| Author | Arshad, Muhammad |
| Call Number | AIT RSPR no.AS-09-02 |
| Subject(s) | Rice--Varieties--Thailand, Central
|
| Note | A research study submitted in partial fulfillment of the requirements for the degree of
Master of Science in
Agricultural Systems & Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Research studies project report ; no. AS-09-02 |
| Abstract | For varieties based accurate crop land cover classification, knowledge of their potential
inter discriminating factors is important before imaging their cultivated land area for early
and nearly accurate grain production estimation prior to harvesting. Before harvesting
nearly accurate variety based land area computation for grain production estimation can
help reduce the risk of grain deficiency by taking appropriate grain supply chain
maintenance decisions.
This research study consisted of a field based experimentation to establish spectral
signatures of eight rice varieties namely IR 31, Suphanburi 90, Suphanburi 3,
Pathumthani1, IR 35, Suphanburi1, Suphanburi 60 and Pisanulok 2 which are commonly
grown in central part of the Thailand. Bidirectional spectral reflectance measurements were
done for forward and backward as well as from right and left side for the reflected Sun
light from target canopies of above mentioned rice varieties at maximum tillering stage.
For reflectance measurements nadir (00) and off nadir viewing angles (+450, +300, +150, -
150, -300, -450) and wavelength spectrum from 400 nm to 1050 nm were considered and
measured using a portable spectrometer.
Spectral signatures obtained from eight varieties were compared for specified viewing
angles, wavelength bands and directions among them. The wavebands and viewing angles
which discriminated all of the varieties from each other were evaluated as 540 nm to 560
nm for nadir and off nadir viewing angles i.e. -450, +150, +450 and 840 nm to 860 nm
wavelength at -150 for perpendicular plane. Similarly 530 nm to 560 nm and from 640 nm
to 680 nm at +300 and -150 respectively in principal plane are potential wavelength bands
and viewing angles which can discriminate all eight rice varieties.
In addition, a few narrow bands of spectral indices was also tested and normalized
difference vegetation index at nadir in both perpendicular and principal planes, red edge
reflectance at -450 in perpendicular plane, simple ratio pigment index at nadir in
perpendicular plane and at +300 in principal plane, and photochemical reflectance index at
nadir in perpendicular plane were evaluated as potential indices for differentiation among
all eight rice varieties
Plant growth parameters were also studied and insignificant differences among rice
varieties were found except for leaf angle. Despite of their insignificance differences
among rice varieties, significant correlation was found between chlorophyll content and
reflectance in green peak at -450,-150 and +450 in perpendicular plane, between plant
height and reflectance at +450 in perpendicular plane, between leaf dry weight and
photochemical reflectance index at nadir in perpendicular plane, and between number of
tillers and reflectance at +300 in principal plane. This indicates their potential for plant
growth and development studies especially to determine crop health status by using
remotely sensed data. |
| Year | 2009 |
| Corresponding Series Added Entry | Asian Institute of Technology. Research studies project report ; no. AS-09-02 |
| Type | Research Study Project Report (RSPR) |
| 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) | Ranamukharachchi, S. L. ; |
| Examination Committee(s) | Kiyoshi, Honda;Shrestha, Rajendra P.; |
| Scholarship Donor(s) | Higher Education Commission (HEC),
Pakistan - AIT Fellowship; |
| Degree | Research Studies Project Report (M.Sc.) - Asian Institute of Technology, 2004 |
