For further information contact: Reinhardt Howeler

Visit our CIAT Library and the Bibliographical Cassava Database

Asher, C.J., D.G. Edwards and R.H. Howeler. 1980. Nutritional Disorders of Cassava (Manihot esculenta Crantz). Univ. of Queensland, St. Lucia, Q., Australia. 48 pp.

Center Internacional de Agricultura Tropical (CIAT). 1998. Integrated Crop-Soil Management for Sustainable Cassava-based Cropping Systems. End-of -Project Report, 1994-1998. Submitted to Nippon Foundation. 38p.

Centro Internacional de Agricultura Tropical (CIAT). 2001. Annual Report 2001. Project PE-5. Sustainable Systems for Smallholders. pp. 43-68.

Cock, J.H. and R.H. Howeler. 1978. The ability of cassava to grow on poor soils. In: Crop Tolerance to Suboptimal Land Conditions. ASA, CSSA, SSSA. Madison, WI, USA. p. 145-153.

Garrity, D., A. Mercado, R.H. Howeler and S. Fujisaka. 2000. Participatory methods in research and extension for using forages in conservation farming systems: Managing the trade-off between productivity and resource conservation. In: W.W. Stür, P.M. Horne, J.B. Hacker and P.C. Kerridge (Eds.). Working with Farmers: The Key to Adoption of Forage Technologies. Proc.  Intern. Workshop, held in Cagayan de Oro city, Mindanao, Philippines. Oct 12-15, 1999. ACIAR Proc. # 95. Canberra, Australia. pp. 254-272.

Howeler, R.H. 1981. Mineral Nutrition and Fertilization of Cassava. CIAT, Cali, Colombia. CIAT Series No. 09-EC-4. 52 p.

Howeler, R.H. 1985. Potassium nutrition of cassava. In: R.D. Munson (Ed.). Potasium in Agriculture. Proc. Intern. Symp., held in Atlanta, GA, USA. July 7-10, 1985. American Soc. Agronomy, Madison, WI., USA. pp. 819-841.

Howeler, R.H. 1986. El control de la erosión con practicas agronomicas sencillas. Suelos Ecuatoriales. Revista de la Sociedad Colombiana de la Ciencia de Suelo 16:70-84.

Howeler, R.H. 1987. Soil conservation practices in cassava-based cropping systems. In: T.H. Tay, A.M. Mokhtaruddin and A.B. Zahari (Eds.). Proc. Intern. Conf. on Steepland Agriculture in the Humid Tropics, held in Kuala Lumpur, Malaysia. Aug 16-21, 1987. pp. 490-517.

Howeler, R.H. 1989. Cassava. In: D.L. Plucknet and H.B. Sprague (Eds.). Detecting Mineral Nutrient Deficiencies in Tropical and Temperate Crops. Westview Press. Boulder, San Francisco and London. pp. 167-177.

Howeler, R.H. 1990. Phosphorus requirements and management of tropical root and tuber crops. In: Proc. Symp. on Phosphorus Requirements for Sustainable Agriculture in Asia and Oceania, held at the Intern. Rice Res. Inst. (IRRI), Los Banos, Philippines. March 6-10, 1989. pp. 427-444.

Howeler R.H. 1991a. Long-term effect of cassava cultivation on soil productivity. Field Crops Research 26:1-18.

Howeler, R.H. 1991b. Identifying plants adaptable to low pH conditions. In: R.J. Wright et al. (Eds.). Plant-Soil Interactions at Low pH. Kluwer Academic Publisher, Netherlands. pp. 885-904.

Howeler, R.H. 1992. Agronomic research in the Asian Cassava Network -  An overview 1987-1990. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy and Utilization Research in Asia. Proc. 3rd Regional Workshop, held in Malang, Indonesia. Oct 22-27, 1990. pp. 260-285.

