DOSE-DEPENDENT TITHONIA-EGGSHELL INTERACTIONS INFLUENCE CHERRY TOMATO YIELD UNDER DRIP IRRIGATION

Mhd Fakhri Abdullah; Dedi Kurniawan; Yunida Berliana

doi:10.58432/b58mcf46

Authors

Mhd Fakhri Abdullah Tjut Nyak Dhien University Author
Dedi Kurniawan Tjut Nyak Dhien University Author
Yunida Berliana Tjut Nyak Dhien University Author

DOI:

https://doi.org/10.58432/b58mcf46

Keywords:

cherry tomato, Tithonia diversifolia, eggshell, drip irrigation, organic fertilization

Abstract

Circular nutrient strategies that combine plant-derived fertilizers with mineral-rich food waste may reduce dependence on conventional inputs, but their interaction can be dose-sensitive. This study evaluated liquid organic fertilizer (LOF) from Tithonia diversifolia and chicken eggshell powder on cherry tomato under drip irrigation. A factorial randomized block design used four nutrient regimes (N0 = AB mix comparator; N1 = 500 ppm Tithonia LOF; N2 = 1000 ppm; N3 = 1500 ppm) and two eggshell levels (C0 = 0; C1 = 50 g plant-1), with three blocks. Plant height and stem diameter were recorded at 4-8 weeks after planting (WAP), fruit number and fruit weight were evaluated across three harvest observations, and post-treatment soil organic C, total N, and C/N ratio were measured. Tithonia regime affected plant height at 4 and 6 WAP but not stem diameter. Neither main factor affected fruit number or fruit weight; however, their interaction was significant for both yield variables. N1C0 produced the highest numerical fruit number (5.44 plant-1), whereas N0C1 produced the highest fruit weight (14.50 g plant-1); N1C1 produced the lowest fruit weight (7.52 g plant-1), revealing a crossover rather than uniformly synergistic response. Soil chemistry showed descriptive increases in organic C and total N and a decline in C/N toward N3C1. Baseline pH differed among treatment allocations and was therefore not interpreted as a treatment effect. These findings show that recycling Tithonia biomass and eggshell waste in drip-irrigated cherry tomato requires dose-specific pairing; combining organic inputs does not automatically improve yield.

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