role of leguminous cover crops in reduced and no-till systems. Crotelaria juncea, or Sunn hemp, is the current focus of this research as a cover crop in a maize rotation. Crotalaria juncea and Pennesitium americanum are also being studied there for their residual value in no-till systems between plantings of soybean and maize. Daniel Buckles, from the regional office in Mexico, has done extensive work with mucuna sp. Regional Offices: Bangladesh, Bolivia, Colombia, Costa Rica, Cote d'Ivoire, Ethiopia, Ghana, Guatemala, Kenya (Nairobi and Njoro), Nepal, Syria, Bangkok, Turkey, Uruguay, Zimbabwe * International Center for Tropical Agricultur, CIAT Tropical Forages Program Contact:Dr. P. Argel Apartado Postal 55 2200 Coronado San Jose, Cost Rica Phone: (506)290-222 Fax: (506)294 741 Email: pargel@xxxxxxxxxx Description: CIAT researches the production related problems of beans (Phaseolus), cassava, rice and tropical pastures. The Tropical Forage Program of CIAT emphasizes the use as soil covers and green manures. CIAT's tropical forage gene bank holds one of the largest collection of forage legumes in the world. * International Rice Research Institute, IRRI P.O. Box 933 1099 Manila PHILIPPINES Phone: (63-2)818-1926/812-7686 Fax: (63-2)818-2087 Email: r.huggan@xxxxxxxxx Description: IRRI has been actively working with aquatic legumes (azolla) and with Sesbania and Gliricidia used as green manure in lowland rice. Food, forage and tree legumes are incorporated in rice-based cropping systems. * Heifer Project International, HPI Contact: Jerry Aaker PO Box 808 1015 South Louisiana Little Rock, Arkansas 72203 Phone: (501) 376-6836 Fax: (501) 376-8906 Email: 72754.2400@compuserve Description: HPI assists people by supplying food producing animals and related educational materials. Legumes are a part of most projects at HPI. Legumes such as Leucaena, Calliandra and Sesbania are used in their projects as fodder, erosion control and building materials. Heifer Project International publishes a bi-monthly newsletter called The Exchange, which is devoted to small scale animal production in developing areas. Subscriptions are $10 per year (US) and free to developing countries and resource-poor farmers. * International Cover Crop Clearinghouse, CIDICCO Contact: Milton Flores, Director Apartado Postal 4443 Tegucigalpa, M.D.C., HONDURAS C.A. Phone: (504) 32-7471 Fax: (504)39-9896 Email: cidicco@xxxxxxxxxxxxxxx Description: CIDICCO is involved in tropical legumes research and education. They work closely with farmers in Honduras to incorporate green manures into traditional cropping systems. Their newsletter, "Cover Crop News," contains useful information on tropical legumes. * Mennonite Central Committee, MCC Contact (Bolivia): Agriculture Advisor Comite Central Menonita Casilla 213 Santa Cruz, Bolivia Phone: (591) 334-3773 Fax: (504) 39-9896 Email: mcc.bolivia@xxxxxxxxxxxxxxxxxxxxx Contact (Bangladesh): Amal Krishna Roy Principal Technical Officer Agriculture Program, Mennonite Central Commitee P.O. Box #5, Maijdee Court, Noakhali-3800, BANGLADESH Description: In Bolivia, MCC promotes the use of leguminous trees in pasture systems for forage, shade and live fence posts. At the MCC Research Station in Bangladesh, Sesbania aculeata and Sesbania rostrata were studied for their effect as green manures on the subsequent rainy season rice crop. * Nitrogen Fixation by Tropical Agriculture Legume, NifTAL Contact: Paul Singleton University of Hawaii 1010 Holomua Rd. Paia, Maui, HI 96779-9744 Phone: (808) 579-9568 Fax: (808) 579-8516 Description: The University of Hawaii's NifTAL Center is an interdisciplinary center for the study of biological nitrogen fixation and soil management resources. NifTAL provides an integrated package of BNF and soil management needs assessment, applied research, training, technology transger, and private enterprise development. * Nitrogen Fixing Tree Association, NFTA Contact: Mark Powell Rt. 