An evaluation of the changes in rice-fresh water shrimp farming systems in the Mekong Delta of Vietnam : a case study | |
| Author | Nguyen Van Sanh |
| Call Number | AIT Thesis no. AE-91-44 |
| Subject(s) | Shrimp culture--Vietnam--Mekong Delta Rice--Vietnam--Mekong Delta--Planting |
| Note | A Thesis submitted in partial fulfillment of the requirements for the degree of Master of Science |
| Publisher | Asian Institute of Technology |
| Abstract | The rice-fresh water shrimp is a new farming system in the Mekong Delta. This study aims at determining factors that contributes towards the improvement of the system and to investigate the performance of the system. A survey at the village that pioneer this system was carried out in 1988. This study conducts a survey on the same £armers in 1990. The data permits the evaluation of the changes in the farms during tow years. The changes in gross margin indicates the change in their incomes. The Cobb-Douglas production function of rice and shrimp were used to determine relationship between inputs and outputs in the system. The study shows that the gross margin per hectare of rice decreased by 4 percent while that of shrimp increases by 19 % in wet-dry rice season + shrimp pattern and 19 % in wet-main rice season + shrimp. The gross margin of monoculture shrimp gives 15 percent higher gross margin when compared with rice. There is a reallocation of land and labor from rice production to shrimp. Which less land, the output of rice has been maintained by the increase in fertilizer use, specially, nitrogen but not phosphorus. The production f unction shows that after the reallocation, the productivity of canal in rice production has decreased in 1990. The productivity of labor also declines for the wet season but not for the dry season rice production. The productivity of nitrogen decreases sharply for 1990. However the productivity of phosphorus increases sharply. The rice-shrimp system can be improved further by increasing the shrimp seed, feeding and labor. The rice production can be improved by using more phosphorus. Farmers can still increase their income further on this farm system. |
| Year | 1991 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Suthad Setboonsarng; |
| Examination Committee(s) | Upasena, S.H.;Little, David C.; |
| Scholarship Donor(s) | Thai King's Scholarship; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1991 |