Alfia, Umi (2026) Pengaruh Konsentrasi ZPT Paclobutrazol Dan Dosis Pupuk Urea Terhadap Pertumbuhan Dan Hasil Tanaman Jagung (Zea mays L.) Varietas BISI 18. Undergraduate thesis, UPN Veteran Jawa Timur.
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Abstract
Maize (Zea mays L.) is an important commodity in Indonesia that requires increased productivity. Tall hybrid maize is prone to lodging; therefore, paclobutrazol has the potential to suppress excessive vegetative growth, while nitrogen plays a crucial role in supporting plant growth and yield. This study aimed to determine the optimal paclobutrazol concentration and urea fertilizer dosage for the growth and yield of BISI 18 maize. The experiment was arranged in a split plot design with two factors: paclobutrazol concentration (0, 1250, 1500, and 1750 ppm) and urea fertilizer dosage (350, 400, 450, and 500 kg ha⁻¹). Paclobutrazol was applied foliarly at 18 and 37 days after planting (DAP), while urea fertilizer was applied three times at 14, 35, and 49 DAP using the band placement method. Data were analyzed using analysis of variance (ANOVA), followed by the HSD test at the 5% level. The results showed a significant interaction between paclobutrazol concentration and urea dosage, with different optimal treatment combinations for each parameter. The combination of 1750 ppm paclobutrazol + 350 kg ha⁻¹ urea produced the shortest plants, 1750 ppm paclobutrazol + 450 kg ha⁻¹ urea resulted in the highest number of leaves, while 1250 ppm paclobutrazol + 500 kg ha⁻¹ urea accelerated tassel emergence. A urea dosage of 450 kg ha⁻¹ produced the highest kernel weight per sample and per plot and increased dry kernel yield to 10.69 t ha⁻¹. This study confirms that increasing paclobutrazol concentration suppresses plant height; however, excessively high concentrations and dosages may inhibit growth, as paclobutrazol concentrations of 1250–1500 ppm combined with a urea dosage of 450 kg ha⁻¹ were sufficient to produce the best results.
| Item Type: | Thesis (Undergraduate) | ||||||||||||
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| Subjects: | S Agriculture > S Agriculture (General) > S631-667 Fertilizers and Improvement of the soil | ||||||||||||
| Divisions: | Faculty of Agriculture > Departement of Agritechnology | ||||||||||||
| Depositing User: | Umi Alfia | ||||||||||||
| Date Deposited: | 20 Feb 2026 06:52 | ||||||||||||
| Last Modified: | 20 Feb 2026 08:35 | ||||||||||||
| URI: | https://repository.upnjatim.ac.id/id/eprint/49604 |
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