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Encouraging microorganisms that improve the soil February 16th, 2020 by

Vea la versi√≥n en espa√Īol a continuaci√≥n

We have written earlier in this blog about ‚ÄúEffective Microorganisms¬ģ‚ÄĚ or EM, a branded, commercial preparation. In both of those previous stories, people were using EMs in pig pens, to reduce the odor and to quickly turn the manure to a rich, black compost. 

This week I learned how you can culture your own microorganisms, using some simple equipment and a few inexpensive ingredients. Ing. Abrah√°n Mujica showed me and a small group at his agroecology course that you can start by collecting some leaf litter. We gathered the leaves and top soil from the base of two or three molle trees in the city of Cochabamba.

We put some 5 kilos of leaf litter and black soil on a plastic table. We added a kilo of raw sugar and a kilo of bran (rich in proteins), to feed the microorganisms, and just enough water to turn the mix to a paste. It should be just moist enough that it will release a couple of drops when you press it in your hand

As we mixed up the ingredients, a smell like bread yeast soon filled the room.

‚ÄúSmell the yeast!‚ÄĚ Abrah√°n said. ‚ÄúThe yeast are the first microorganisms to respond to the sugar.‚ÄĚ

‚ÄúNot just yeast,‚ÄĚ I said. ‚ÄúThere must be 10,000 species of microbes in there.‚ÄĚ Abrah√°n happily agreed.

We filled a third of a 20-liter bucket with this paste, and covered it with plastic bags, tied on with a rubber tie, to keep out the air. The mix will rot if it is exposed to the air, Abrah√°n stressed. Fermentation is without oxygen.

After a month, Abrah√°n will mix the fermented paste with water in a 200-liter barrel, seal it again for another month, and then drain off the water, which by then will be full of microorganisms.

He filters this solution through an ordinary cloth and bottles the liquid for sale. The label reads ‚ÄúThe Life of the Soil‚ÄĚ. It can be sprayed on the soil to make it healthier, or added to compost to speed up decomposition, or used as fertilizer on plant leaves. He said it is intended mainly for soil that has been killed by pesticides, to bring the soil back to life.

Abrah√°n‚Äôs home also doubles as a small shop, where he sells √°cido pirole√Īoso (liquid smoke distilled during charcoal making‚ÄĒwhich is mixed with water and sprayed onto crops as natural insect and fungus control). He also makes potassium soap (which he makes by mixing potassium sulfate with cooking oil), sulfur-lime blend, Bordeaux mix, and other products for protecting plants without toxic chemicals.

Although Abrahán makes the products he sells, he is happy to teach others. On his agroecology course, he teaches others his trade secrets about how to make each product. There will always be lots of people who don’t want to mix these brews. And those who do make their own will also help to make the world a better place, by reducing the use of toxic pesticides, which Abrahán explains are a danger to farmers and consumers.

Related blog stories

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Effective micro-organisms

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FOMENTANDO MICROORGANISMOS QUE MEJORAN EL SUELO

Por Jeff Bentley

16 de febrero del 2020

Hemos escrito antes en este blog sobre “Microorganismos Efectivos¬ģ” o EM, una marca comercial. Los dos blogs anteriores explican el uso de EMs en camas de cerdos para reducir el olor y ayudar a la descomposici√≥n del esti√©rcol. 

Esta semana aprend√≠ c√≥mo uno puede multiplicar sus propios microorganismos, usando un equipo simple y unos pocos ingredientes baratos. El Ing. Abrah√°n Mujica me mostr√≥ a m√≠ y a un peque√Īo grupo en su curso de agroecolog√≠a. Recogimos tierra vegetal o sach‚Äôa wanu, como decimos en Bolivia, del pie de un molle, en plena ciudad.

En una mesa de pl√°stico, pusimos como 5 kilos de sach‚Äôa wanu. A√Īadimos un kilo de chancaca (az√ļcar moreno) y un kilo de salvado (cascarilla de cereal rica en prote√≠nas), para alimentar a los microorganismos, y s√≥lo el agua suficiente para convertir la mezcla en una pasta, que al apretarla, debe soltar un par de gotas.

Mientras mezclábamos los ingredientes, un olor a levadura de pan llenó el ambiente.

“¬°Sientan la levadura!” Abrah√°n dijo. “La levadura es el primer microorganismo que responde al az√ļcar y nutrientes”.

“No s√≥lo la levadura”, dije. “Debe haber 10.000 especies de microbios ah√≠”. Abrah√°n estuvo plenamente de acuerdo.

