In this study, compound combinations were manually added to each sample. Experiments relied on the diligence of the study team in terms of ensuring homogeneity of the compound combinations within each sample. The uniform dispersion of the compound combinations applied to each red spinach may be affected by the density of peat moss in each pod. The compaction of peat moss, or soil, may lead to poor root growth, which subsequently affects nutrient uptake. Additionally, due to inter-plant variability in the root system, the uptake of compounds may have contributed to the variability in yield.