Notas Técnicas de ECHO son publicaciones que tratan específicamente a un tema importante para aquellos que trabajan en los trópicos y subtrópicos. Nuestro material es escrito por funcionarios de ECHO y escritores ajenos, los cuales tienen experiencia y conocimientos con la técnica. Estos documentos están disponibles de forma gratuita y ¡esperamos que sean valerosos para su biblioteca de recursos en el desarrollo de agricultura!

93 Contenido (Mostrando Ediciones 24 - 15) |

TN #24 Onions in the Tropics and Subtropics - 1/1/1992

A case could be made that onions are one of two universal vegetables that are cherished in almost every culture, tomatoes being the other. Both are difficult to grow in many tropical and subtropical climates. Where a vegetable is both popular and difficult to grow, it brings a good price. If a way can be found to grow that crop, both local farmers and consumers benefit. While attending a horticulture conference in Honduras, Scott Sherman and I had an opportunity to visit with onion specialist and international consultant, Dr. Lesley Currah. She travels the world working with onion researchers.

TN #23 Living Fence - 1/1/1991

There are several reasons for establishing fences on the small farm. Fences are used to:

  1. To mark boundary lines between farms or next to roads.
  2. To separate adjacent fields used for distinct purposes
  3. To protect and keep animals from straying
  4. To protect crops from animal damage

A fence represents a major investment on the small farm. Although it carries a cost, it also provides something of benefit, namely protection. It is often a challenge to small farmers to increase farm production, such as crop yield, and the use of fences can facilitate such improvements. Whereas a fence may facilitate yield increase on the farm, a living fence can improve the efficiency of the production as well.

“Major” fences are usually constructed of poles and wire. “Minor” fences, such as those used for fencing small animals or kitchen gardens, may be constructed entirely of wood, or of a combination of materials, such as poles, slats, and woven or welded wire. Both major and minor fences may be constructed of living posts, reducing initial costs of the fence. Additionally, living posts last longer than wooden (dead) ones, thereby reducing maintenance costs as well.

Living fences are commonly used in a wide range of ecological situations, from semi-arid to rain forest conditions. Suitable plant materials are available for almost all ecological regions and conditions.

What’s Inside:

  • Benefits
  • Disadvantages
  • Establishment and Care
  • Species for Living Fences

TN #22 Guinea Pigs for Meat Production - 1/1/1991

The high protein and high concentration of B vitamins found in meat make it an ideal part of the diet, very difficult to replace by plant foods, even with grain legumes that are nutritionally the closest plant foods to meat. Yet production of meat on the small farm almost dictates a way of life with several disadvantages. If small animals are raised in pens they usually require purchased concentrates or grains used for the family, at least as part of the diet. If allowed to roam freely they make it impossible to maintain a dooryard vegetable garden, and make good hygiene difficult. Furthermore, if the family cannot eat the entire animal at one meal, refrigeration is required or other preservation techniques.

The guinea pig or cavy, Cavia porcellus, is a rodent that was domesticated in the Andes as a source of meat. Because it is a small animal it can be eaten by a small family in one meal and does not require refrigeration. It is herbivorous and becomes accustomed to many sorts of feed. The meat is much like rabbit, and is low in fat content. Furthermore, the cavy multiplies rapidly, but not at the rate that folk literature would suggest. With breeding as recommended here, one pair of cavies could produce about 260 new pairs in 2 years.

TN #21 Pigeon Pea - 1/1/1990

I often tell folks that ECHO specializes in growing food under difficult conditions. The pigeon pea, Cajanus cajan, is a prime example of a tough but nutritious plant for just such cases. This article is directed toward two audiences. For some of you, pigeon pea is already an important crop. You will mainly be interested in the information about and seed of vegetable pigeon pea varieties. For others who are not familiar with pigeon pea at all, the general discussion of pigeon pea is for you. (The following information is gleaned from a very helpful book, Pigeon peas: a Valuable Crop of the Tropics, by Julia Morton, Roger Smith, A. Lugo-Lopez and R. Abrams, available from Dr. Eduardo Schroder for $7.00 at Dept. of Agronomy, University of Puerto Rico, Mayaguez, PR 00709-5000, USA.)

TN #20 Como Seleccionar las Mejores Plantas para la Finca Tropical de Subsistencia - 1/1/2007

Por Dr. F. W. Martin. Publicado en partes, 1989 y 1994; revisado en 1998 y 2007 por personal de ECHO

Aunque casi todas las plantas son útiles de alguna manera, no todas son igualmente valiosas. Por ejemplo, el trigo, el arroz y el maíz pueden ser considerados las plantas más valiosas en el mundo a base de la enorme extensión de hectareas sembrados con estos cultivos, su papel vital en cuanto a alimentar a la humanidad, y su enorme valor económico. Usando distintos criterios, uno puede considerar 10, 25 ó hasta 200 especies como las plantas más valiosas del mundo. Aún así, bajo ciertas situaciones, para algunas personas o por algun razón especial, otras plantas producidas y usadas en escala muy pequeña podrían ser consideradas preciosas e indispensables. Por tanto, la pregunta “¿Cuáles son las plantas más valiosas para la finca pequeña”? resulta enormemente importante.

