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Stopping a silent killer February 12th, 2017 by

Mycotoxins are poisons produced by common mold fungi. The best known examples are aflatoxins, produced by Aspergillus, which are of increasing concern worldwide because they contaminate  many types of stored foods, including groundnuts (peanuts), manioc, maize (corn) and chilli. Aflatoxins affect the health of people and animals and are powerful carcinogens if  enough is consumed. Like many successful poisons, aflatoxins are invisible and tasteless, so they are tricky to manage.

sorting groundnutsThe other week, I was in Chuquisaca, Bolivia, with Paul and Marcella from Agro-Insight, making a video for farmers on how to manage molds and reduce contamination of food. Part of the solution is surprisingly low-tech.

The first step is to recognize the molds. They look like a dark green powder, growing between the pink skin of the peanuts and the white layer of the shell around them. Farmer Dora Campos explains that the people in her village, Achiras, used to dismiss the molds, saying simply that the pods were rotten. Farmers would salvage the bad nuts by feeding them to pigs or chickens, and some people would even eat the rotten nuts. Thanks to what they’ve learned in recent years, the villagers now bury the spoiled peanuts.

Aspergillus survives on organic matter in the soil, within easy reach of peanut pods, for example. Antonio Medina showed us how he dried his peanut pods off the ground, as soon as they are harvested, to stop the mold contaminating them. This keeps the nuts as clean and dry as possible.

Like most fungi, Aspergillus needs water to thrive. Don Antonio shows us how the farmers pick through the whole pile of harvested peanuts, after drying, when the pods are cleaner and the bad ones are easier to spot. The farmers go through the harvest one pod at a time, discarding all of the spoiled or discolored pods. It takes time, but it is a technique that smallholders can use to produce a high-quality product, based on thoughtfulness and hard work.

Agronomist Edwin Mariscal is trying a simple solar dryer with many of the farmers he works with. Mr. Mariscal introduces us to Santiago Gutiérrez, who has built one of the dryers: a wooden frame raised off the ground and covered with a sheet of tough, sun-resistant plastic. Mr. Mariscal has been working with similar dryers in the field, with farmers for years. The dryers started as a metal version for drying peaches, but experience showed that the dryers worked just as well if they were made from wooden poles cut on the farm.

Don Santiago, and his wife Emiliana, explain that the dryer works beautifully. Peanuts dry even in the rain. The family can also put maize and chilli into the structure, to dry those foods free of aflatoxin.

You can keep deadly aflatoxins out of food by following a few simple principles, including harvesting on time (not too late, or the Aspergillus has more time to get into the pods). Keep the produce off the ground. Dry it out of the rain and remove the moldy pieces. Store produce in a cool, dry place, off the floor.

Ackowledgement 

Thanks to Fundación Valles for information for this article, and for supporting our filming in the field.

Further viewing

Sign up for the D-group at Access Agriculture to get an alert when this video is posted on www.accessagriculture.org.

EVITAR UN ASESINO SILENCIOSO

Por Jeff Bentley, 12 de febrero del 2017

Las micotoxinas son venenos producidos por mohos de hongos comunes. Los ejemplos más conocidos son aflatoxinas, producidas por Aspergillus, que son de interés actual porque contaminan muchas clases de alimentos almacenados, incluso manís (cacahuates), yuca, maíz y chile (ají). Las aflatoxinas afectan la salud de la gente y de los animales y son  cancerígenos poderosos si se consume lo suficiente. Como muchos venenos exitosos, las aflatoxinas son invisibles y sin sabor, entonces son difíciles de manejar.

maize, chilli and groundnut in solarLa otra semana, estuve en Chuquisaca, Bolivia, con Paul y Marcella de Agro-Insight, haciendo un video para agricultores sobre cómo manejar mohos y reducir la contaminación de los alimentos. Felizmente, parte de la solución es el uso de tecnología apropiada.