Llenamos un tercio de un tacho de plástico de 20 litros con esta pasta y lo tapamos con hojas de plástico, atadas con una liga de goma, para evitar que entre el aire. La mezcla se pudrirá si se expone al aire. Abrahán recalcó que la fermentación es sin oxígeno.

Después de un mes, Abrahán la mezclará con agua en un turril de 200 litros; lo sellará de nuevo por otro mes, y luego drenará el agua, que para entonces estará llena de microorganismos.

√Čl filtra esta soluci√≥n a trav√©s de un pa√Īo ordinario y embotella el l√≠quido para su venta. La etiqueta dice “La vida del suelo”. Puede ser fumigado en el suelo para devolverle vitalidad, o puesto en la abonera para acelerar la descomposici√≥n, o aplicado a las plantas como abono filiar. Dijo que est√° destinado principalmente a los suelos que se han muerto por los plaguicidas, para devolverles la vida.

La casa de Abrah√°n tambi√©n funciona como una peque√Īa tienda, donde vende √°cido pirole√Īoso (humo l√≠quido destilado durante la fabricaci√≥n de carb√≥n vegetal, que se mezcla con agua y se fumiga sobre los cultivos para controlar los insectos y los hongos de forma natural). Tambi√©n hace jab√≥n pot√°sico (que elabora mezclando sulfato de potasio con aceite de cocina), caldo sulfoc√°lcico, caldo bordel√©s y otros productos para proteger las plantas sin productos qu√≠micos t√≥xicos.

Aunque Abrah√°n fabrica los productos que vende, le gusta ense√Īar a los dem√°s. En su curso de agroecolog√≠a, ense√Īa a otros sus secretos sobre c√≥mo hacer cada producto. Siempre tendr√° mercado, porque habr√° mucha gente que no quiere hacer estas mezclas. Y aquellos que hacen la suya tambi√©n ayudar√°n a hacer del mundo un lugar mejor, reduciendo el uso de agroqu√≠micos mucho m√°s t√≥xicos, que Abrah√°n est√° convencido son un peligro para los agricultores y consumidores.  

Previamente en nuestro blog

La agricultura con √°rboles

Effective micro-organisms

Smelling is believing

Videos relacionados

Buenos microbios para plantas y suelo

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Spineless cactus February 2nd, 2020 by

I wrote in last week’s blog, Her mother’s laugh, that famed plant breeder (and showman), Luther Burbank, bred the spineless cactus. But there is more to the story.

The prickly pear cactus is native to Mexico and spread to the Caribbean and possibly to the Andes in pre-Colombian times. Columbus took the plant, with its delicious fruit, back to Europe on his first voyage. The hardy cactus was soon grown around the Mediterranean, and quickly found its way to arid lands from South Africa to India.

While ancient Mexicans domesticated this cactus, farmers in India selected varieties without thorns.

By 1907, Luther Burbank was promoting his spineless cactus, a hybrid of Mexican and Indian varieties. In his catalogues he wrote that the cactus which would grow with no irrigation, little care, and it would make ideal cattle fodder for the arid western USA.

In the USA, Burbank’s spineless cactus never quite lived up to its hype. While it lacked the large, needle-like thorns, it still grew small, hair-like thorns, which are brittle and can be painful when they lodge into a person’s hands or an animal’s mouth. Burbank’s spineless cactus required some irrigation and more management than other varieties, and under stress, the cactus tended to grow its spines. The thorn-free cactus also had to be fenced to protect it from hungry livestock and wildlife.

Burbank’s American cactus bubble burst by the 1920s, when ranchers grew disappointed with prickly pear. But there was already a long tradition of growing spineless cactus in India, where smallholder farmers had perfected the art of growing the prickly pear for fruit, and to feed the leaves to their livestock. Now you can learn from them, in a new video that tells how to plant, and grow the cactus, and use it as animal fodder.

Watch the video

Spineless cactus for fodder

Related blog stories

Her mother’s laugh

Kiss of death in the cactus garden

Learn by eating

Read more

Ewbank, Anne 2019 The Thorny Tale of America’s Favorite Botanist and His Spineless Cacti https://www.atlasobscura.com/articles/spineless-cactus

Griffith, M. P. 2004 The origins of an important cactus crop, Opuntia ficus‚Äźindica (Cactaceae): new molecular evidence. American Journal of Botany91(11), 1915-1921.

