Sắn Việt Nam bảo tồn và phát triển bền vững

SẮN VIỆT NAM BẢO TỒN VÀ PHÁT TRIỂN BỀN VỮNG,
CASSAVA CONSERVATION AND SUSTAINABLE DEVELOPMENT IN VIETNAM, Trong sách: Sản xuất sắn bền vững ở châu Á đối với nhiều mục đích sử dụng và cho nhiều thị trường. Reihardt Howeler (biên tập) và nhiều tác giả CIAT 2015. Sách Vàng nghề sắn Thông tin dưới đây là lời cám ơn và một số thư mục tài liệu sắn đã xuất bản

ACKNOWLEDGEMENT

The authors sincerely acknowledge the contributions of many colleagues who participated and contributed to the Vietnam National Cassava Program (VNCP), as shown in the references below.

REFERENCES

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Trinh Thi Phuong Loan, Nguyen Trong Hien, Dao Huy Chien, Tran Ngoc Ngoạn and Nguyen Viet Hung. 2008. The results of breeding and developing variety KM98-7. In: MARD, Agricultural Research Workshop , held at Vietnam Academy of Agricultural Science (VAAS), Hanoi. Sep.13, 2008.

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Những thay đổi gần đây trong ngành sắn Việt Nam
Sắn Việt Nam bảo tồn và phát triển bền vững

RECENT CHANGES IN THE CASSAVA SECTOR IN VIETNAM
Nguyen Van Bo (1) and the Vietnam Cassava Research and Development Network
(1) Vietnam Academy of Agricultural Science, Hanoi, Vietnam.


The cassava production and processing industry in Vietnam has experienced enormous
changes in the last decade. During the past 20 years the area planted to cassava has nearly doubled, from about 278,000 ha in 1993 to 544,000 hectares in 2013, while at the same time, with the adoption of high-yield and high-starch varieties, the average yield has also doubled from 9 to about 18 t/ha. The vast majority of cassava in Vietnam is produced by smallholder farmers, for whom it constitutes one of the more important sources of income, especially in poorer communities.

Cassava processing was a very minor business in Vietnam just 20 years ago, whereas now there are more than 80 large cassava starch-processing factories throughout the country, with many more smaller factories. In Tay Ninh Province, which is the largest producer of cassava and has the highest average yield, there are more than 80 starch factories, both large and small. The export of dried cassava chips and of processed starch has grown from a minor industry and now constitutes one of the larger export sectors. Much of the export of cassava products, particularly dried chips, goes to China, with smaller amounts, mainly of starch, to Singapore and elsewhere. In 2010 export
income from cassava grew faster than any other export, with a final value of more than US$800 million, making cassava one of the top agricultural export commodities.

A new area of processing is ethanol for use as fuel. The country’s four ethanol-producing plants have a capacity of 320 million liters per year, with another 300 million liters of capacity expected to come on line soon from three plants under construction in Phu Tho, Quang Ngai and Binh Phuoc Provinces. At the current production levels of cassava, these ethanol plants could consume as much as one-third of total production and half of current exports of chips, much of which is currently used for bio-ethanol production in China.

While the industry is in good health, there are risks. High-yielding and high-starch
varieties have been adopted by most farmers in Vietnam, but about three-quarters of all cassava grown is one variety, namely KM 94. Currently this variety performs well; however, there are always concerns when one variety dominates to such an extent. There are several promising recently released varieties that should be good alternatives to KM 94, but a more systematic approach to breeding and varietal distribution is needed. Cassava production has been largely pest and disease free for many years, but this is changing. The cassava mealybug, Phenacoccus manihoti, has caused major problems in Thailand and Cambodia, although as yet has not been a major problem in Vietnam. By contrast, there are a number of diseases that are causing concerns. A
timely response to all cassava pest and diseases, in terms of cultural measures of control and breeding for resistance, is now needed. Another threat to cassava production is the low sustainability of many cassava production systems in terms of management of soil fertility and prevention of soil degradation from erosion. The challenge is to work with farmers to identify which are the most appropriate site-specific management systems.