El primer paso es reconocer a los mohos. Parecen un polvo verdusco oscuro, que crece entre la piel roja del maní y la capa blanca de la cáscara. La agricultora Dora Campos explica que antes, la gente de su comunidad, Achiras, no daba importancia a los mohos, diciendo simplemente que  las vainas estaban podridas. Los agricultores rescataban los manís malos, dándoles de comer a sus chanchos o gallinas, y algunas personas hasta comían los granos podridos. Gracias a lo que han aprendido en los últimos años, ahora los comuneros saben enterrar los granos podridos.

Aspergillus sobrevive en la materia orgánica del suelo, al alcance de las vainas de maní, por ejemplo. Antonio Medina nos mostró cómo él secaba sus vainas en un toldo al cosecharlas, para evitar que el moho las contamine. Eso ayuda a mantener a los manís limpios y secos. Como la mayoría de los hongos, el Aspergillus necesita agua para vivir.

Don Antonio nos muestra cómo los agricultores escogen todos los manís cosechados, después de secarlos, cuando las vainas son más limpias y es más fácil ver las malas. Los agricultores revisan toda su cosecha, una vaina a la vez, descartando las vainas malas o descoloridas. Toma tiempo, pero es una técnica que los campesinos pueden usar para producir un producto de alta calidad, trabajando en forma consciente.

El Ing. Edwin Mariscal está probando un simple secador solar con varias familias. El Ing. Mariscal nos presenta a Santiago Gutiérrez, que ha construido uno de los secadores: una tarima de palos como una mesa, cubierto de una hoja de plástico fuerte y resistente al sol. El Ing. Mariscal ha trabajado con secadores parecidos en el campo, con agricultores, durante varios años. Los secadores empezaron como una versión metálica para secar duraznos, pero la experiencia mostró que los secadores funcionaban igual si se hacían de palos cortados en la zona.

Don Santiago, y su esposa Emiliana, explican que el secador funciona bien bonito. Los manís secan hasta en la lluvia. La familia también lo usa para secar maíz y ají, para evitar aflatoxina en ellos.

Se puede mantener los alimentos libres de las aflatoxinas letales siguiendo unos principios sencillos, como cosechar a tiempo (no muy tarde, o el Aspergillus tendrá más tiempo para entrar a las vainas). No secar el producto en el suelo. Evitar que entre la lluvia al producto y saque las piezas podridas. Almacene en un lugar seco y fresco, no en el piso.

Agradecimiento

La Fundación Valles nos proporcionó información para este artículo, y apoyó nuestra filmación en el campo.

Para ver más

Puede inscribirse para el D-group en Access Agriculture para recibir una alerta cuando este video se suba al www.accessagriculture.org.

 

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Crop with an attitude January 29th, 2017 by

A plant has a personality and, like people and countries, some have stronger characters than others. Take the lupin bean (Lupinus mutabilis), for example. It is an oddly erect legume that forms a sort of cone shape, and its glorious flowers make the plant wildly popular with gardeners in many countries. In Bolivia it is called “tarwi”, from Quechua, the language of the Incas.

tarwi in bloomWhile making a video in Bolivia, my colleagues and I asked doña Eleuteria in the village of Phinkina to tell us what she planted after harvesting tarwi. She surprised me by saying that sometimes she followed tarwi with potatoes. That’s astounding, because potatoes are such a demanding crop that Andean farmers often rest the soil for years before planting a field to potatoes. Otherwise the soil may be improved by adding tons of chicken manure. Bolivian farmers in the Andes don’t buy manure for other crops, just the fussy and valuable potato.

I followed up by asking Reynaldo Herbas, from the village of Tijraska, if he had ever planted potatoes right after tarwi. “Yes, and it does very well. Planting tarwi is like fallowing your soil, or like using chicken manure,” he explained.

Tarwi seeds are also rich in oils and proteins and doña Eleuteria regularly feeds lupin beans to her children. Like some other Bolivians doña Eleuteria make a nutritious snack by boiling the seeds, but it’s a lot of work. The grains need to be soaked in water for three days before boiling, then left in the running water of the river for several days to wash out the bitter alkaloids.