3, Box 376 Morrilton, Arkansas 72110 USA Phone: (501) 727-5435 Fax: (501) 727-5417 Email: receptionist@xxxxxxxxxxx Description: NFTA promotes the use of nitrogen fixing trees to improve the soil, protect the environment and enhance the well-being of farm families and other land users. NFTA publishes "NFT Highlights," a series of fact sheets highlighting different legumes and "Network News," which provides update for NFTA network members. NFTA gan an extensive list of publications for sale. * On Farm Productivity Enhancement Program Contact: Mary-Lou Surgi Bird Building Western Carolina University Cullowhee, NC 28723-9056 USA Phone: (704) 227-7492 Fax: (704) 227-7422 Email: pvouc@xxxxxxxxxxxxxx Description: The On-Farm Productivity Enhancement Program (OFPEP) at the PVO/University Center uses biological nitrogen fixation (BNF) and legume management techniques to enhance soil fertility, improve soil management practices and seed quaility for farmers in Senegal, The Gambia and Uganda. On farm Research includes rhizobial trials in Ghana. "Of Soil and Seeds" is the newsletter of teh OFPEP and includes updates on project work. * World Neighbors Contact: Gregg Biggs 4127 NW 122nd Street Oklahoma City, OK 73120-8869 USA Phone: (405) 752-9700 Fax: (405) 752-9393 Email: info@xxxxxxxxxxxxxxxxxxxxxxxx Description: World Neighbors works with marginalized communities to meet their basic needs. In Mexico, Mucuna sp. and Gliricidia sepium are incorporated into their projects to help regenerate and maintain soil fertility. In Nepal, Mucuna sp. is used as green manure and fodder in fruit trials. Researchers * Roland Bunch COSECHA Apartado 3586 Tegucigalpa HONDURAS Phone: (504) 76-2256 Fax: (504) 76-2354 Description: Roland Bunch, author of "Two Ears of Corn," promotes people-centered development in Latin America. Bunch has extensive knowledge and experience with legumes. * Edwin C. French Agronomy Department Institute of Food and Agricultural Sciences 304 Newell Hall P.O. Box 110500 Gainsville, FL 32611-0500 USA Phone: (904) 392-1811/8896 Email: ecf@xxxxxxxxxxxxxxxx Description: French has done extensive reserach and development of Arachis glabrata. * William Loker Department of Sociology & Anthropology P.O. Drawer C Mississippi State University Mississippi State, MS 39762 USA Phone: (601) 325-1663 Fax: (601) 325-8690 Email: wloker@xxxxxxxxxxxxxxx Description: Loker has worked extensively with tropical legumes, especially forage legumes in the Peruvian Amazon. He has worked with CIAT's on-farm research on nitrogen fixing trees in tropical agroecosystems. * B. Rajasekaran Consortium for International Earth Science Information Network 2250 Pierce Road University Center, MI 48710 USA Phone: (517) 797-2749 Fax: (517) 797-2622 Email: raja@xxxxxxxxxx Description: Rajasekaran has done extension work in India promoting the cultivation of Black Gram (Vigna mungo) and Green Gram (Vigna radiata). He has also researched the integration of indigenous and scientific knowledge of legumes. * Ancha Srinivasan Maezato, Ishigaki Okinawa 907 JAPAN Phone: 81 9808 22306 Fax: 819808 20614 Email: ancha@xxxxxxxxxxxxxxxxxxxxx Description: Srinivasan has been examining heat tolerance in legumes. Her research has included work with Chickpea, Groundnut, Pigeonpea and Soybean in the subtropics of Japan. Resources * Directory of BNF Resource Persons in Developing Countries NifTAL Project, University of Hawaii. Description: Lists inoculant producers, researchers, extension personnel, teachers and others linked by an interest in BNF. The directory includes contacts from 71 countries. Free copies can be obtained by contacting NifTAL (see address above). * International Legume Database and Information Service ILDIS Coordinating Centre Department of Biology University of Southampton Southampton SO16 7PX UK Phone: 44 1703 594269 Fax: 44 1703 592444 Email: ildis@xxxxxxxxxxx Description: The ILDIS project is continually adding to a database of legume