UNDERGRADUATE

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Browsing UNDERGRADUATE by Adviser "ACE MUGSSY L. AGUSTIN"

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    Growth and dry matter partitioning of tomato (Lycopersicum esculentum Mill.) applied with potassium nitrate and Paclobutrazol under waterlogged condition / [manuscript]
    (2017) James D. Letche
    The general objective of this study was to evaluate the effects of exogenous application of paclobutrazol (PBZ) and potassium nitrate (KNO3) in tomato subjected to different water regimes. Specifically, it aimed to determine the response of tomato under different water regimes as affected by application of PBZ and KNO3 and identify the optimum concentration of PBZ and KNO3 that will give highest survival of tomato in different water regimes. the treatments were: water regime as main plots (non-waterlogged, 24 hrs, and 48 hrs waterlogged) and combination of PBZ (0, 250, 500 ppm) and KNO3 (0%, 4%, 8%) as sub-plot. Treatments were arranged in split plot in RCBD. Waterlogging caused reduction in % survival of tomato; however there was no further decrease from 24 hrs to 48 hrs waterlogging. this trend was similar to plant height, number of leaves, leaf dry weight, stem dry weight, plant dry weight and days to flowering. In terms of PGRd, across WR, highest concentration of PBZ w/o KNO3 (0% KNO3 + 500 ppm PBZ) had highest % survival. However, when 500 pppm PBZ combined with 4% and 8% KNO3 there was reduction in % survival. This was also observed in number of adventitious roots wherein 8% KNO3 + 500 ppm PBZ, had the lowest number of adventitious roots. Plants treated with PBZ and KNO3 were able to maintain partitioning coefficient in stem when subjected to waterlogged condiction. Furthermore, there was decreasing trend in % survival at increasing KNO3 in different water regimes.
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    Rainfed performance of different rice ecotypes applied with Paclobutrazol [manuscript]
    (2018) Meliza P. Magtalas
    This study aimed to evaluate the effect of paclobutrazol (PBZ) in agronomic parameters of different rice ecotypes under rainfed condition, identify appropriate PBZ concentration for each ecotype, and identify combination of PBZ and rice ecotype with highest grain yield. The experiment was laid out in split-plot design with PBZ concentrations (0, 250, 500 ppm) as main plot applied at 14 days after transplanting while rice ecotypes (rainfed lowland-PSB Rc14; irrigated lowland-NSIC Rc222; upland special quality- Dinorado and lowland special quality- NSIC Rc216) as sub plot arranged in RCBD with three replications. Water was drained 14 DAT and there was no standing water until harvest time. Peizometer reading at 14 DAT until harvest showed soil moisture at 44 - 66 cm below soil surface and soil moisture content at 18%. Results showed that PBZ application at tillering stage has short term (21 days) effect of shorter plant height compared to untreated plant (0 PBZ), no effect in leaf chlorophyll content, and long term (14-49 DAT) effect in increasing tiller number which contributed to higher panicle number. PBZ also improved other yield components such as panicle length, number and percentage of filled grains, biomass and grain yield. PBZ concentrations and rice ecotypes for grain yield showed significant interaction incidcating appropriate PBZ concentration varies with rice ecotype. Lower PBZ concentration (250 ppm) gave highest grain yield for PSB Rc14 (4.50 t ha-1_ and NSIC Rc222 (7.75 t ha-1) while higher concentration (500 ppm) for Dinorado (5.76 t ha-1) and NSIC Rc216 (6.78 t ha-1). Over all, highest productivity under rainfed condition was obtained from NSIC Rc222 (7.75 t ha-1) with 250 ppm PBZ.
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    Yield of white corn (Zea mays L.) supplemented with different rates of rice hull biochar during wet season [manuscript]
    (2017) Liezel C. Peralta
    The study was conducted to determine the growth response of white corn and therate of biochar that can provide the highest yield and evaluate the most economical combination of treatments. The treatments evaluated were T1 (Inorganic fertilizer); T2 (RHB). T3 (IF + 5.33 t ha-1 of RHB); and T7 (IF + 6.67 t ha-1 of RHB). The egronomic and yield performance of white corn in terms of number of days to tasseling, silking, maturity, plant height, ear length and diameter, number of kernel per ear and the yield were significantly increased by the supplementation of the lowest amount of biochar (1.33 t ha-1) to IF which had the best effect of all the treatments. This treatment also gave the highest yield about 3.7 t ha-1 and highest net income. On the other hand, the lowest net income (negative) and yield was obtained on the treatment that was purely applied with RHB (4 t ha-1) which was 0.14 t ha-1. This study revealed a promising result of biocahr in increasing yield and net income of corn production particularly supplementation of rice hull biochar (RHB) lower than the recommended rate (1.33 t ha-1). Hence, this amount of biochar was recommended as supplement to inorganic fertilizer to improve corn productivity during wet season.