Agronomist Juan Vallejos from Proinpa (a research institute) confirmed that tarwi takes a lot of water to process. This is ironic, because tarwi is recommended for dry areas with impoverished soils. Sweet varieties without the bitter alkaloids do exist, but in Bolivia the search for these sweet lupins is only just starting.

sorting tarwi or lupine seedWhile visiting doña Eleuteria to learn about processing seed, she showed us how to pick out the bad grains of tarwi, to ensure that the crop planted from them would be healthy. (The main disease is anthracnose, caused by the fungus Colletotrichum gloeosporioides). We asked doña Eleuteria what she did with the diseased grains. We thought that she might say that she buried them to keep the disease from spreading. But no, she buries the discarded grains because raw lupin beans are toxic, whether they are healthy or diseased.

“I do bury them,” she explained, “because they are so bitter that if the chickens eat them they will die.”

Agronomist Vallejos explained that tarwi plants are so packed with alkaloids that sheep and cattle will not touch a crop growing in the field. However, the lupin plant is drought resistant and even withstands hail, which often mows down other food crops in the Andes. Local governments in Bolivia are starting to promote tarwi as a way of adapting to climate change.

A plant may have a complex personality, with sterling qualities as well as some tragic defects. Tarwi or lupin is in many ways a perfect crop: well-suited to the punishing climate of the High Andes while nutritious for people and good for the soil. The downside is that you need lots of water to process the beans and to leach out the poisons that can kill your unsuspecting chickens.

Acknowledgements

For this story in Cochabamba, Bolivia, I was fortunate enough to be accompanied by Paul Van Mele and Marcella Vrolijks of Agro-Insight and Juan Vallejos and Maura Lazarte and others from Proinpa. The visit was funded by the McKnight Foundation.

Further reading

Calisaya, J.J.,  M. Lazarte, R. Oros, P. Mamani 2016 “Desarrollo Participativo de Innovaciones Tecnológicas para Incrementar la Productividad de los Suelos Agrícolas en Regiones Andinas Deprimidas de Bolivia.” Read at the Community of Practice meeting, McKnight Foundation, Ibarra, Ecuador 11-16 July. See the paper here.

Further viewing

The farmer training video “Growing a good lupine crop” will be hosted on the Access Agriculture website shortly in English, Spanish, Quechua and Aymara.

CULTIVO CON CARÁCTER FUERTE

Por Jeff Bentley

29 de enero del 2017

Una planta tiene una personalidad, y como la gente y los países, algunos tienen más carácter que otros. Considere el lupino (Lupinus mutabilis), por ejemplo. Es una leguminosa que crece casi en forma de cono, y gracias a sus flores gloriosas la planta es querida por jardineros en muchos países. En Bolivia se llama “tarwi”, del quechua, el idioma de los Incas.

Mientas mis colegas y yo filmábamos un video en Bolivia, pedimos que doña Eleuteria en la comunidad de Phinquina nos contara qué sembraba después de cosechar el tarwi. Ella nos sorprendió cuando dijo que a veces sembraba papa después del tarwi. Es increíble, porque las papas son tan exigentes que muchos agricultores andinos descansan el suelo durante años antes de sembrar papas. Si no, el suelo tendrá que mejorarse agregando toneladas de gallinaza. Los agricultores en los Andes bolivianos no compran gallinaza para otros cultivos, solo la mimada y valiosa papa.

Luego le pregunté a Reynaldo Herbas de la comunidad de Tijraska, si él jamás había sembrado papas después del tarwi. “Sí, y produce muy bien. El sembrar tarwi es como descansar sus suelo, o como usar gallinaza,” explicó.

Marcella films Eleuteria soaking tarwiLos granos de tarwi son ricos en aceites y proteínas y doña Eleuteria a menudo los da de comer a sus hijos. Igual que algunas otras bolivianas, doña Eleuteria hace una merienda nutritiva con los granos cocidos, pero cuesta mucho trabajo. Los granos tienen que remojarse en agua durante tres días antes de cocerse, para después dejarlos en el chorro del río durante varios días más para expulsar los amargos alcaloides.

