Influence of Zinc Oxide Nanoparticles on the Productivity, Mineral Element Accumulation, and Fruit Quality of Tomato (Solanum lycopersicum L.)

Abstract

Foliar application of zinc oxide nanoparticles (ZnO-NPs) is a promising strategy in modern agriculture. This method has shown significant potential in enhancing tomato yields, improving fruit quality, and increasing nutrient uptake. An experiment was conducted in cocopeat media under glasshouse conditions at Ladang 15, Universiti Putra Malaysia (UPM) in 2020 to evaluate the effectiveness of various doses of ZnO-NPs on plant growth, yield, nutrient uptake, and fruit quality in terms of profitability. A total of ten treatments were evaluated, consisting of five levels of ZnO-NPs (0 ppm, 25 ppm, 50 ppm, 75 ppm, and 100 ppm) and two tomato varieties (MARDI Tomato 1 and MARDI Tomato 3). The experiment utilized a split-plot design with four replications. The results indicated that the application of 100 ppm ZnO-NPs produced the maximum measures of plant growth and fruit quality, including the highest number of primary branches per plant (27.75), leaf area (27.80 cm²), photosynthetic rate (33.05 µmol/m²/s), stomatal conductance (1.01 mol/m²/s), fruit length (4.55 cm), fruit diameter (4.33 cm), number of fruits per plant (52.75), fruit yield (53.85 t/ha), ascorbic acid content (26.13 mg/100 g), zinc content in fruits (52.25 mg/kg), total zinc uptake (102.34 mg/plant), and a benefit-cost ratio of 3.39. Moreover, among the tested varieties, MT3 outperformed MT1. Therefore, a foliar application of 100 ppm ZnO-NPs is recommended as the optimal dose for tomato cultivation. This approach promotes healthier plants and superior fruit quality and supports more sustainable and productive agricultural practices while minimizing environmental harm. Additionally, further research is necessary to explore higher dosages of ZnO-NPs in tomato production to establish the best dose for optimizing output.