Information on Doctoral Thesis of Fellows Hoang Kim Dieu

- Title of thesis:: Study on the growth, development and cultivation techniques for new variety of cassava in some northern mountainous provinces,  Vietnam.

- Specialty: Crop Science

- Code: 62 62 01 10

- Name: Hoang Kim Dieu

- Scientific supervisors:

            1. Assoc. Prof. Nguyen Viet Hung, Ph.D

            2. Prof. Dr. Tran Ngoc Ngoan, Ph.D

- Training institution: Thai Nguyen University of Agriculture and Forestry, Thai Nguyen University

THE NEW SCIENTIFIC FINDINGS

            1. Evaluated the adaptability of 7 cassava varieties in some northern mountainous provinces in Vietnam

           2. Based on the gene interaction analysis by application of mathematical models of Aberhart and Russell, HL2004-28 cassava variety was selected as a wide adaptable variety to ecological conditions in midland and northern mountainous regions to utilize for experiments on high yield cultivation techniques.

            3. Based on the results of experiments on high yield cultivation techniques, a combined cultivation methods for HL2004-28 cassava variety were identified: cropping season from 04/3 to 14/3; harvest time: 10 months after planting; planting density: 10000-12500 plants/ha; intercropping with peanuts and fertilizers

            4. One cassava variety named HL2004-28 was selected as a prospect variety and cultivation techniques this variety was built. This cultivation technique was proved to produce higher yield and higher benefit compared to the local varieties, accounting for 33.7% and 44.2%, respectively.

PRACTICAL APPLICABILITY AND THE NEEDS FOR FURTHER STUDIES:

            * Practical applicability:

            - The research applied a mathematical model to evaluate the adaptability of 7 cassava varieties in some northern mountainous provinces.

            - Combined cultivation methods for HL2004-28 cassava variety were identified: cropping season from 04/3 to 14/3; harvest time: 10 months after planting; planting density: 10000-12500 plants/ha; intercropping with peanuts and fertilizering

90kg N + 40kg  P₂O₅ + 80kg K₂O  + 3 tons Song Gianh microbial organic fertilizer or 90kg N + 40kg P₂O₅  + 80kg K₂O/ha + 15 tons of organic fertilizer.

            - The results of the thesis contributed scientific basis, orientation and cassava breeding methods for higher production. Additionally, the study results can be used as material for scientific research and teaching.

            * Opening issues for further studies:

            HL2004-28 cassava variety should be further evaluated and trials in a wider scale in other areas and studied cultivation techniques suitable for northern mountains regions.