Brachiaria ruziziensis

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Brachiaria ruziziensis
Scientific classification
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B. ruziziensis
Binomial name
Brachiaria ruziziensis

Brachiaria ruziziensis or Congo grass is a forage crop that is grown throughout the humid tropics. With fast growth at the beginning of the wet season due to strong seedling vigour, ease of establishment, good seed production and yield and the ability to suppress weeds it has the ability to become developed into the most important forage crop planted in the tropics. [1] With the aid of genomic tools to research the genotype and gain more information there is the ability to increase breeding programs which are currently rather limited. [2]

Contents

Description

Brachiaria ruziziensis belongs to the family Poaceae, subfamily Panicoideae and the tribe Paniceae. A tufted grass, Congo grass is a creeping perennial that has short rhizomes which form a dense leafy cover over the ground. Stems of the plant arise from many-noded creeping shoots and short rhizomes and then when fully grown reach a height of 1.5 m when flowering. The leaves of this grass are soft but hairy, with an average width of 15mm, length of 25mm and a seed weight of 250,000/kg. [1] The seeds should be drilled into a well prepared seed bed, sowing in rows that are spaced 60 cm apart and it can be grazed upon as soon as it is ready. [1]

History, geography and ethnography

Brachiaria ruziziensis has numerous common names that it is known by throughout the world which include, in different languages: [3]

Its scientific name is derived from the Ruzizi, a river in East Africa.

Native to Burundi, Rwanda and Eastern DR Congo, from which it derives its common name, this forage crop has now been naturalised throughout the humid tropics. Four Brachiaria species now cover as much as 85% of the cultivated pastures of Brazil. [2]

Growing conditions

Congo grass can be established from seed which is inexpensive although it needs to be stored for six months after harvest. Alternatively the grass can be established vegetatively from stem cuttings with root nodes. It requires light soils with moderately to high fertility though it does not tolerate strongly acidic conditions and performs best in a well-drained soil. It requires a reasonably high rainfall, though it can endure dry spells, with 1000 mm or more being preferable. It requires a well prepared seed bed but light disc harrowing gives good results. Although it responds well to light, with light intensity increasing yields, it can also be planted for grazing under coconut plantations. Optimum growth occurs at 33/28 °C day/night with a minimum temperature of 19 °C. [4]

Stress tolerance

Congo grass does have certain stress tolerances that are disadvantages to poor farmers and breeding these out in the future would add significant value to this crop. It demands a relatively high fertility soil for good growth as well as adequate fertiliser use if there is persistent grazing or cutting of the crop. Heavy frosts will kill this crop and a light frost will make future regrowth very slow. Congo grass flourishes well in a well drain soil and has a poor tolerance to floods and heavy rains. [1]

Major weeds, pests and diseases

Although it is able to form a dense ground cover to compete with weeds, Congo Grass is susceptible to certain pests and diseases. It is severely attacked by the spittlebug who cause significant damage to the plant in Tropical America affecting the development and persistence of the plants. [5] As well the plant seeds are known to be affected by the fungus Sphacelia in the Congo. [1]

Genetic stocks

Currently the only cultivar is the Kennedy Ruzi which can be found in both Thailand and Australia. It performs well on the wet tropical coast and has a high seed yield. [1] Very little breeding has occurred current, but research into microsatellite markers could lead to further developments in genetic stocks and diversification of the crop. [2]

Uses and consumption

Congo Grass can be used as both a permanent or semi-permanent grass for pastures. It can be used to graze animals on or for cutting for green feed and conservation. This forage crop is found across much of the humid tropics through South America, Africa and Southeast Asia. Congo grass is a valuable forage for ruminants. [4]

Nutritional information

With large proportions of the tropics grazing their cattle, a forage crop like this that proves better than most other Brachiaria species could have significant advantages to poor farmers. It is a very palatable crop with as well as having an overall digestibility of 55–75%. For ruzi grass hay that was cut 45 days after seeding in northeast Thailand, the in vitro dry matter digestibility, crude fibre, and neutral detergent fibre were 61%, 80.5%, and 72.8% respectively. [1] Nutrient values include 0.43g/100g Calcium, 0.22g/100g Phosphorus, 2.4g/100g Potassium, 0.1g/100g Sodium, 0.28g/100g Magnesium. [5]

Economics

Congo grass has an important role as a forage crop and significant value can be added by increases crop yields and working on breeding out certain susceptibilities to pests.