Her mother’s laugh January 26th, 2020 by

In She Has Her Mother’s Laugh, Carl Zimmer, professor of science writing at Yale University, takes us on an enlightening and ambitious tour de force of genes and the history of their science. Zimmer loves a story, and he treats his readers to many along the way: for example, how the American plant breeder Luther Burbank, who had only a faint idea of genetics, but a keen eye for plants, bred everything from the Burbank potato to spineless cactus.

Zimmer‚Äôs stories weave in many ideas, but I want to focus on just two. First, many genetic traits are not governed by simple Mendelian genetics. Mendel, the ‚Äėfather‚Äô of genetics, got lucky in his breeding experiments with peas, where easily observable traits like flower color and wrinkled seed coat are conveniently governed by single genes.

But there is no single gene for much of what we admire most. Tall people do have tall children, but there is no one gene for height. There are several thousand genes, each of which may add a hair’s breadth to your stature. Likewise, there is no smart gene, yet 84% of our 20,000 genes have some influence on our brain.

In agriculture we are seeing the same thing. For example, crop yield is shaped by a wide range of genes and there may not be any one gene that helps plants resist a specific disease.

A second of Zimmer’s lessons: nearly all genes are influenced by their environment. Healthy kids who eat nutritious food grow up to be taller than sick, hungry children.

In Europe, 30,000 years ago, hunter gatherer men were around 6 feet tall (183 cm). But early agriculture was not able to provide the protein and dietary diversity made possible by hunting and gathering. The first farmers were shorter than their ancestors, and from the dawn of agriculture until the 1700s the average European man stood at 5 feet 5 inches (165 cm). The move from agriculture into the industrial era was even more disastrous. At the end of the 18th century in England, 16-year-old boys from wealthy families were 9 inches (23 cm) taller than lads from poor homes. It wasn’t until the end of the 19th century that sewage systems had improved public sanitation (and people’s health) and the railroads began bringing fresh food long distances to cities. As urban people began to eat better, they got taller. Today many human populations are once again as tall as their ancestors were, 30,000 years ago.

So, there is no tall gene, yet good health and nutrition can help kids grow up to be as tall as their genes will allow. What is true for people is also true for plants and agriculture. Healthy soils, rich in organic matter, and well-managed water and a rich biodiversity of crops and wild plants and animals will help farmers to make the most of the genetic heritage of their plants and livestock.

Further reading

Zimmer, Carl 2018 She Has Her Mother’s Laugh: The Powers, Perversions and Potential of Heredity. New York: Dutton. 656 pp.

Related blog story

Read more about Luther Burbank and spineless cactus: Spineless cactus

Farming with trees January 19th, 2020 by

Vea la versi√≥n en espa√Īol a continuaci√≥n.

On a rocky hillside an hour from the city of Cochabamba, agronomist Germán Vargas points out a molle tree. It’s growing from a crack in a sandstone boulder with little or no soil. Native trees are well adapted to such conditions and don’t need much to survive, Germán observes.

Molle can be cut for good firewood, but it also casts an inviting shade, with a thick carpet of fallen leaves. Trees grown on farms also have multiple uses. Some have deep roots that bring up nutrients from beneath the top soil. Even in places like Cochabamba, with a long dry season, many trees stay green all year round. The trees have found water to keep their leaves moist, despite the bone-dry subsoil. Germ√°n explains that farming with trees, or agroforestry, mimics natural forests, where rich soils are created without irrigation or fertilizer.

Four years ago, Germ√°n and two colleagues bought some land to put their ideas on agroforestry into practice. They now have 1500 apple trees in a 4-hectare orchard, on a former onion farm, where the intensive use of chemical fertilizers and pesticides had depleted the soil of nutrients.

Germ√°n and his friends bought some apple seedlings from a local nursery. They chose improved Brazilian apple varieties, such as Eva and Princesa, which do well in the highland tropics of South America, where it can get cool, but does not freeze.

Germ√°n and his colleagues plant a few more trees every year. They start each new planting by digging a trench every two to three meters (depending on the slope), to let water infiltrate the soil. They throw the soil just uphill of the trench to create a barrier, slowing down the runoff of water and trapping sediment.

Germ√°n is careful not to scrape the soil surface with hand tools; the top soil is so thin that rough handling could remove it all. They add a little compost to the soil, mimicking a natural forest, where fallen leaves and trees rot and release nutrients back into the soil. However, forests also have an understory, so potatoes, maize, lettuce, amaranth, rye and other plants are sown between the trees. After planting the vegetables, a straw mulch keeps down the weeds.