Howeler, R.H. 1994. Integrated soil and crop management to prevent environmental degradation in cassava-based cropping systems in Asia. In: J.W.T. Bottema and D.R. Stoltz (Eds.). Upland Agriculture in Asia. Proc. Workshop, held in Bogor, Indonesia. April 6-8, 1993. pp. 195-224.

Howeler, R.H. 1995. Agronomy research in the Asian Cassava Network – Towards better production without soil degradation. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy Research and Technology Transfer in Asia. Proc. 4th Regional Workshop, held in Trivandrum, Kerala, India. Nov 2-6, 1993. pp. 368-409.

Howeler, R.H. 1996a. Diagnosis of nutritional disorders and soil fertility maintenance of cassava. In: G.T. Kurup et al. (Eds.). Tropical Tuber Crops. Problems, Prospects and Future Strategies. Oxford and IBH Publishing Co. Pvt. Ltd., New Delhi, India. pp. 181-193.

Howeler, R.H. 1996b. The use of farmer participatory research methodologies to enhance the adoption of soil conservation practices in cassava-based cropping systems in Asia. In: S. Sombatpanit, M.A. Zöbish, D.W. Sanders and M.G. Cook (Eds.). Soil Conservation Extension – From Concepts to Adoption. Proc. Intern. Workshop on soil Conservation Extension, held in Chiang Mai, Thailand. June 4-11, 1995. pp. 159-168.

Howeler, R.H. 1996c. Mineral nutrition of cassava. In: E.T. Craswell, C.J. Asher and J.N. O’Sullivan (Eds.). Mineral Nutrient Disorders of Root Crops in the Pacific. Proc. Workshop, held in Nuku’alofa, Kingdom of Tonga. April 17-20, 1995. ACIAR Proc. #65. Canberra, Australia. pp. 110-116.

Howeler, R.H. 1998. Cassava agronomy research in Asia. - An overview 1993 -1996. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy and Farmer Participatory Research in Asia. Proc. 5th Regional Workshop, held in Danzhou, Hainan, China. Nov 3-8, 1996. pp. 355-375.

Howeler, R.H. 1999. Developing sustainable cassava production systems with farmer's involvement in Asia. In: S. Fujisaka (Ed.). Systems Research and Farmer Participatory Research. Developments in Research on Natural Resource Management, held at CIAT, Cali, Colombia. Dec 1-2, 1997. pp. 86-102.

Howeler, R.H. 2000. Cassava production practices – Can they maintain soil productivity? In: R.H. Howeler, C.G. Oates and G.M. O’Brien (Eds.). Cassava, Starch and Starch Derivatives. Proc. Intern. Symp., held in Nanning, Guangxi, China. Nov 11-15, 1996. pp. 101-117.

Howeler, R.H. 2001a. Cassava agronomy research in Asia: Has it benefited cassava farmers? In: R.H. Howeler and S.L. Tan (Eds.). Cassava’s Potential in Asia in the 21st Century: Present Situation and Future Research and Development Needs. Proc. 6th Regional Workshop, held in Ho Chi Minh city, Vietnam. Feb 21-25, 2000. pp. 345-382.

Howeler, R.H. 2001b. The use of farmer participatory research (FPR) in the Nippon Foundation Project: Improving the sustainability of cassava-based  cropping systems in Asia. In: R.H. Howeler and S.L. Tan (Eds.). Cassava’s Potential in Asia in the 21st Century: Present Situation    and Future Research and Development Needs. Proc. 6th Regional Workshop, held in Ho Chi   Minh city, Vietnam. Feb 21-25, 2000. pp. 461-489.

Howeler, R.H. 2002. Cassava mineral nutrition and fertilization. In: R.J. Hillocks, M.J. Thresh and A.C. Bellotti (Eds.). Cassava: Biology, Production and Utilization. CABI Publishing, CAB International, Wallingford, Oxon, UK. Chapter 7. pp. 115-147.