El Ing. Agrónomo Juan Vallejos de Proinpa (un instituto de investigación) confirmó que el tarwi toma mucha agua para procesarse. Es irónico, porque el tarwi se recomienda para zonas secas con suelos empobrecidos. Existen variedades dulces, sin los alcaloides amargos, pero en Bolivia recién empieza la búsqueda por esos lupinos dulces.

Cuando visitamos a doña Eleuteria para aprender cómo ella procesa la semilla, nos mostró cómo quitar los granos malos de tarwi, para asegurarse que el cultivo que siembra será sano. (La enfermedad principal es la antracnosis, causada por el hongo Colletotrichum gloeosporioides). Preguntamos a doña Eleuteria qué hacía con los granos enfermos. Pensábamos que diría que los enterraba para que las enfermedades no se diseminaran. Pero no, ella entierra a los granos descartados porque los granos crudos de tarwi son tóxicos, bien sea sanos o enfermos.

Eleuteria Sanchez burries bad lupine seed as chicken will die if they eat it“Los entierro,” explicó, “porque son tan amargos que si las gallinas se los comen podrían morirse.”

El Ing. Vallejos explicó que las plantas de tarwi están tan cargadas de alcaloides que las ovejas y vacas no tocan al cultivo en la parcela. Sin embargo, la planta de tarwi es resistente a la sequía y hasta aguanta a la granizada, que a menudo arrasa con otros cultivos en los Andes. Los gobiernos locales en Bolivia empiezan a promover el tarwi como una adaptación al cambio climático.

Una planta puede tener una personalidad compleja, con cualidades de oro igual que algunos defectos trágicos. El tarwi o lupino en muchas maneras en el cultivo perfecto: bien adaptado a los desafíos del clima altoandino, mientras es nutritivo para la gente y bueno para el suelo. Su lado oscuro es que requiere de mucha agua para lavar los venenos que pueden matar a tus gallinas inocentes.

Agradecimientos

Para escribir este cuento en Cochabamba, Bolivia, tuve la buena suerte de estar acompañado de Paul Van Mele y Marcella Vrolijks de Agro-Insight y Juan Vallejos y Maura Lazarte y otros de Proinpa. La visita se financió por la McKnight Foundation.

Para leer más

Calisaya, J.J.,  M. Lazarte, R. Oros, P. Mamani 2016 “Desarrollo Participativo de Innovaciones Tecnológicas para Incrementar la Productividad de los Suelos Agrícolas en Regiones Andinas Deprimidas de Bolivia.” Trabajo presentado en la reunión de la Comunidad de Práctica, McKnight Foundation, Ibarra, Ecuador 11-16 de julio. Ver la presentación aquí.

Para ver más

El video educativo para agricultores “Producir tarwi sin enfermedad” se colocará pronto en el sitio web de Agriculture en inglés, español, quechua y aymara.

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Why people drink cow’s milk January 15th, 2017 by

Nutritionists and physicians have started to question milk-drinking, suggesting that many consumers eat far too much dairy. Dr. Michael Klaper has even suggested that milk is just “baby calf growth fluid”, designed to “turn a 65 pound calf into a 400 pound cow”, and that unless you have long ears and a tail, you should never drink the white stuff (https://www.youtube.com/watch?v=toZ7Mr-ClCE).

In other words, Dr. Klaper argues that cow´s milk should be avoided because it was designed as calf food. But his reasoning is absurd reductionism, because most of what humans eat was meant to be something else, not people food. Wheat grains were intended to be seed, not flour. Honey is supposed to tide the hive over the lean season, not to be added to pastry. Fish certainly did not evolve so that people could make sushi.

sun, cow, strange toolSo why do people eat dairy products?

