Theses and Dissertations

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Browsing Theses and Dissertations by Adviser "CELYNNE O. PADILLA, M.Sc."

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    Competitive ability of different density levels of swamp cabbage (Ipomea aquatic L.) with transplanted rice (Oryza sativa L.) [manuscript]
    (2020) Mariel V. Macapulay
    The study was conducted to determine the competitive ability of Ipomea aquatic at different density levels (3, 6, 9, and 12) and to determine the yield loss of rice due to infestation of the weed. Black plastic basin was used in the experiment measuring 18 cm in depth and 186 cm2 area filled with 14 kg of sterilized soil. It was consisted of five treatments with four replications using Randomized Complete Block Design. Data were statistically analyzed and treatment means were compared using Leaf Significant Difference (LSD) at 5% level of significance. The results of the study revealed that at different density levels of Ipomea aquatic which allowed to compete with rice showed no significant effects in terms of plant height, number of leaves, panicles, fresh weight and dry weight. However, number of rice tillers per plant were significantly reduced in treatments 3 (6.80), 9 (6.80) and 12 (5.80) densities of I aquatic as compared to rice plant alone (density). Percent yield loss was also determined and it was observed that the presence of I aquatic produced yield loss from 21.80% up to 33.69%.
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    Responses of different fragments of lowland ecotype Cyperus rotundus L.) to early and late flooding [manuscript]
    (2019) Raymart John C. Queliza
    C. rotundus L. is one of the most dominant weeds in many field and vegetable crops due to its unique biological and physiological properties. Mainly, C. rotundus thrives well under upland condition however some report say C. rotundus able to adapt such flooded condition. An experiment was conducted from March to June 2019 at the screen house of Crop Protection Division, Philippine Rice Research Institute, Maligaya, Science City of Muñoz, Nueva Ecija to (a) determine the responses of different fragments of Lowland ecotype C. rotundus on early and late flooding and (b) determined the best timing of flooding that can inhibit the growth and succession of lowland ecotype C. rotundus. Tubers of lowland ecotype were collected from Aliaga Nueva Ecija. Collected tubers were cut into fragments (B1-whole tuber, B2-1/2 tuber, B3-1/3 tuber, B4- 1/4 tuber) then pre-germinate to Philippine Rice Research Institute, Maligaya, Science City of Muñoz, Nueva Ecija. The experiment was establish following a two-way factorial Randomized Complete Block Design with 3 replications having early and late flooding. Growth parameters of C. rotundus were gathered and analyzed through analysis of variance using STAR 2013. Results showed that the main effect of flooding significantly affected the growth and development of C. rotundus. Early flooding showed suppression effect than late flooding. All fragments did not produced shoots when flooded all throughout from 0 to 50 DAP while all fragments can produced under saturated condition. The results of this study proved that the early the flooding is given, succession of C. rotundus will lessen.