Background: Siam Banjar orange cultivated in South Kalimantan holds significant potential to become a key fruit commodity in Indonesia. To enhance its productivity, various methods, including seedling growth manipulation through strangulation and the use of Plant Growth Regulators (PGRs) during the vegetative phase, can be employed. Strangulation aims to improve plant performance, thereby increasing productivity, while the use of PGRs aims to regulate growth and improve fruit quality during the generative phase.

Materials and Methods: This research utilized a Randomized Complete Block Design (RCBD) with two tested factors. The first factor involved double strangulation (S), with four treatment levels: S0 (control), S1 (5-5 cm height of double strangulation), S2 (5-10 cm height of double strangulation), and S3 (5-15 cm height of double strangulation). The second tested factor was the application of PGRs (Z), with three treatment levels: Z0 (control), Z1 (75 ppm BAP), and Z2 (150 ppm BAP). Each treatment was replicated four times, totaling 48 experimental units, with each experimental unit consisting of two orange seedlings.

Results: The research results showed that the effect of giving cow manure significantly differed on all growth parameters and eggplant yields.

Conclusion: The increase in doses of cow manure and NPK fertilizer showed a positive linear relationship, where the relative growth rate, plant growth rate, net assimilation rate, fruit diameter, fruit length, fruit quantity, fruit weight per plant, and fruit weight per eggplant plant also increased.

Keywords: Banjar orange, vegetative growth, plant growth regulators (PGRs), strangulation and fruit quality.