Howeler, R.H. and L.F. Cadavid. 1983. Accumulation and distribution of dry matter and nutrients during a 12 month growth cycle of cassava. Field Crops Research 7:123-139.

Howeler, R.H. and L.F. Cadavid. 1984. Practicas de conservación de suelos para la producción de yucca en ladera. In: Proc. 2nd Congreso Nacional de la Ciencia del Suelo. Oct 4-8, 1983. Pasto, Colombia. Suelos Ecuatoriales 14:303-310.

Howeler, R.H. and L.F. Cadavid. 1990. Short- and long-term fertility trials in Colombia to determine the nutrient requirements of cassava. Fertilizer Research. 26: 61-80.

Howeler, R.H. and F. Fernandez. 1985. Nutritional Disorders of the Cassava Plant. Study Guide, CIAT, Cali, Colombia. 36 p.

Howeler, R.H. and S. Guzman. 1985.   Practicas de conservación de suelo en explotaciónesagropecuarias en ladera.    In: Memorias III Congreso Nacional sobre Manejo de Cuencas Hidrograficas, held in Cali, Colombia. Aug 6-10, 1985. pp. 208-238.

Howeler, R.H. and G. Henry. 1998. Farmer participatory research for cassava technology transfer in Asia – Constraints and opportunities. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy and Farmer Participatory Research in Asia. Proc. 5th  Regional Workshop, held in Danzhou, Hainan, China. Nov 3-8, 1996. pp. 497-514.

Howeler, R.H., D.G. Edwards and C.J. Asher. 1982. Micronutrient deficiencies and toxicities of cassava plants grown in nutrient solutions. I. Critical tissue concentrations. J. Plant Nutrition  5:1059-1076.

Howeler, R.H. and E. Sieverding. 1983. Potentials and limitations of mycorrhizal inoculation illustrated by experiments with field-grown cassava.  Plant and Soil 75:245-261.

Howeler, R.H., H.C. Ezumah and D.J. Midmore. 1993. Tillage systems for root and tuber crops. Soil and Tillage Research 27:211-240.

Howeler, R.H., Nguyen The Dang and W. Vongkasem. 1998. Farmer participatory selection of vetiver grass as the most effective way to control erosion in cassava-based cropping systems in Vietnam and Thailand. In: Proc. 1st Intern. Conf. on Vetiver: A Miracle Grass, held in Chiang Rai, Thailand. Feb 4-8, 1996. Office of the Royal Developm. Project Board, Bangkok, Thailand. pp. 259-272.

Howeler, R.H., C.G. Oates and C. Allem. 2001. Strategic Environmental Assessment: An Assessment of the Impact of Cassava Production and Processing on the Environment and Biodiversity.  Proc. of the Validation Forum on the Global Cassava Development Strategy, held in Rome, Italy. April 26-28, 2000. FAO/IFAD, Rome. Volume 5, 137 p.

Howeler, R.H., E. Sieverding and S.R. Saif. 1987. Practical aspects of mycorrhizal technology in some tropical crops and pastures.   Intern. Symp.: Plant and Soil; Interfaces and Interactions,  held in Wageningen, the Netherlands. Aug 6-8, 1986. pp. 249-283.

Howeler, R.H., Thai Phien and Nguyen The Dang. 2001. Sustainable cassava production on sloping lands in Vietnam. Proc. of Workshop on Training, Research and Technology Transfer Needs for Sustainable Development of Sloping Land in Vietnam, held in Hanoi, Vietnam. Apr 10-12, 2001. pp. 59-80.

Huang Jie, Li Kaimian, Zhang Weite, Lin Xiong and R.H. Howeler. 2001. Practices and progress in farmer participatory research in China. In: R.H. Howeler and S.L. Tan (Eds.). Cassava’s Potential in Asia in the 21st Century: Present Situation and Future Research and Development Needs. Proc. 6th Regional Workshop, held in Ho Chi Minh city, Vietnam. Feb 21-25, 2000. pp. 413-423.