Before agriculture, all humans were hunters-and-gatherers. They ate meat when they could (but seldom as much as people who get their food from the supermarket). They ate a bit of fat (wild animals can be pretty lean). Fish were part of the diet in many places and so were insects in a few areas where other sources of animal protein were scarce. Honey was occasionally on the menu, but no processed sugar. Some grains were eaten, but not much, because large-seeded grasses were not very common in the wild. The ancestral human diet was mostly fruit, nuts, roots, tubers and vegetables, and no milk.

peris Njenga dairy farmerThis began to change about 8500 BC when wheat and a handful of other crops were dom
esticated in the Near East (Zohary et al. 2012). Studies at the site of Çatal Hüyük, in what is now Turkey, suggest that farmers began to domesticate cattle at that same time. But the transition to agriculture was gradual, and early farmers still hunted; most of their meat still came from the wild. Livestock only began to provide most of the meat for Near Eastern farmers about 7500 BC, around 1000 years after the beginning of animal domestication (Helmer and Vigne 2007). It seems that then as now, farmers were adapting gradually, experimenting as they went.

loading milk cans on wagonDaniel Helmer (a specialist in the ancient Near East) and Jean-Denis Vigne (a zoo-archaeologist) suggest that during these early centuries of animal rearing, domestic animals were not kept so much for their meat, but for other products like traction, skin, hair, and manure, but most of all for milk. Archaeological evidence (especially remains of milk residues on pottery sherds) suggests that dairying was established by about 7000 BC in the Near East, and by about 5900-5700 BC in Britain, and in central Europe (Helmer and Vigne 2007).
Over the centuries, ancient farmers selected for cows that gave more milk. The modern dairy cow yields around 40 liters of milk a day during the first month of lactation, far more than the calf can drink. Milking allowed farmers to take food from their livestock every day, without killing the animals. The milk was rich in fat and protein, both of which were scarce in early agricultural diets.

piles of cheeseThere was one problem with ancient dairying; most people could not digest lactose, the natural sugar in milk. Human babies can digest the lactose in their mothers’ milk, but most lose this ability in adulthood.

Humans managed to eat milk products in two ways. One was to make cheese or other fermented products, where the yeast or lacto-bacteria broke down the lactose. The second way: some peoples evolved a genetic ability to absorb lactose, a trait governed by a single, dominant gene. Anthropologist William Durham asked why people would evolve the ability to digest fresh milk, if they could simply make it into easily digestible cheese. There must be a high adaptive advantage to being able to digest fresh milk, since in some populations, e.g. in Northern Europe, nearly 100% of the population has the genetic ability to digest fresh milk. It turns out that fresh milk is rich in vitamin D, which allows easy absorption of calcium. Durham reasons that this conferred a special advantage on people in cold countries, where they did not always get enough sunlight to synthesize their own vitamin D.

Fulani woman selling snacksIt is also possible that when people had been raising cows for centuries, and milk was abundant, people who could drink fresh milk were better fed than their neighbors, and so the milk-drinking gene spread through the population. That is my guess, but there is no doubt that the modern people who can drink milk are the ones whose ancestors tended cows in ancient Europe, Africa or South Asia.

If your ancestors were not dairying folks, you may be lactose intolerant. If you can drink milk, you can thank your forbearers who herded cows and put milk on the table.

Further reading

Durham, William H. 1991 Coevolution: Genes, Culture and Human Diversity. Stanford: Stanford University Press. Pp. 228-259.

Helmer Daniel and Jean-Denis Vigne 2007 “Was Milk a ‘Secondary Product’ in the Old World Neolithisation Process? Its Role in the Domestication of Cattle, Sheep and Goats.” Anthropozoologica 42(2):9-40.

Zohary, Daniel, Maria Hopf and Ehud Weiss 2012 Domestication of Plants in the Old World: The Origin and Spread of Domesticated Plants in South-west Asia, Europe, and the Mediterranean Basin (Fourth Edition). Oxford: Oxford University Press.

Further viewing

Access Agriculture has a small collection of videos for small-scale dairy farmers.

