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Say Goodbye to Pests and Pesticides: Exploring the Effects of Potassium Soil Levels on Druse Crystal Idioblasts Containing Calcium Oxalate Crystals in Spinacia oleracea

ISEF · 2026 Plant Sciences

Mukassabi, Khadeja · Southeastern Regional Vocational Technical High School

Overview

Pests are a serious problem as they cause drastic negative impacts on global food production. The current solution, using pesticides, causes even bigger issues: having detrimental impacts on the environment, human health, and the economy. Druse crystal idioblasts are specialized cells that create calcium oxalate crystals, which have been shown to deter pests away from plants. This study sought to answer the question of how changes in potassium concentration increase the formation of druse crystal idioblasts in spinach plants, supplying farmers with a novel pesticide-free solution for pest defense. Spinach plants were grown in a greenhouse and watered via a modified hydroponic system. Five potassium treatments were tested (0, 60, 120, 180, and 300 mg/L: 0 mg/L being the control group). After 43 days, spinach leaves were selected for idioblast density analysis. ANOVA test results indicated that potassium concentration impacted druse crystal idioblast density. Tukey HSD test results showed druse crystal idioblast density remains consistent among lower potassium levels (0-60 mg/L), plummets at 120 mg/L, peaks at 180 mg/L, and slightly decreases at 300 mg/L. Growth charts indicated no significant change in growth across treatment groups. The results show 180 mg/L is the optimal potassium level for maximum druse crystal idioblast density in spinach plants. Spinach farmers who want to minimize crop loss from pests, without relying on pesticides, should ensure soil potassium level is 180 ppm. Further research can replicate this study on high-yielding crops.

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Source: Regeneron International Science and Engineering Fair

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