Leihner, D. 1983. Management and Evaluation of Intercropping Systems with Cassava. Centro Internacional de Agricultura Tropical (CIAT), Cali, Colombia. 70 p.

Leihner, D.E. 1999. Cassava agronomy and cropping systems. In: R.J. Hillocks, M.J. Thresh and A. Bellotti (Eds.). Cassava: Biology. Production and Utilization. CABI Publishing, CAB          International, Wallingford, Oxon, UK. Chapter 6. pp. 91-113.

Lee Jun, Huang Jie, Tian Yinong and Zhang Weite. 2001. Cassava agronomy research and adoption of improved practices in China – Major achievements during the past 20 years. In: R.H. Howeler and S.L. Tan (Eds.). Cassava’s Potential in Asia in the 21st Century: Present Situation and Future Research and Development Needs. Proc. 6th Regional Workshop, held in Ho Chi Minh city, Vietnam. Feb 21-25, 2000. pp. 300-313.

Lynam, J.K. and K.T. Ingram. 2001. The Nippon Foundation Project on Improving the Sustainability of Cassava- based Cropping Systems in Asia – A Project Evaluation Report. In: R.H. Howeler and S.L. Tan (Eds.). Cassava’s Potential in Asia in the 21st Century: Present Situation and Future Research and Development Needs. Proc. 6th Regional Workshop, held inHo Chi Minh city, Vietnam. Feb 21-25, 2000. pp. 490-516.

Nguyen Huu Hy, Pham Van Bien, Nguyen The Dang and Thai Phien. 1998. Recent progress in cassava research in Vietnam. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy and Farmer Participatory Research in Asia. Proc. 5th Regional Workshop, held in Danzhou, Hainan, China. Nov 3-8, 1996. pp. 235-256.

Nguyen Huu Hy, Nguyen The Dang and Pham Van Bien. 2001. Cassava agronomy research and adoption of improved practices in Vietnam. In: R.H. Howeler and S.L. Tan (Eds.). Cassava’s Potential in Asia in the 21st Century: Present Situation and Future Research and Development Needs. Proc. 6th Regional Workshop, held in Ho Chi Minh city, Vietnam. Feb 21-25, 2000. pp. 216-227.

Nguyen The Dang, Tran Ngoc Ngoan, Le Sy Loi, Dinh Ngoc Lan and Thai Phien. 1998. Farmer participatory research in cassava soil management and varietal dissemination in Vietnam. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy and Farmer Participatory Research in Asia. Proc. 5th Regional Workshop, held in Danzhou, Hainan, China. Nov 3-8, 1996. pp. 454-470.

Nguyen The Dang, Tran Ngoc Ngoan, Dinh Ngoc Lan,Le Sy Loi and Thai Phien. 2001. Farmer participatory research in cassava soil management and varietal dissemination in Vietnam –Results of Phase 1 and plans for Phase 2 of the Nippon Foundation Project. In: R.H. Howeler and S.L. Tan (Eds.). Cassava’s Potential in Asia in the 21st Century: Present Situation and Future Research and Development Needs. Proc. 6th Regional Workshop, held in Ho Chi Minh city, Vietnam. Feb 21-25, 2000. pp. 383-401.

Putthacharoen, S., R.H. Howeler, S. Jantawat and V. Vichukit. 1998. Nutrient uptake and soil loss due to erosion in cassava as compared to six other crops in a Psamment in eastern Thailand. Field Crops Research 57: 113-126.

Thai Phien and Nguyen Cong Vinh. 1998. Nutrient management for cassava- based cropping systems in northern Vietnam. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy and Farmer Participatory Research in Asia. Proc. 5th Regional Workshop, held in Danzhou, Hainan, China. Nov 3-8, 1996. pp. 268-279.