species, subspecies and varieties. They are currently merging data sets from around the world. ILDIS publishes the ILDIS Newsletter. * Legume Seed Source Directory (1992) Contact: Radale Institute 611 Siegriedale Road Kutztown, PA 19530 Phone: (610) 683-1459 Fax: (610) 683-8548 Description: This 23 page directory lists legume sources by both common and Latin names. It provides a listing of seed companies and cross references legumes, inoculants and seed companies. Cost: Free with Methodolgies for Screening Soil-Improving Legumes (below). * Methodologies for Screening Soil-Improving Legumes (1991) Author: Marianne Sarrantonio Contact: Rodale Institute 611 Siegfriedale Road Kutztown, PA 19530 USA Phone: (610) 683-1459 Fax: (610) 683-8548 Description: A 340-page field manual for selecting and growing legumes for soil improvement. Useful for both the beginner and the expert, this readable illustrated guide describes how to determine if your land would benefit from legume production and if so which ones. Readers with a minimum of experience in agricultural research can use the book as a teaching aid to carry out field trials to identify and test various soil-building legumes. Cost: US $23. * New Forests Project Contact: Stuart Conway 731 Eighth Street, S.E. Washington, D.C. 20003 USA Phone: (202) 547-3800 Fax: (202) 546-4784 Description: The New Forests Project provides tree seeds, technical information and training materials free to groups worldwide interested in starting reforestation projects with fast growing, leguminous trees. Available for immediate destribution are seeds of Leucaena leucocephala, Gliricidia sepium, Robinia pseudoacacia and Prosopis juliflora. Please include an environmental description of your area. * Oxford Forestry Institute Contact: Alan Pottinger Department of Plant Sciences University of Oxford Douth Parks Road Oxford OX1 3Rb UK Description: The Oxford Forestry Institute has several species of Leucaena available for distribution to those interested in joining the Leucaena trial network. The network's purpose is to compare lesser known species of Leucaena with more commonly used species. * The Leucaena Research and Develpment Network Contact: Dr. Max Shelton Department of Agriculture University of Queensland Brisbane, Queensland 4072 AUSTRALIA Fax: 61-7-365-1188 Email: m.shelton@xxxxxxxxxxxxxxxx Description: LEUCNET is an informal network of scientists, extensionists and tree growers working to improve the productivity and utility of Leucaena. Their newsletter, Leucnet News, is published every 6 to 12 months and provides a medium for information exchange and distribution of Leucaena seeds. Internet * The Crop Expert http://www.hort.purdue.edu/newcrop/ Description: A listing of legume scientists in the United States, their area of expertise, and contact information. * CGIAR Home Page http://www.worldbank.org/html/cgiar/centers.html Description: This home page connects you to the Web pages for each of the CGIAR affiliates. These pages include contact information, and information on CGIAR projects. * The FAO Tropical Feeds Database http://ifs.plants.ox.ac.uk/fao/tropfeed/tropfeed.htm Description: The database provides an extensive list of tropical legumes with a description of each, accessible by latin or common name. * The Bean Bag Contact: Joseph H. Kirkbride, Jr. USDA, Ag. Research Service Systematic Botany and Mycology Lab. Room 304, Building 011A Beltsville, Maryland 20705-2350 USA Phone: (301) 504-9447 Fax: (301) 504-5810 Email: jkirkbri@xxxxxxxxxxxxxxxx http://www.rbgkew.org.uk/herbarium/legumes/legumes.html Description: Kirkbride is the senior editor of the Bean Bag, a newsletter for legume research scientists. The Bean Bag appears in May and November and can be accessed via the world wide web at the above address. -- __________________________________________________________ Sign-up for your own FREE Personalized E-mail at Mail.com http://www.mail.com/?sr=signup