Nitrogen supplementation and weed management using duckweed (Lemna aequinoctialis) in flooded rice | |
| Author | Dinh Thi Nha Truc |
| Call Number | AIT Thesis no.AS-06-31 |
| Subject(s) | Duckweeds Weeds--Control Rice |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Agricultural System and Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AS-06-31 |
| Abstract | Duckweed (Lemn(i aeyuinocliali.c) is a minute plant capable of fixing N and fast growing in natural water habitats. This study was conducted at the Agricultural Systems Research Farm. Asian Institute of Technology during May to September 2006 to exploit and assess potential of duckweed plant for supplementing the N requirement and reduce the rice-weed competition in lowland rice. Four populations of duckweed (viz. 0, 25, 50 and 75 percent of the surface area of rice covered by duckweed) and three doses of N (viz. 0. 55 and 1 10 - recommended rate of N) were factorially combined to make 12 treatment combinations and tested together with a control (without duckweed) in a complete randomized design with three replicates. The study showed that there was a highly significant effect of duckweed populations on ammonium-N and nitrate-N concentrations compared to control. Duckweed initially increased its population, but degeneration occurred after flowering of rice. The rapid population increase and shading made by duckweed suppressed %Need growth in rice. Root and shoot weight, number of tillers and panicles per hill. number of grains per panicle, filled grain number, and 1000-grain weight and grain yield in rice increased in duckweed associated containers when compared to control. Duckweed association increased N uptake by rice plants and soil N content |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AS-06-31 |
| 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 Aquatic Systems (AS) |
| Chairperson(s) | Ranamukhaarachchi, S.L.; |
| Examination Committee(s) | Jayasuriya, H.P.W. ;Clemente, R.S. ; |
| Scholarship Donor(s) | MOET, Vietnam I AIT Fellowship; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 2006 |