Constraints to wider adoption

General knowledge is keeping this forage crop from wider and better usage around the world. Due to the almost complete lack of information that currently exists regarding Congo grass and its genome, there is little to support breeding programs for the crop. But because Congo grass is similar to other model cereals, in the fact that it has a relatively small genome, it enables genome analysis initiatives to support future breeding. There is potential here to diversify pasture and develop new cultivars of the species. Recent research has shown developed markers that are readily suitable for analysis and there is a promising future for research into this crop. [2]

Practical information

Pairing Brachiaria ruziziensis with legumes can significantly affect the production levels of the crop. Studies have shown that plots planted with legumes showed a boost in total dry matter production of 524%. Not only does it increase production but the nitrogen fixing capacities of legumes offers a much cheaper alternative to expensive fertilizers. [1]

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<span class="mw-page-title-main">Legume</span> Plant in the family Fabaceae

A legume is a plant in the family Fabaceae, or the fruit or seed of such a plant. When used as a dry grain, the seed is also called a pulse. Legumes are grown agriculturally, primarily for human consumption, for livestock forage and silage, and as soil-enhancing green manure. Well-known legumes include beans, soybeans, chickpeas, peanuts, lentils, lupins, grass peas, mesquite, carob, tamarind, alfalfa, and clover. Legumes produce a botanically unique type of fruit – a simple dry fruit that develops from a simple carpel and usually dehisces on two sides.

<i>Trifolium repens</i> Flowering plant, bean family Fabaceae

Trifolium repens, the white clover, is a herbaceous perennial plant in the bean family Fabaceae. It is native to Europe, including the British Isles, and central Asia and is one of the most widely cultivated types of clover. It has been widely introduced worldwide as a forage crop, and is now also common in most grassy areas of North America, Australia and New Zealand. The species includes varieties often classed as small, intermediate and large, according to height, which reflects petiole length. The term 'white clover' is applied to the species in general, 'Dutch clover' is often applied to intermediate varieties, and 'ladino clover' is applied to large varieties.

<i>Panicum virgatum</i> Species of plant

Panicum virgatum, commonly known as switchgrass, is a perennial warm season bunchgrass native to North America, where it occurs naturally from 55°N latitude in Canada southwards into the United States and Mexico. Switchgrass is one of the dominant species of the central North American tallgrass prairie and can be found in remnant prairies, in native grass pastures, and naturalized along roadsides. It is used primarily for soil conservation, forage production, game cover, as an ornamental grass, in phytoremediation projects, fiber, electricity, heat production, for biosequestration of atmospheric carbon dioxide, and more recently as a biomass crop for ethanol and butanol.

<i>Vigna aconitifolia</i> Species of flowering plant

Vigna aconitifolia is a drought-resistant legume, commonly grown in arid and semi-arid regions of India. It is commonly called mat bean, moth bean, matki or dew bean. The pods, sprouts and protein-rich seeds of this crop are commonly consumed in India. Moth bean can be grown on many soil types, and can also act as a pasture legume.

<i>Desmanthus</i> Genus of legumes

Desmanthus is a genus of flowering plants in the mimosoid clade of the subfamily Caesalpinioideae of the pea family, Fabaceae. The name is derived from the Greek words δεσμός (desmos), meaning "bundle", and ἄνθος (anthos), meaning "flower". It contains about 24 species of herbs and shrubs that are sometimes described as being suffruiticose and have bipinnate leaves. Desmanthus is closely related to Leucaena and in appearance is similar to Neptunia. Like Mimosa and Neptunia, Desmanthus species fold their leaves in the evening. They are native to Mexico and North, Central and South America. Members of the genus are commonly known as bundleflowers. Donkey beans is another common name and originated in Central America, where Desmanthus species are highly regarded as fodder for these domestic draught animals.

<i>Cytisus proliferus</i> Species of legume

Cytisus proliferus, tagasaste or tree lucerne, is a small spreading evergreen tree that grows 3–4 m (10–13 ft) high. It is a well known fertilizer tree. It is a member of the Fabaceae (pea) family and is indigenous to the dry volcanic slopes of the Canary Islands, but it is now grown in Australia, New Zealand and many other parts of the world as a fodder crop.

<i>Chloris gayana</i> Species of grass

Chloris gayana is a species of grass known by the common name Rhodes grass. It is native to Africa but it can be found throughout the tropical and subtropical world as a naturalized species.

<i>Brachiaria</i> Genus of grasses

Brachiaria, or signalgrass, is a genus of plants in the grass family native to tropical and subtropical regions of Asia, Africa, Australia, southern Europe, the Americas, and various islands. There are over 100 species.

Bela "Bert" Grof was a Hungarian-born Australian agricultural researcher with contributions to grassland and forage research in the tropics.