Tongglum, A., V. Pornpromprathan, K. Paisarncharoen, C. Wongwitchai, C. Sittibusaya, S. Jantawat, T. Nual-On and R.H. Howeler. 1998. Recent progress in cassava agronomy research in Thailand. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy and Farmer Participatory Research in Asia. Proc. 5th Regional Workshop, held in Danzhou, Hainan, China. Nov 3-8, 1996. pp. 211-234.

Tongglum, A., P. Suriyapan and R.H. Howeler. 2001. Cassava agronomy research and adoption of improved practices in Thailand – Major achievements during the past 35 years. In: R.H. Howeler and S.L. Tan (Eds.). Cassava’s Potential in Asia in the 21st Century: Present Situation and Future Research and Development Needs. Proc. 6th Regional Workshop, held in Ho Chi Minh city, Vietnam. Feb 21-25, 2000. pp. 228-258.

Utomo, W.H., Suyamto, H. Santoso and A. Sinaga. 1998. Farmer participatory research in soil management in Indonesia. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy and Farmer Participatory Research in Asia. Proc. 5th Regional Workshop, held in Danzhou, Hainan, China. Nov 3-8, 1996. pp. 471-481.

Utomo, W.H., Suyamto and A. Sinaga. 2001. Implementation of farmer participatory research (FPR) in the transfer of cassava technologies in Indonesia. In: R.H. Howeler and S.L. Tan (Eds.). Cassava’s Potential in Asia in the 21st Century: Present Situation and Future Research and Development Needs. Proc. 6th Regional Workshop, held in Ho Chi Minh city, Vietnam. Feb          21-25, 2000. pp. 424-435.

Vongkasem, V., K. Klakhaeng, S. Hemvijit, A. Tongglum, S. Katong and D. Suparhan. 1998. Farmer participatory research in soil management and varietal selection in Thailand. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy and Farmer Participatory Research in Asia. Proc. 5th Regional Workshop, held in Danzhou, Hainan, China. Nov 3-8, 1996. pp. 412-437.

Vongkasem, W., K. Klakhaeng, S. Hemvijit, A. Tongglum, S. Katong, D. Suparhan and R.H. Howeler. 2001. Reducing soil erosion in cassava production systems in Thailand – A farmer participatory approach. In: R.H. Howeler and S.L. Tan (Eds.). Cassava’s Potential in Asia in the 21st Century: Present Situation and Future Research and Development Needs. Proc. 6th Regional Workshop, held in Ho Chi Minh city, Vietnam. Feb 21-25, 2000. pp. 402-412.

Wargiono, J., Kushartoyo, Suyamto H. and B. Guritno. 1998.  Recent progress in cassava agronomy research in Indonesia. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy and Farmer Participatory Research in Asia. Proc. 5th Regional Workshop, held in Danzhou, Hainan, China. Nov 3-8, 1996. pp. 307-330.

Wargiono, J., Y. Widodo and W.H. Utomo. 2001. Cassava agronomy research and adoption of improved practices in Indonesia – Major achievements during the past 20 years. In: R.H. Howeler and S.L. Tan (Eds.). Cassava’s Potential in Asia in the 21st Century: Present Situation and Future Research and Development Needs. Proc. 6th Regional Workshop, held in Ho Chi Minh city, Vietnam. Feb 21-25, 2000. pp. 259-278.

Zhang Weite, Lin Xiong, Li Kaimian, Huang Jie, Tian Yinong, Lee Jun and Fu Quohui. 1998a. Cassava agronomy research in China. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy and Farmer Participatory Research in Asia. Proc. 5th Regional Workshop, held in Danzhou, Hainan, China. Nov 3-8, 1996. pp. 191-210.

Zhang Weite, Lin Xiong, Li Kaimian and Huang Jie. 1998b. Farmer participatory research in cassava soil management and varietal dissemination in China. In: R.H. Howeler (Ed.). Cassava Breeding, Agronomy and Farmer Participatory Research in Asia. Proc. 5th Regional Workshop, held in Danzhou, Hainan, China. Nov 3-8, 1996. pp. 389-411.