Effect of plant growth regulator (PGR) concentration on plant growth, yield and quality of sweet potato (Ipomea Batatas [L.] Lam.). Journal of Tropical Agriculture and Food Science (JTAFS), 53 (1). pp. 77-81. (2025)
Abstract
This study examined the impact of varying concentrations of indole-3-acetic acid (IAA), a plant growth regulator, on the growth, yield, and quality of sweet potato (Ipomoea batatas [L.] Lam.) under conventional soil planting. Field experiments were conducted at the MARDI Serdang using a randomised complete block design with four treatments (0, 3, 5 and 7 ppm IAA concentration) and five replications across 20 plots. Sweet potato cv. Beni Hanuka was propagated via 30-cm stem cuttings, and the application of IAA was performed as a foliar spray at 21 days after planting. Notably, the 5 ppm concentration (T3) resulted in the highest tuber yield per plot (76.5 kg) and HI (0.53), suggesting improved biomass partitioning toward the storage organs. The 5 ppm treatment enhanced TSS (12.6 °Brix) and produced the highest tuber count (6 tubers per plant) with superior tuber length compared to the other treatments. These results suggest that a moderate IAA concentration optimises both yield and quality by improving root differentiation, photosynthetic efficiency, and assimilate allocation. Overall, the study indicated that a 5 ppm IAA concentration is optimal for sweet potato cultivation, balancing the promotion of storage root development with improved physiological and yield traits.
| Item Type: | Article |
|---|---|
| Keywords: | Sweet potato, tuber, booster fertiliser, nutrient, yield |
| Taxonomy: | By Niche > Food Technology > Research & Food Product Development (R&D) > Prototype development By Niche > Food Technology > Research & Food Product Development (R&D) > Research |
| Local Content Hub: | Niche > Food Technology |
| Depositing User: | Muhammad Shafiq Amirullah |
| Date Deposited: | 10 Dec 2025 07:21 |
| Last Modified: | 10 Dec 2025 07:21 |
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