CASSAVA CONSERVATION AND SUSTAINABLE DEVELOPMENT IN VIETNAM
Hoang Kim (1), Nguyen Thi Truc Mai (2), Nguyen Bach Mai (3) and Reinhardt Howeler (4)


(1) Nong Lam University (NLU), Linh Trung, Thu Duc, Ho Chi Minh City, Vietnam;
hoangkim.vietnam@gmail.com; hoangkim@hcmuaf.edu.vn
(2) Hue University of Agriculture and Forestry (HUAF), 102 Phung Hung, Hue, Vietnam;
maiyourlove2003@yahoo.com
(3) Tay Nguyen University (TNU), 567 Le Duan – Buon Ma Thuot , Dak Lak , Vietnam;
maithuyantam@gmail.com
(4) CIAT-Emeritus; r.howeler@cgiar.org

ABSTRACT
The project entitled “Vietnam Cassava Conservation and Sustainable Development” has been very successful, as indicated by the results of trials and demonstrations conducted in Tay Ninh, Dak Lak, Phu Yen and Dong Nai provinces, where farmers using the improved technologies and practices boosted cassava yields from 8.5 t/ha to 36 t/ha – a more than four fold increase.

During the period from 1975 to 2015 cassava has become the third most important food
crop in Vietnam, after rice and maize. In 2013 the cassava area in Vietnam reached 544,300 ha, with a production of 9.74 million tonnes, and an average yield of 17.9 t/ha. Within Asia, Vietnam is now the third largest cassava producer, after Thailand and Indonesia. Between 1975 and 2000, cassava yields in the country ranged from 6 to 8 t/ha, and the crop was grown mainly for human food and animal feeding. This changed markedly with the introduction by CIAT in 1988 of some high-yielding breeding lines and varieties from Thailand. Two varieties, Rayong 60 and KU 50, were selected for release in 1993 and 1995 and were named KM60 and KM94, respectively. During the 1990s and the first decade of the 21st Century, Vietnam produced several new cassava varieties, initially mainly selections from sexual seed from Thailand and CIAT, such as KM95-3, SM937-26, KM98-1, KM98-7, but our breeders also made crosses that resulted in the release of the latest new varieties: KM140, KM98-5, KM419 and others. The breeding and adoption of new varieties as well as the development and adoption of more sustainable production practices resulted in a complete transformation of cassava, from a poor man’s food crop to a highly profitable industrial crop.

More recently, new advances in cassava cultivation techniques have focused on key
demonstration sites in the provinces of Tay Ninh, Dak Lak and Phu Yen using mainly KM419 as a very promising short-duration cassava variety with a fresh root yield of about 35-55 t/ha (28% higher than KM94) and a starch content of about 28-31%. This and other new varieties, together with new advances in cassava cultivation techniques, have yielded spectacular results in trials organized in those three provinces.

The Vietnam National Cassava Program (VNCP) has introduced various methodologies, named “6M” and “10T”, as well as Farmer Participatory Research (FPR), as collaborative experiences that helped to bring advanced technologies into production for millions of poor farmers. This included the selection of high-yielding varieties and the testing and selection by farmers of locally appropriate technologies. Cassava in Vietnam has great potential but also faces big challenges. At the national level, cassava has become one of the main export crops, which has provided for millions of smallholders an opportunity to increase their yields and improve their
standard of living.

Key words: Cassava, production, utilization, cultivation techniques, achievements, lessons and challenges, conservation, sustainable development, Vietnam.

OVERVIEW OF CASSAVA PRODUCTION AND UTILIZATION IN VIETNAM

Current Cassava Production in the World and in Vietnam

Cassava (Manihot esculenta Crantz) has become one of the most important crops in
the world, used as food, feed and fuel (Table 1). In terms of production, cassava currently ranks 5th, far behind maize, rice, wheat, and potato. But, in many tropical countries, especially in Africa, it is the most, or second most, important food crop. Cassava is not only a crop used for food, but also for animal feed, starch processing and in many countries it is currently the main raw material for biofuel processing, including in Vietnam (Nguyen Van Bo et al., 2013). Compared with 1980, the cassava growing area in the world in 2011 had increased 44%, more than any other food crop (Howeler, R.H. 2014).

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SẢN XUẤT SẮN BỀN VỮNG Ở CHÂU Á
đối với nhiều mục đích sử dụng và cho nhiều thị trường

Reihardt Howeler (biên tập) và nhiều tác giả. CIAT 2015. Sách Vàng nghề sắn (tại đây)



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