TN #19 Maize - 1/1/1989

Maize (Zea mays; corn) is the third most important food crop in the world, surpassed only by two other grains, wheat and rice. Maize is a widely adapted crop, capable of production during the appropriate season in almost all parts of the world where farming is done. Maize is represented by thousands of varieties, some producing in as little as 70 days, others needing up to 9 months to reach maturity. Furthermore, maize is represented by a number of distinct races that evolved in Mexico and Central and South America, its geographical origin. These groups hybridize freely.

TN #18 Sweet Potato - 19/1/1988

Sweet potatoes (Ipomoea batatas) are already the 6th or 7th most produced food crop in the world, surpassed only by wheat, rice, corn, potato, barley, and possibly cassava. Among the reasons that sweet potato is a great crop is that it is relatively easy to grow, relatively free of pests and diseases, has relatively high productivity, and is always good food, principally starch, some protein and vitamin C, and, in orange varieties, rich in vitamin A. In addition, the young leaves, rich in protein and most vitamins, are also good food. Furthermore, the sweet potato is an excellent animal food.

Its ability to produce in poor soils makes the sweet potato an especially good crop for poor tropical soils where fertilizer is not available. If the leaves are also used as food, sweet potato will probably produce more nutrients per acre than almost any other crop under those conditions. (The other tropical crop that produces well on poor soils and also has both edible roots and leaves is cassava. It has an advantage over sweet potato in drought tolerance, but sweet potato has the advantage in nutrients. That is because substances called polyphenols in the cassava leaf combine with protein during cooking and reduce the amount of protein that is digestible.)

Nevertheless, like all crops the sweet potato must be produced with understanding in order to obtain maximum yields. It should never be treated with neglect.

What's Inside:

  • WHY GROW SWEET POTATOES?
  • CLIMATIC, SOIL, AND OTHER REQUIREMENTS FOR GROWING SWEET POTATO
  • CULTURE
  • HARVEST & STORAGE
  • PRINCIPLE USES OF SWEET POTATOES

TN #17 Soybean - 1/4/1988

The soybean (Glycine max) is one of the most important food plants of the world, and seems to be growing in importance. It is an annual crop, fairly easy to grow, that produces more protein and oil per unit of land than almost any other crop. It is a versatile food plant that, used in its various forms, is capable of supplying most nutrients. It can substitute for meat and to some extent for milk. It is a crop capable of reducing protein malnutrition. In addition, soybeans are a source of high value animal feed.


Nevertheless, the soybean is adapted primarily to the Temperate Zone. Each improved variety has an adaptation determined in large part by latitude. Soybean requires careful home processing to bring out its best qualities, and if not well prepared, it has an off-flavor that is seldom appreciated.

TN #16 Agricultura Tropical en Pequeña Escala: Guia Para Principiantes - 1/4/1988

¿Entones usted quiere ayudar a la gente que vive en el trópico? ¡Maravilloso! El trópico está esperando por usted. No importa cuáles sean sus habilidades, usted puede mejorar la vida de otras personas que viven en el trópico. La preocupación que usted tiene por el bienestar físico y
espiritual de la gente puede traducirse en un servicio que rinda frutos. Su primer activo es su buena voluntad, su voluntad de servicio.

A medida que comience a familiarizarse con el trópico, se dará cuenta de que los problemas comunes incluyen la producción y el uso de alimentos. Entre los pobres, que son quienes más necesitan de su ayuda, obtener el pan de cada día es una preocupación constante. Esto no sólo es un asunto de comer, en primer lugar es un asunto relacionado con la producción, en segundo lugar con la distribución y el  almacenamiento, y en tercer lugar con la preparación de alimentos y una dieta balanceada.

TN #15 Moringa Recipes - 1/1/1988

"Of all parts of the tree, it is the leaves that are most extensively used. The growing tips and young leaves are best. [However, we sometimes pull the leaflets off in our hands and cook them without regard to age]. Unlike other kinds of edible leaves, benzolive leaves do not become bitter as they grow older, only tougher. When you prepare the leaves, always remove them from the woody stems, which do not soften. [We did not know this the first time we served them. It was almost like having wire in the dish]. "The leaves can be used any way you would use spinach. One easy way to cook them is this: Steam 2 cups freshly picked leaves for just a few minutes in one cup water, seasoned with an onion, butter and salt. Vary or add other seasons according to your taste. In India leaves are used in vegetable curries, for seasoning and in pickles. Let your imagination be your guide."