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ABSTRACT<br/><br/>TABANGAY, ARIANNE JOY D. 2019. Growth and Yield Response of<br/>Rice (Oryza sativa L.) Varieties to Varying Rates of Carrageenan Plant Growth<br/>Regulator Under Rainfed Lowland Condition. Undergraduate Thesis. College of<br/>Agriculture, Food and Sustainable Development Mariano Marcos State University.<br/>City of Batac 2906 Ilocos Norte 100 pp.<br/>Adviser: Ms. Joanna P. Crosby<br/>Co-adviser: Dr. Dionisio S. Bucao<br/> <br/> A field experiment was conducted at the experimental farm of the Mariano<br/>Marcos State University (MMSU), City of Batac, Ilocos Norte, from July to November<br/>2018, to evaluate the performance of different rice varieties to varying rates of<br/>carrageenan plant growth regulator (CPGR) under rainfed lowland condition.<br/>Specifically, the study aimed to: 1) compare the growth and yield performance of<br/>different rice varieties under rainfed lowland condition; 2) determine the effect of<br/>varying rates of CPGR on the growth and yield of rice under rainfed lowland condition;<br/>3) identify the best rice variety and rate of CPGR that could give the highest yield under<br/>rainfed lowland condition, and 4) determine the profitability and productivity of rice<br/>varieties applied with CPGR at varying rates.<br/> The experiment was arranged in a Strip-plot in Randomized Complete Block<br/>Design with three replications. Three varieties were tested, PSB Rc82 (Peñaranda),<br/>NSIC Rc282 (Sahod Ulan 7) and NSIC Rc286 (Sahod Ulan 9) which were assigned as<br/>the vertical factor while the three CPGR rates (61 ba'!, 91 ha' and 12 I ha') including the untreated plants (control) were assigned as the horizontal factor. The experimental<br/>unit plot size used was 24 m. A total land area of 1129.2 m' was used in the study.<br/>Significant interaction effect between variety and CPGR rate was revealed on<br/>the growth parameters of rice including tiller count, leaf area index (LAT) and above-<br/>ground biomass (AGB). Moreover, significant interaction effect was found on percent<br/>filled grains. However, these did not result to a significant interaction effect on grain<br/>yield.<br/> The rice varieties tested significantly differ in growth performance particularly<br/>in terms of plant height, tiller count, AGB, heading and maturity. Among the varieties<br/>evaluated, NSIC Rc282 had the heaviest panicle. On the other hand, the highest yield<br/>was obtained in PSB Rc82 with 5.49 t ha' followed by NSIC Rc282 with 4.96 t ha-<br/>The growth performance of rice also differs significantly with the application of<br/>CPGR in terms of plant height, tiller count, leaf color, AGB, and heading. The yield<br/>and yield components of rice including productive tillers and panicle weight also differ<br/>significantly with CPGR application. Higher grain yield was obtained in plants applied<br/>with CPGR. Moreover, the application of 12 1 ha- CPGR produced the highest yield<br/>among the application rates.<br/> Among the varieties, PSB Rc82 and NSIC Rc282 surpassed the average yield<br/>of rainfed rice in Ilocos region at 3.78 t ha-' to 4.05 t ha- (2013-2017 period). Moreover,<br/>PSB Rc82 generated the highest net income (Php 72,690.70-Php 86,350.00) and retum<br/>on investment (ROI) with 2.01-2.30. Among the varieties, increase in net return (25.84<br/>to 45.94%) with the application of CPGR was highest in NSIC Rc282.<br/> |