<i>Psathyrostachys juncea</i> Species of grass

Psathyrostachys juncea is a species of grass known by the common name Russian wildrye. It was formerly classified as Elymus junceus. It is native to Russia and China, and has been introduced to other parts of the world, such as Canada and the United States. Psathyrostachys juncea is a great source of food for grazing animals, as it has high nutrition value in its dense basal leaves, even in the late summer and autumn seasons. This species can grow and prosper in many harsh environments, making it an ideal candidate for improvement as it can grow in areas were farming is difficult. This species is a drought-resistant forage plant and can survive during the cool seasons. It is also a cross-pollinator and is self-sterile. This means that P. juncea cannot self-fertilize; it must find another plant of the same species with which to exchange gametes. Self-sterilization increases the genetic diversity of a species.

Derrick Thomas was a British agricultural researcher with special contributions to grassland and forage research in the tropics.

<i>Urochloa brizantha</i> Species of plant

Urochloa brizantha is a species of grass known by the common name palisade grass. It is often used as a forage for livestock.

<i>Alysicarpus vaginalis</i> Species of flowering plant in the legume family

Alysicarpus vaginalis is a species of flowering plant in the legume family, Fabaceae. It is native to parts of Africa and Asia, and it has been introduced to other continents, such as Australia and the Americas. It is cultivated as a fodder for livestock, for erosion control, and as a green manure. Common names include alyce clover, buffalo clover, buffalo-bur, one-leaf clover, and white moneywort.

<i>Centrosema pubescens</i> Species of legume

Centrosema pubescens, common name centro or butterfly pea, is a legume in the family Fabaceae, subfamily Faboideae, and tribe Phaseolae. It is native to Central and South America and cultivated in other tropical areas as a forage for livestock.

<i>Chamaecrista rotundifolia</i> Species of legume

Chamaecrista rotundifolia, round-leaf cassia, also known as pasto rastiero, roundleaf sensitive pea, and Wynn cassia, is a short-lived perennial or self-generating annual plant in the subfamily Caesalpinioideae of the family Fabaceae. It originated in North America, Mesoamerica, the Caribbean, and Tropical South America but is grown in other parts of the world today. It grows in dry soils and areas of low rainfall, as well as in low-fertility and acidic soils with high levels of solubilized aluminum. It can also reduce erosion and runoff over time. These factors make it a potential asset to farmers in the African Subtropics and elsewhere where soil quality is a barrier to farming. It serves as a source of feed for livestock and acts as a green fertilizer, raising soil quality and nutrient content which can improve yields. These combined benefits make round-leaf cassia a potential solution to many problems faced by poor farmers and their communities.

<i>Digitaria eriantha</i> Species of grass

Digitaria eriantha, commonly known as digitgrass or Pangola-grass, is a grass grown in tropical and subtropical climates. It grows relatively well in various soils, but grows especially well in moist soils. It is tolerant to droughts, water lodging, suppresses weeds and grows relatively quickly after grazing. This grass demonstrates great potential for farmers in Africa in subtropical and tropical climates, mostly for livestock feed.

<i>Pueraria phaseoloides</i> Species of legume

Neustanthus is a monotypic genus of flowering plants belonging to the pea family Fabaceae and its tribe Phaseoleae. The only species is Neustanthus phaseoloides, called tropical kudzu. This species is a forage crop and cover crop used in the tropics. It is known as puero in Australia and tropical kudzu in most tropical regions.

<i>Vigna trilobata</i> Species of legume

Vigna trilobata, the African gram, three-lobe-leaf cowpea or jungle mat bean, is a regenerating annual herb found in India, Pakistan, Sri Lanka, Burma, Afghanistan and the Malay archipelago.

References

  1. 1 2 3 4 5 6 7 8 Schultze-Kraft, R; J.K. Teitzel (1992). "Brachiaria ruziziensis". Plant Resources of Southeast Asia (4): 65–67.
  2. 1 2 3 4 Silva, P; A. Martins (2013). "Development and validation of microsatellitte markers for Brachiaria ruziziensis obtained by partial genome assembly of illumine single-end reads". BMC Genomics. 14: 17. doi: 10.1186/1471-2164-14-17 . PMC   3565986 . PMID   23324172.
  3. Miles, J. W.; Maass, B. L.; do Valle, C. B., eds. (1996). Brachiara: biology, agronomy and improvement. ISBN   958-9439-57-8.
  4. 1 2 Heuzé V., Tran G., Boval M., Maxin G., Lebas F., 2017. Congo grass (Brachiaria ruziziensis). Feedipedia, a programme by INRA, CIRAD, AFZ and FAO.
  5. 1 2 Teixeria Resende, R; A. Auad (2012). "Impact of the Spittlebug Mahanarva spectabills on Signal Grass". Scientific World Journal. 2012: 1–6. doi: 10.1100/2012/926715 . PMC   3425814 . PMID   22927790.