Paclobutrazol and potassium application on tomato (lycopersicum esculentum Mill) seedlings under different waterlogged durations [manuscript]
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Date
2018
Authors
Dianne Crichelle V. Pablo
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Abstract
This study aimed to determine the effects of Paclobutrazol (PBZ) and K2O application to the growth of tomato seedlings subjected to waterlogged condition and to identify the treatment with highest percent survival and dry matter production under waterlogged condition. The experiment was conducted under screenhouse condition and was laid out using Split plot design with waterlogging duration as main plot (0-hr, 24-hr, 48 hr.) and combination of PBZ and K2O as sub plot (0 ppm PBZ + 0 g K2O, 0 ppm PBZ + 0.5 g K2O, 0 pp PBZ + 1 g K2O, 5 ppm PBZ + 0 g K2O, 5 ppm PBZ + 0.5 g K2O, 5 ppm PBZ + 1 g k2O, 10 ppm PBZ + 0 g K2O, 10 ppm PBZ + 0.5 g K2O, 10 ppm PBZ + 1 g K2O) replicated three times. Plant were planted in seedling tray and were subjected to different durations of waterlogging using Styfoam box. Data were gathered from the day of waterlogging imposition (DAW1, 35 DAS) until 21 (DAW1) with weekly interval.
The results of the study showed that the waterlogging treatments were not able to decrease percent survival and dry matter production but increase number and length of adventitious roots. On the other hand, PBZ and K2O affected plant height, leaf chlorophyll content, number and length of adventitious roots. Specifically: in terms of plant height, across water regimes PBZ has negative effect on plant height and no effect for K20; for chlorophyll content, across water regimes, high amount of PBZ and K2O can increase leaf chlorophyll content; for number of adventitious roots, at 48-hr, PBZ increases number of adventitious roots, but K2O has no effect; and lastly, for length of adventitious roots, under waterlogged condition, high amount of PBZ increases length of adventitious root per plant. The highest percent survival and dry matter production under waterlogged condition was observed in Treatment with 10 ppm PBZ + 1 g K2O.