SATrends Issue 15 

February 2002

NEWS FROM THE DRY TROPICS:

1. 36 Percent -- and Rising!
2. Of Stalk and Livestock
3. Stalking the Enemy
4. Sorghum Scoop from Mali
5. Highlights of Previous Issues

 

1. 36 Pecent -- and Rising!

Tanzania produces more sorghum and millet than any other country in southern Africa. Although these ancient crops have been cultivated for millennia, cultivation methods have changed little. Tanzania adoption photo-1_web.jpg (7195 bytes)

Most farmers still use traditional landraces that give low yields and are often wiped out by drought. They can afford few inputs and rarely bother with new crop management methods. But things are changing, thanks to partnerships brokered by the ICRISAT-led Sorghum and Millet Improvement Program (SMIP). In the early 1990s, improved varieties occupied barely 5% of Tanzania’s sorghum andmillet area. Today that figure has risen to 36% for sorghum and 27% for pearl millet. (Left, evaluating the harvest).

Very rarely do adoption levels rise so much, or so quickly. The magic ingredient: partnerships. Specifically, SMIP efforts helped strengthen Tanzania’s breeding program by

  • providing improved germplasm and breeding lines,
  • sponsoring training programs for both research and extension staff,
  • helping create farmer awareness of new technologies, and
  • improving the production and delivery of seed by both the formal seed system and informal community-based initiatives.

Donors – USAID, GTZ and others – kept faith with researchers as they fought to develop technologies suited to a harsh environment with poor soils and unpredictable rainfall. Equally important, the network of partners was expanded to include NGOs and the private sector. These efforts are paying off handsomely.

In the 1980s, few improved varieties had been released in Tanzania. The most recent release was sorghum variety Tegemeo in 1986. Enter SMIP, and a stream of new products started flowing from the mid 1990s – notably sorghum varieties Pato and Macia, and pearl millet varieties Okoa and Shibe.

Despite plenty of anecdotal evidence of rapidly growing adoption, however, little hard data was to be found. A formal survey was therefore conducted to assess adoption levels. It covered the most important districts in the country. The data show that improved varieties currently occupy about 36% of Tanzania’s sorghum area and 27% of pearl millet area.

Higher adoption means higher productivity, higher incomes, and more food on the table for farm families. But many challenges remain. For example, why do adoption levels differ across the country, and what can be done about it? And how can we ensure that new technologies, and the extension staff to promote them, reach farmers in remote areas, where the problems are most severe?

For more information, contact g.heinrich@cgiar.org

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2. Of Stalk and Livestock

 

In the movie City of Angels, a man proposing to a woman says, “Lets get married – we’re the same species.”

While it is unthinkable that the parties involved in a marriage are not of the same species, there are no such restrictions for collaborations. The International Livestock Research Institute (ILRI) and ICRISAT do not have an obvious field of common interest. But ruminant livestock, which contribute to human welfare by providing food, draft power and manure, consume crop residue as fodder. This is the common ground for collaborative research.

feeding cow.jpg (16254 bytes)A multidisciplinary research team of scientists funded by the Indian Council of Agricultural Research (ICAR), the UK’s Department for International Development (DFID), the Australian Center for International Agricultural Research (ACIAR) and ILRI, set out to identify genotypes of sorghum and pearl millet that could be used to develop plants with greater biomass and nutritive value without sacrificing grain yield. Though the funding for this project will end in 2002, the task is far from over, and efforts are on to obtain fresh funding from DFID and ACIAR, as well as from BMZ in Germany. A new joint proposal was recently invited by BMZ aimed at enhancing the livelihood of smallholder crop livestock farmers through improved dual purpose food feed crops and better natural resource use in areas of high rural poverty. (Right, farmer feeding the bullock with sorghum stover).

How do the scientists propose to investigate?  Plant Breeders generate thousands of entries every year to identify the best dual-purpose varieties. Animal nutritionists need to predict stover quality from these samples quickly and accurately through appropriate laboratory techniques. However, these techniques need to be validated through animal performance trials. Experiments with sheep devised by an ILRI scientist at ICRISAT-Patancheru meticulously measure all input and output of the animals. The ultimate aim is to identify stover that will promote a high level of animal performance and efficiently convert carbon and nitrogen into useful products such as milk and meat.

For more information contact b.reddy@cgiar.org, or c.t.hash@cgiar.org, or s.pande@cgiar.org, or m.blummel@cgiar.org

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3. Stalking the Enemy

Pursuing an enemy you can see is difficult enough, but when the enemy operates underground, catching hold of him becomes almost hopeless.