Other trees are planted among the apples, including natives like molle and exotic species, which are monitored to see if they can make a positive contribution. Germ√°n brought seed of the chachafruto tree from Colombia, for example. The plant is adapting well. When the only date palm in Cochabamba, another non-native species, dropped a cluster of dates in a city park, Germ√°n salvaged the seed and planted some on the farm. The non-fruit trees make useful leaf litter, adding nutrients and helping to keep the soil moist.

The apples were remarkably free of mildew, mites, fruit flies and other common pests, but even if they were to appear, Germ√°n avoids using pesticides. The team managing the orchard makes a spray with cow manure, raw sugar, bone meal, sulfur, ash and lime. Reasoning that all stone has mineral nutrients, they add a little ‚Äúrock flour,‚ÄĚ made by grinding a soft, local, sedimentary stone (shale). A culture of beneficial microorganisms is added to ferment the mix in sealed drums. The agroforesters culture the microorganisms themselves, but they get the starting culture in the local forest, bringing in a few handfuls of fallen leaves that have started to decompose. The sulfur and the lime come from the farm supply store. This sulfur blend is sprayed about 5 times a year on the trees, and it seems to be working, since the apples have almost no pests, except for birds, and the annual plants are thriving.

This innovative agroforestry system needs regular attention and it is obviously a lot of work, especially at first, because it is established by hand, without machinery. Some of the radishes have gone to seed, and in a few beds the weeds are lush and healthy, waiting to be cut down for the next vegetable crop.

Farmers can learn from forests to make better use of water, conserve the soil and manage pest and disease naturally, thanks to the diversity of plants. Farming with trees can yield a good harvest of fruits and vegetables, while building and sustaining soils.

Related blog stories

Apple futures

What counts in agroecology

Gardening against all odds

Enlightened agroecology

Watch some related videos

SLM02 Fanya juu terraces shows how to make infiltration trenches, that form terraces.

SLM03 Grevillea agroforestry

SLM08 Parkland agroforestry

Scientific names

The molle tree is Schinus molle

The chachafruto tree (widespread in South America) is Erythrina edulis

Note

Sulfur deficiency is a problem in apples. The symptoms are similar to nitrogen deficiency, including pale leaves. Sulfur deficiency can be corrected by sprays (Westwood 1993: 200-201).

Westwood, Melvin Neil 1993 Temperate-Zone Pomology: Physiology and Culture. Third edition. Portland, Oregon: Timber Press.

Acknowledgements

Thanks to Germán Vargas, Marcelina Alarcón and Freddy Vargas, the agroforesters. Germán is the executive administrator of the NGO Agroecología y Fe.

LA AGRICULTURA CON √ĀRBOLES

En una ladera rocosa a una hora de la ciudad de Cochabamba, el ingeniero agr√≥nomo Germ√°n Vargas se√Īala un molle. Crece en una grieta de una roca arenisca, con poca o ninguna tierra. Los √°rboles nativos est√°n bien adaptados a estas condiciones y no necesitan mucho para sobrevivir, observa Germ√°n.

El molle hace buena le√Īa, pero tambi√©n da una rica sombra, con una gruesa alfombra de hojas ca√≠das. Los √°rboles en el agro tambi√©n tienen m√ļltiples usos. Algunos tienen ra√≠ces profundas que traen los nutrientes de debajo del suelo. Incluso en lugares como Cochabamba, con una larga √©poca seca, muchos √°rboles se mantienen verdes durante todo el a√Īo. Los √°rboles han encontrado agua para mantener sus hojas h√ļmedas, a pesar del subsuelo seco. Germ√°n explica que la agricultura con √°rboles, o la agroforester√≠a, imita a los bosques naturales, donde se crean suelos ricos sin irrigaci√≥n ni fertilizantes.

Hace cuatro a√Īos, Germ√°n y dos colegas compraron un terreno para poner en pr√°ctica sus ideas sobre agroforester√≠a. Ahora tienen 1500 manzanos en un huerto de 4 hect√°reas, en una antigua granja de cebollas, donde el uso intensivo de fertilizantes qu√≠micos y pesticidas hab√≠a agotado los nutrientes del suelo.

Germ√°n y sus compa√Īeros compraron algunos plantines de manzana en un vivero local. Escogieron variedades mejoradas de manzanos brasile√Īos, como Eva y Princesa, que se desarrollan bien en los tr√≥picos de las alturas de Am√©rica del Sur, donde puede hacer fr√≠o, pero no se congela.

