EFFECTS OF TOMATO EXTRACT AND EGGSHELL POWDER ON PRE-NURSERY OIL PALM SEEDLINGS

Insan Sama Waruwu; Wismaroh Sanniwati Br. Saragih; Octanina Sari Br. Sijabat

doi:10.58432/qvhayz52

Authors

Insan Sama Waruwu Tjut Nyak Dhien University Author
Wismaroh Sanniwati Br. Saragih Tjut Nyak Dhien University Author
Octanina Sari Br. Sijabat Tjut Nyak Dhien University Author

DOI:

https://doi.org/10.58432/qvhayz52

Keywords:

eggshell powder, tomato extract, Elaeis guineensis, organic amendment, pre-nursery

Abstract

This study evaluated the individual and interactive effects of eggshell powder and tomato extract on the early growth of oil palm seedlings (Elaeis guineensis Jacq.) in the pre-nursery stage. The experiment was conducted in Medan, North Sumatra, Indonesia, from December 2025 to March 2026 using a 4 x 4 factorial randomized complete block design with three replications. Eggshell powder was applied at 0, 5, 10, and 15 g per polybag, while tomato extract was applied at 0, 10, 20, and 60 mL L-1. Plant height, stem diameter, leaf area, and leaf number were recorded from 5 to 12 weeks after planting (WAP). Data were analyzed by analysis of variance followed by Duncan's Multiple Range Test at the 5% level. Eggshell powder significantly affected stem diameter from 6 to 12 WAP and leaf area at 12 WAP; the 10 g treatment produced the greatest stem diameter (7.59 mm), whereas 15 g produced the greatest leaf area (21.62 cm2). Tomato extract significantly affected leaf number at 6 and 12 WAP, with 60 mL L-1 producing 3.56 leaves at 12 WAP. Significant interactions were detected at 12 WAP for plant height (C3T3, 22.61 cm) and stem diameter (C2T1, 8.00 mm). These results indicate that the two organic inputs influenced different components of early seedling growth and that their benefits were dose- and time-dependent.

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