Biological systems approach to analyzing population dynamics of rice and its reponse to major physical and biotic variables /
Two years of field experiments were conducted to evaluate the
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| Format: | Thesis Book |
| Language: | English |
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[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=739668121&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Two years of field experiments were conducted to evaluate the effect of cultivar and plant density on the growth and development of rice (Oryza sativa L.) tillers, and their contribution to grain yield. Three cultivars, Gulfmont, Rosemont, and Teqing differed significantly in their node production rate, tiller height, tillering pattern, and grain yield. Plant density significantly affected the number of tillers produced, tiller height, panicle density, number of spikelets per panicle, percentage of filled spikelets, and kernel weight. Dry matter partitioning among tiller groups was a function of plant density and a cultivar's tillering ability. Cultivars with a high tillering ability partitioned more mass to subtillers, especially at low plant densities. The compensation and competition relationships among individual tillers and yield components provided considerable stability in dry mass accumulation and grain yield. A model of rice growth and development was developed, which simulates the seasonal numbers and mass of root, culm, leaf sheath, leaf blade, panicle vegetative component, and grain, for maintiller and subtillers. The physiological detail imbedded in the model is unique in its tiller structure, and in its growth and development of each of its structural components. A statistically rigorous parameterization-verification- validation procedure was presented to quantify the model's robustness at simulating the seasonal dynamics of 13 data types obtained from two years of destructive plant sampling. The validated rice model was coupled to a rice water weevil (Lissorhoptrus oryzophilus Kuschel) feeding submodel to simulate the response of rice to weevil injury. Weevil feeding affects rice growth and development through root pruning and reduction in nitrogen uptake efficiency. The simulated results were verified and validated using four years of field data. The similarity between simulated results and field data demonstrated that the model captured the essence of rice growth and development, and its response to rice water weevil injury and management practices. |
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| Item Description: | Vita. "Major Subject: Entomology". |
| Physical Description: | xiv, 149 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 130-148. |