 

Peanut clump virus (PCV) is a nasty adversary of African peanut (groundnut) farmers. Pitting their wits against this wily disease, researchers use cutting-edge tools to track it down and destroy it.

 

PCV causes losses valued at over $40 million worldwide every year. Adding insult to injury, the disease uses various guises. In Africa it is known simply as PCV, while in Indian subcontinent the scourge is called Indian peanut clump virus (IPCV).

 

Although it prefers attacking groundnut, PCV infects a whole range of cereals and legumes, including maize, sugarcane, wheat, barley, sorghum, millet and cowpea.

The main symptoms of PCV attack on groundnut are severe stunting of infected plants, chlorotic lesions on younger leaves, and dark green older leaves.

PeanutClump_web.jpg (8188 bytes)Philippe Delfosse (left, in a groundnut field) is an ICRISAT virologist based in Niger. Delfosse, who has carried the fight to PCV since his days as a PhD scholar, says PCV is soil-borne and is vectored by the fungus Polymyxa graminis. This parasite survives for many years in the soil in the form of highly resistant resting spores.”

Delfosse is closely involved with a special collaborative project between ICRISAT and the Université Catholique de Louvain in his native Belgium, with support from the Belgian government. The aim of the project is to better understand the complex epidemiology of the peanut clump disease in West Africa and to develop simple cultural practices to control it.

To do this, the project scientists first tried to determine the biodiversity of PCV and Polymyxa isolates using diagnostic tools. They found that in groundnut PCV is transmitted through seeds. “To prevent further spread of PCV in West Africa, extreme caution is essential in selecting the seed,” Dr Delfosse commented.

Because no resistance to PCV has yet been identified in cultivated groundnut, scientists are evaluating wild Arachis species for sources of resistance to the virus. Meanwhile, the most feasible method of managing the disease currently available is through such cultural practices as trap cropping with millet and judicious time of sowing. These methods have significantly reduced clump disease incidence in India.  

Future plans for the project include:

 

·         Production of diagnostic tools for detecting PCV

·         Development of effective cultural practices

·         Development of a prediction model

·         Training

·         Publication of an information bulletin

 

For more information contact p.delfosse@cgiar.org

 

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4. Sorghum Scoop from Mali

 

After the lows come the highs. What’s true in nature is true for research. After a lull of 15 long years, the sorghum scene in Mali has suddenly gone into high gear.

Eight sorghum varieties were recently released by the country and included in its variety catalog. This is the first release of varieties developed jointly by national programs, CIRAD and ICRISAT after a long time.

What triggered off this sudden success? Well, first of all it wasn’t sudden. Eva Weltzien, a senior ICRISAT sorghum breeder based in Mali, explains that the release is a result of intensive participatory research with farmers conducted over the past 3 years.

Eva Sorghum 2_web.jpg (8258 bytes) Explaining the breeding strategy that led to this success, she says, “Farmers have detailed knowledge of varietal characteristics and strategies for managing sorghum genetic diversity. We therefore involved farmers in different regions in the evaluation of new varieties.”

Extension services and several nongovernmental organizations contributed to this joint effort led by the Institut d’economie rurale (IER), Mali’s national research program, and ICRISAT. (Right, discussion between scientists, extenstion workers and farmers).

“These eight varieties were found to be widely acceptable, after having been extensively tested by farmers in different parts of the country,” explains Weltzien. In discussions with participating farmers, she found that they used over 65 traits to evaluate sorghum varieties, the most important of which are maturity period, high grain yield, panicle size and shape, grain quality to ensure long storage, and culinary aspects.

Farmers in cotton-growing areas were keen to find sorghum varieties that respond to increased fertility. “This capacity to fully exploit the available soil fertility and water resources is strongly linked to a maturity period that covers the full growing season,” says Weltzien.

One specific trait of the local guinea-type sorghum is photoperiod sensitivity. This enables full-season crop growth to correspond to the end of the rains, despite highly variable sowing dates. Researchers are trying to improve sorghum’s yield while maintaining its adaptive and quality characteristics.

Of the eight varieties released, four are selections from guinea landrace accessions (CSM 335, CS 485, CSM 660, Nazongola anthocyan), and one from a guinea-caudatum landrace (IS 15401). Of the three newly bred varieties, one belongs to the guinea race (CGM 19/9-1-1), one is a guinea-caudatum intermediate (CIRAD 406), and the last belongs to the caudatum race (ICSV 1079).

Summarizes Weltzien, “These eight releases represent a significant addition to farmers’ portfolio of available varieties – and we hope this is only a beginning.”

For more information contact e.weltzien@cgiar.org

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