Pure milk is good milk ; Keeping milk free from antibiotics ;  Managing cattle ticks; Taking milk to the collection center ; Keeping milk clean and fresh ;  Hand milking of dairy cows

Related blog stories on the prehistory of food

The sugar palms of Angkor Wat, The sunflower: From Russia with love, and oil

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Men’s language, women’s language January 8th, 2017 by

In most countries, men and women have different styles of speaking. But is it possible for a community to have two completely different languages, one for men and one for women, not just for one generation, but sustained for a long time?

caribbeanIf such diglossia (a dual language system) is possible, imagine the decisions one would have to make while engaging with such a community. Makers of educational videos might have to make two soundtracks for a single community. An agricultural extensionist would have to choose which language to use for a talk.

caribbean-lesser-antillesAs strange as it may seem, at least one society did come close to having two, gender-based languages, which were spoken over several generations.  In the 17th century, the people of the Caribbean Island of Dominica told a story that they said took place some generations before the coming of the Europeans, when the islands of the Lesser Antilles had been inhabited by people who spoke an Arawak language. Then the islands were attacked by canoe-loads of men who spoke a Carib language. The invaders killed the local men, and then settled down with the women.

The two languages were extremely different, but the children born after the invasion grew up speaking both of them. All children learned the Arawak language of their mothers, but when the boys became teenagers they started spending more time with the men, and began to speak Carib among themselves. The Islanders developed a version of Carib that became a language for men only.

In 1665, Father Raymond Breton, a French missionary, published a two-volume dictionary of the language then spoken on the islands of Dominica and St. Vincent. The dictionary specified whether each word was used by men, or by women.

Various scholars have questioned the historical accuracy of the Carib invasion story. It is possible that the men’s language originated through trade or migration.  We will never know if Carib men of the 13th century once rampaged across the island beaches, murdering Arawak men and capturing women. There is no historical or archaeological evidence for (or against) this story. Yet the linguistic data are well documented. There is no doubt that in the 1650s, over much of the Lesser Antilles, men and women spoke in two remarkably different codes. The two genders used the same sounds, and most of the same grammar, but men’s words were from Carib, and women’s words were from Arawak. (The men could speak the women’s language, and would speak it when socializing with women. The men’s language was only used between men).

If you could time travel to the Island of Dominica in the 17th century, and were able to speak the full range of men’s and women’s languages, a talk with the whole community would sooner or later switch to the women’s language, because it was everyone’s first tongue.

In agricultural extension today, sometimes it helps to create a space where women can easily speak up, so that their concerns can be addressed. It is easy to start to think that men and women are very different, but it is also worth remembering that in some ways we are the same, and that language can unite us.

Further reading

Allaire, Louis 1980 “On the Historicity of Carib Migrations in the Lesser Antilles.” American Antiquity 45(2):238-245.

Boucher, Philip P. 2009 Cannibal Encounters: Europeans and Island Caribs, 1492–1763. Baltimore: Johns Hopkins University Press.

Davis, Dave D. and R. Christopher Goodwin 1990 “Island Carib Origins: Evidence and Nonevidence.” American Antiquity 55(1):37-48.

Taylor, Douglas 1954 “Diachronic Note on the Carib Contribution to Island Carib.” International Journal of American Linguistics 20(1):28-33.

Taylor, Douglas R. and Berend J. Hoff 1980 “The Linguistic Repertory of the Island-Carib in the Seventeenth Century: The Men’s Language: A Carib Pidgin?”  International Journal of American Linguistics 46(4):301-312.

Further viewing

Watch a video on women in agricultural extension, here.

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Deeper nitrogen, more rice, a cooler planet December 25th, 2016 by

About 10% of greenhouse emissions are from agriculture, especially from wet rice cultivation. Rice plants need a lot of nitrogen which is often provided as urea, a chemical fertilizer which is usually broadcast by hand into the irrigation water: this is easy, but wasteful. Some 60% of the nitrogen fertilizer is lost as it is transformed into gases and enters the atmosphere. Some nitrogen is washed away by irrigation water. A practical alternative known as “urea deep placement” makes much better use of nitrogen.

usgUrea usually comes in round grains, the size of fine gravel. For deep placement, the small grains are pressed into larger, oval pellets, about the size of your thumbnail. The farmer pushes these “super granules” of urea into the soft soil, between four rice plants. This deep placement puts the urea underground, near the plants’ roots, so less nitrogen escapes into the air and water. The rice crop yields more and the farmers save money because they only need to use half as much fertilizer.

