Tiller dynamics and yield of parent and clonal plant of transplanted rice | |
| Author | Biswas, Parimal Kanti |
| Call Number | AIT Diss. no.AS-01-07 |
| Subject(s) | Rice--Transplanting Plants, Cultivated |
| Note | A dissertation submitted in partial fulfillment of the requirements for the degree of Doctoral Technical Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Dissertation ; no. AS-01-07 |
| Abstract | Rice crop suffers due to natural disasters like flooding, pest incidence and drought. These losses are usually mitigated by transplanting with new seedlings from nurseries. This delays the total cultivation by more than 1 to 1.5 months. Such a delayed transplanting with nursery seedlings is not feasible in SOme countries due to photoperiod and low temperature restrictions. Hence this study was conducted to determine the feasibility of using clonal tillers in recuperating the lost crop, the potential of obtaining c10nal tillers without deteriorating the mother crop yield, and to compare the performance of clonal tillers with nursery seedlings at a range of planting densities. Four experiments were conducted. The first study was aimed at finding out clonal tillers and evaluating the performance of mother Crop under different intensity of tiller removals and management practices. Rice was grown with three nitrogen (N) levels, two light intensities and five intensities of tiller separation in split-Split plot design. In the second experiment, separated tillers were tested together with nursery seedlings. The third experiment where tiller production were studied under different dates of planting and varieties. Those separated tillers were tested for their performance at different densities in the fourth experiment. Application of 75 kg N/ha produced higher number of tillers/hill and similar grain yield compared to no nitrogen application. The 50% reduction of light intensity reduced tiller production by 45.6% at its maximum tillering stage, and grain yield by 43.4%. Planting date variations had no influence on total tiller production. Early transplanting (July 15) of mother crop showed higher grain yield (3.8 Uha). The photoperiod—insensitive variety RD23 produced higher number of tillers and grain yields compared to photoperiod- sensitive variety KDML105. Separation up to 4 tillers/hill did not have any adverse effect On tiller production as Well as grain yield but separation of 6 and 8 tillers/hill reduced grain yield. Variation of nitrogen had no influence on growth duration but shaded light and separation of more than 4 tillers hill extended the duration. Varietal differences in tiller production were observed. Vegetative tillers of RD23 transplanted on August [5 showed higher number of tillers and grain yield compared to KDMLIOS and late planting (September 14). Nursery seedlings gave higher number of tillers but lower grain yield compared to vegetative tillers. Increasing plant density (1 to 4/hill) reduced tiller production per plant, but higher tiller number per hill. Two to four vegetative tillers per hill showed higher grain yield than single clonal tiller/hill. Early transplanting (August 15) of vegetative tillers, use of photoperiod-insensitive variety and use of nursery seedlings extended crop duration. The results suggest that vegetative propagation using clonal tillers separated from the previously established transplanted crop is beneficial for restoration of a damaged crop of rice. Separation of four vegetative tillers/hill helped maintaining the grain yield of the mother crop and double area can be transplanted with two clonal tillers/hill. TranSplanting of two clonal tillers/hill showed no difference in grain yield when compared to usual transplanted crops using nursery seedlings. |
| Year | 2001 |
| Corresponding Series Added Entry | Asian Institute of Technology. Dissertation ; no. AS-01-07 |
| Type | Dissertation |
| 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) | Salikhe, V. M.; |
| Examination Committee(s) | Athapol Noomhorm;Ranamukhaarachchi, S. L.; |
| Scholarship Donor(s) | Government of Bangladesh (ARMP, IDA Credit No. 2815 BD); |
| Degree | Thesis (Ph.D.) - Asian Institute of Technology |