| Author | Phan, Van Minh |
| Call Number | AIT Thesis no. AE-93-27 |
| Subject(s) | Lemnaceae
|
| Note | A Thesis Submitted in Partial Fulfilment of the Requirement for the Degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | The study was undertaken in outdoor conditions to determine the effect of natural light intensity, septage—nitrogen loading rate, and salinity on the productivity and protein content of duckweed, Lenma aequinoctialis.
The highest productivity of duckweed wag only observed in full sunlight when most days had a maximum light intensity below 100,000 lux, the lowest with 25 % ambient light, 4.4 g dry weight/m /day and 1 g dry weight/m [day, respectively. These corresponded to 1.5 g and 0.3 g true protein/m /day, respectively. The optimal range of septage—nitrogen loading rate varied from 5 mg to 15 mgN/L, depending on the level of ambient light of 25, 50 and 100%.
The nitrogen loading rate interacted with light intensity only when light intensity was optimal (below 100,000 lux) for duckweed growth (P < 0.001), indicating that light intensity is the predominant factor in this interaction. In constrast5 there wag an interaction between nitrogen loading rate and light intensity on the total nitrogen content of duckweed as it varied in all conditions of light intensity and nitrogen loading rate studied (P < 0.001).
Duckweed showed a significantly higher productivity at a salinity of 3 ppt than in freshwater or at 6 ppt (P < 0.05), suggesting a high mineral requirement of duckweed. There wag no interaction between salinity and nitrogen loading rate on either the productivity or total nitrogen content 01 duckweed, The highest productivity of duckweed at 3 ppt wag dry weight/m /day whereas it was only
1.9 g dry weight/m /day in fresh water.
|
| Year | 1993 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| 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) | Edwards, Peter
; |
| Examination Committee(s) | Yakupitiyage, Amararatne ;Little, David C. ; |
| Scholarship Donor(s) | The Government of New Zealand
; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1993 |