Germ√°n y sus colegas plantan unos pocos √°rboles m√°s cada a√Īo. Comienzan cada nueva plantaci√≥n cavando una zanja cada dos o tres metros (dependiendo de la pendiente), para dejar que el agua se infiltre en el suelo. Lanzan la tierra justo cuesta arriba de la zanja para crear una barrera, frenando el escurrimiento de agua y atrapando el sedimento.

Germ√°n tiene cuidado de no raspar la superficie del suelo con herramientas; el suelo negro de la superficie es tan delgado que sin tener cuidado ser√≠a posible quitarlo todo. A√Īaden un poco de abono al suelo, imitando un bosque natural, donde las hojas y los √°rboles ca√≠dos se pudren y liberan nutrientes de nuevo al suelo. Sin embargo, los bosques tambi√©n tienen un sotobosque, por lo que las papas, el ma√≠z, la lechuga, el amaranto, el centeno y otras plantas se siembran entre los √°rboles. Despu√©s de plantar las verduras, un mantillo de paja mantiene las malas hierbas.

Entre las manzanas se plantan otros √°rboles, incluyendo especies nativas como el molle y especies ex√≥ticas, que son monitoreadas para ver si pueden hacer una contribuci√≥n positiva. Germ√°n trajo semillas del √°rbol de chachafruto de Colombia, por ejemplo. La planta se est√° adaptando bien. Cuando la √ļnica palmera datilera de Cochabamba, otra especie no nativa, dej√≥ caer un racimo de d√°tiles en un parque de la ciudad, Germ√°n recuper√≥ algunas semillas y las plant√≥ en la finca. Los √°rboles no frutales botan hojas, a√Īadiendo nutrientes y ayudando a mantener el suelo h√ļmedo.

Las manzanas estaban notablemente libres de mildiu, √°caros, moscas de la fruta y otras plagas comunes, pero incluso si aparecieran, Germ√°n evita el uso de pesticidas. El equipo que maneja el huerto fumiga con un biol hecho de esti√©rcol de vaca, chancaca, huesos molidos, azufre, cenizas y cal. Razonando que toda piedra tiene nutrientes minerales, le agregan un poco de “harina de roca”, hecha al moler una piedra sedimentaria suave, local (lutita). Para fermentar la mezcla, agregan un cultivo de microorganismos buenos a los tambores sellados. Los agroforestales cultivan sus propios microorganismos, pero obtienen la cultura inicial en el bosque local, trayendo unos pocos pu√Īados de hojas ca√≠das que han comenzado a descomponerse. Compran el azufre y la cal en la tienda agropecuaria. Fumigan el biol con azufre unas 5 veces al a√Īo en los √°rboles, y parece que funciona, ya que las manzanas casi no tienen plagas, excepto los p√°jaros, y las plantas anuales est√°n prosperando.

Este innovador sistema agroforestal necesita atención regular y obviamente es mucho trabajo, especialmente al principio, porque se establece a mano, sin maquinaria. Algunos de los rábanos han empezado a echar semilla, y en algunas camas las hierbas silvestres son exuberantes y saludables, esperando ser cortadas para el siguiente cultivo de hortalizas.

Los agricultores pueden aprender de los bosques a hacer un mejor uso del agua, conservar el suelo y manejar las plagas y enfermedades de forma natural, gracias a la diversidad de plantas. La agricultura con √°rboles puede producir una buena cosecha de frutas y verduras, a la vez que construye y mantiene los suelos.

Otros blogs sobre el tema

Manzanos del futuro

Lo que cuenta en la agroecología

Un mejor futuro con jardines

La luz de la agroecología

Videos relacionados

SLM02 Terrazas fanya juu muestra cómo hacer zanjas de infiltración, que forman terrazas.

SLM03 Agroforestería con grevillea

SLM08 Agroforestería del bosque ralo

Nombres científicos

El molle es Schinus molle

El chachafruto (árbol bien distribuido en Sudamérica) es Erythrina edulis

Nota

La deficiencia de azufre es un problema com√ļn en los manzanos. Los s√≠ntomas son parecidos a los de la deficiencia de nitr√≥geno, incluso las hojas p√°lidas. La deficiencia de azufre puede ser corregida con fumigaciones (Westwood 1993: 200-201).

Westwood, Melvin Neil 1993 Temperate-Zone Pomology: Physiology and Culture. Third edition. Portland, Oregon: Timber Press.

Agradecimientos

Gracias a Germán Vargas, Marcelina Alarcón y Freddy Vargas, por su ejemplo con la agroforestería. Germán es el administrador ejecutivo de la ONG Agroecología y Fe.