usg-bricketing-machineThe efficiency of urea deep placement was demonstrated by 1980. The practice has not been adopted more widely because of the lack of supply of the super granules, the additional labor required and the difficulty of correctly placing the super granules in the field.  But by the early 2000s, urea deep placement re-emerged in parts of Asia. The manufacture of small briquetting machines meant that the super granules could be made at the village level, and has led to a dramatic increase in their use, e.g. in Bangladesh (Giller et al. 2004).

urea-usg-granule-plantingThere are two types of innovations: some you can try alone and others need to be adopted by a network. A solitary person can plant a new crop variety, for example, but it takes many people to start using super granules.  A manufacturer has to build the briquetting machines. A second manufacturer has to buy a briquetting machine, make the super granules and sell them. Extensionists have to teach farmers how to place the super granules in the rice field. Then the farmers have to use the super granules, and make the idea their own.

It is kind of a chicken and egg problem. Farmers can’t use the super granules until someone makes them. Nobody will make them if there are no customers.

urea-granule-plantingA step in the right direction is to show farmers the value of the super granules. The IFDC (International Fertilizer Development Center) commissioned Agro-Insight to make a farmer learning video on how to use urea deep placement. The video was filmed in West Africa, but the concepts also apply to Asia or even Latin America.

Of the 80 million hectares of irrigated rice worldwide, two million are in Latin America and the Caribbean, where 800,000 smallholders make their livings growing rice: 59% of which is irrigated (i.e. appropriate for urea super granules). And the region has the most potential of any to expand irrigated rice production. Rice is a popular food; tropical Latin Americans eat an average of 37 kilos of milled rice every ear, equivalent to a generous portion of 1.3 cups of cooked rice per day. As incomes increase, Latin Americans eat (and import) more rice.

As Latin America and the Caribbean grow more rice, it will help to make better use of nitrogen. So the urea deep placement video was recently translated to Spanish (there was already a Portuguese version). The video is a start, as it can teach farmers and extensionists about the importance of using fertilizer more efficiently, so that farmers can start to demand super granules and encourage companies to make and stock them. Even without super granules, growers of any crop will harvest more and save money if they grasp the idea that urea goes further if it is buried in the soil. This innovation makes a small contribution towards solving the problem of global warming.

Further viewing

You can watch the urea deep placement video in English here, in Spanish here, and in nearly 30 other languages here.

Related blog

Take a stab

Further reading

Bent, Elizabeth 2015 The ground exhales: reducing agriculture’s greenhouse gas emissions http://theconversation.com/the-ground-exhales-reducing-agricultures-greenhouse-gas-emissions-40795

Giller, Ken E., Phil Chalk, Achim Dobermann, Larry Hammond, Patrick Heffer, Jagdish K. Ladha, Phibion Nyamudeza, Luc Maene, Henry Ssali, and John Freney 2004 “Emerging Technologies to Increase the Efficiency of Use of Fertilizer Nitrogen,” pp. 35-51. In Arvin R. Mosier, J. Keith syers and John r. Freney (Eds.) Agriculture and the Nitrogen Cycle: Assessing the Impacts of Fertilizer Use in Food Production and the Environment. Washington: Island Press.

Pulver, Eduard 2010 “Manejo Estratégico y Producción Competetiva del Arroz bajo Riego en América Latina,” pp. 350-362. In Víctor Degiovanni B., César P. Martínez R., & Francisco Motta O. Producción Eco-Eficiente del Arroz en América Latina. Volume 1. Cali, Colombia: CIAT. http://ciat-library.ciat.cgiar.org/Articulos_Ciat/2010_Degiovanni-Produccion_eco-eficiente_del_arroz.pdf

Ricepedia http://ricepedia.org

Savant, N. K. and P. J. Stangel 1990 “Deep Placement of Urea Supergranules in Transplanted Rice: Principles and Practices.” Nutrient Cycling in Agroecosystems 25(1):1-83

 

 

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