Wicked seed January 5th, 2020 by

A recent story in The Economist (28 September 2019, page 18) highlights the low maize yields in Africa, and urges for greater use of hybrid maize seed. The Economist also has harsh words for NGOs: ‚ÄúAfrican governments have mostly ignored the arguments from some charities, that old-fashioned farming is best and that wicked, profit-seeking seed firms should be barred.‚ÄĚ

This caricature is misleading in two ways: many NGOs promote modern seed; and seed companies have more serious enemies than any ‚Äúcharity‚ÄĚ.

Cassava is a big staple food in Africa, like maize. Unlike maize, which is planted using true seed, cassava is propagated with stem cuttings. Seed companies rarely sell stems or other vegetative planting material, even for major crops, other than potato. This is mainly for practical reasons; cuttings, vines and roots are bulky, and perishable. Farmers usually trade for cassava stems, get them from friends for free, or buy them from producers or traders.

Donor-funded projects, such as UPOCA and the Great Lakes Cassava Initiative, have also played an important part in making cassava planting material available, worked closely with NGOs to distribute the stems of new, disease-resistant varieties of cassava to farmers in various African countries. This progressive and modern system is neither old-fashioned nor wicked.

It‚Äôs not just cassava where such initiatives have helped make planting material available.  In Kenya, public research, like the 3G Seed Strategy, supported the production of high-quality seed potatoes (not true seed, but the small tubers that farmers plant). The project purposefully channeled the production and sale of the little seed potatoes through private companies and commercial farms, to promote sustainable business.

The real enemies of private seed companies include crooks who sell fake seed. To its credit, The Economist did mention counterfeit seed as a problem, but it is worse than the newspaper let on. In a visit to Premier Seed, a Nigerian company, I was impressed by their expertise and competence. They had a professional plant breeder, a tidy lab growing maize seedlings in rows of dishes, and an orderly warehouse stacked with bags of seed. I never heard Premier or other Nigerian seed enterprises complain about NGOs or ‚Äúcharities‚ÄĚ.  The real problem was counterfeit seed. Criminals would buy cheap maize grain in the market, dye it to make it look like treated seed, and package it in bags printed to look like those of a real company. Farmers only realized they‚Äôd been sold a dud at harvest time. Counterfeit seed smeared the good name of the legitimate companies, whose packaging had been copied.

Life is difficult for seed companies trying to survive, especially the smaller ones. Even when the Nigerian government buys large amounts of seed from private companies to distribute to smallholders, as it does from time to time, there’s a twist. The government can be slow to pay its bills, with the result that a small company’s capital cash flow is blocked and capital is tied up for a year or more. Bigger firms with deeper pockets can more easily wait to be paid.

Few NGOs argue that old-fashioned farming is best. Most promote a sensible blend of tradition and innovation in agricultural practices and respect the pioneering.

There is a reason why seed companies may be seen as wicked. As Paul and colleagues recently explained in two videos (one from Guatemala and one from Malawi), some seed laws threaten farmers’ right to use their own seed.

African seed enterprises do have real problems, but ‚Äúcharities‚ÄĚ are not among them. Governments should help national seed companies by arresting the fake seed sellers, and paying for seed on time. Farmers have a right to keep their own seed, but they need modern seed as well. NGOs and research centers often work together to provide such seed, especially for crops that private companies ignore.  

Further reading

For Nigerian seed enterprises see:

Bentley, Jeffery W., Olupomi Ajayi and Kehinde Adelugba 2011 ‚ÄúNigeria: Clustered Seed Companies,‚ÄĚ pp. 38-64. In, P. Van Mele, J.W. Bentley & R. Gu√©i (eds.) African Seed Enterprises: Sowing the Seeds of Food Security. Wallingford, UK: CABI. 236 pp.

For projects in Africa that have promoted modern seed of cassava, potatoes (and other crops) see:

Andrade-Piedra, Jorge, Jeffery W. Bentley, Conny Almekinders, Kim Jacobsen, Stephen Walsh, and Graham Thiele (eds.) 2016. Case Studies of Roots, Tubers and Bananas Seed Systems. CGIAR Research Program on Roots, Tubers and Bananas (RTB), Lima: RTB Working Paper No. 2016-3. ISSN 2309-6586. 244 p.

Watch the videos

Farmers’ rights to seed – Guatemala

Farmers’ rights to seed – Malawi

And this one on the benefits of good, commercial cassava stems

Quality cassava planting material

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