Effect of Foliar Spray by Different Zinc Oxide Nanoparticles  Concentrations at Various Growth Stages on Grain Yield and its Components of Maize

Applications of metal oxide nanoparticles in the agriculture sector are being extensively included as the materials are considered superior. In the present work, zinc oxide nanoparticle (ZnO NPs), with a developing fertilizer, is applied in the fortification of rice grain yield and nutrient uptake enhancement. To evaluate the role of ZnO NP, two field experiments were conducted during the 2018 and 2019 seasons. ZnO NPs were small, nearly spherical, and their sizes equal to 31.4 nm, as proved via the dynamic light scattering technique. ZnO NPs were applied as a fertilizer in different concentrations, varying between 20 and 60 mg/L as a foliar spray. The mixture of ZnSO4 and ZnO NP40 ameliorated yield component and nutrients (N, K, and Zn) uptake was enhanced compared to traditional ZnSO4 treatment. Nevertheless, the uptake of the phosphorous element (P) was adversely affected by the treatment of ZnO NPs. Thus, treatment via utilizing ZnO NPs as a foliar with a very small amount (40 ppm) with of basal ZnSO4 led to a good improvement in agronomic and physiological features; eventually, higher yield and nutrient-enriched rice grain were obtained.

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Alleviation of cadmium accumulation in maize (Zea mays L.) by foliar spray of zinc oxide nanoparticles and biochar to contaminated soil

Environmental Pollution ◽

10.1016/j.envpol.2019.02.031 ◽

2019 ◽

Vol 248 ◽

pp. 358-367 ◽

Cited By ~ 37

Author(s):

Muhammad Rizwan ◽

Shafaqat Ali ◽

Muhammad Zia ur Rehman ◽

Muhammad Adrees ◽

Muhammad Arshad ◽

...

Keyword(s):

Zea Mays ◽

Zinc Oxide ◽

Contaminated Soil ◽

Zinc Oxide Nanoparticles ◽

Zea Mays L ◽

Foliar Spray ◽

Cadmium Accumulation ◽

Oxide Nanoparticles

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Response of Two Sunflower Cultivars to Foliar Spray by Different Zinc Oxide Nanoparticles Concentrations

Assiut Journal of Agricultural Sciences ◽

10.21608/ajas.2019.52641 ◽

2019 ◽

Vol 50 (3) ◽

pp. 16-26

Keyword(s):

Zinc Oxide ◽

Zinc Oxide Nanoparticles ◽

Foliar Spray ◽

Oxide Nanoparticles

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Foliar Sprayed Green Zinc Oxide Nanoparticles Mitigate Drought-Induced Oxidative Stress in Tomato

Plants ◽

10.3390/plants10112400 ◽

2021 ◽

Vol 10 (11) ◽

pp. 2400

Author(s):

Manal El-Zohri ◽

Naseem A. Al-Wadaani ◽

Sameera O. Bafeel

Keyword(s):

Oxidative Stress ◽

Zinc Oxide ◽

Drought Stress ◽

Zinc Oxide Nanoparticles ◽

Foliar Spray ◽

Oxide Nanoparticles ◽

Severe Drought ◽

Zno Nps ◽

Drought Conditions ◽

Tomato Growth

This study explored the effectiveness of green zinc oxide nanoparticles (ZnO-NPs) foliar spray on tomato growth and oxidative stress relief under drought conditions. Tomato plant subjected to four water regimes (100, 75, 50, and 25% FC), and in the same while seedlings were sprayed with 25, 50, and 100 mg/L green ZnO-NPs. The results showed that tomato growth parameters reduced significantly by increasing drought stress levels, while ZnO-NPs enhanced plant growth under all studied drought levels. Out of three ZnO-NPs concentrations tested, 25 and 50 mg/L ZnO-NPs proved to be the optimum treatments for alleviating drought stress. They increased shoot and root biomass compared to untreated controls. Application of 25 and 50 mg/L ZnO-NPs enhanced shoot dry weight by about 2–2.5-fold, respectively, under severe drought conditions (25%) compared to ZnO-NPs untreated plants. The application of 25 and 50 mg/L green ZnO-NPs decreased the drought-induced oxidative stress as indicated by the reduction in malondialdehyde and hydrogen peroxide concentrations compared to untreated controls. While 100 mg/L ZnO-NPs further increased oxidative stress. The beneficial effects of ZnO-NPs were evident in the plants’ defensive state, in which the concentration of ascorbic acid, free phenols, and the activity of superoxide dismutase, catalase, and ascorbate peroxidase were maintained at higher levels compared to NPs-untreated plants. At severe drought conditions, 25 mg/L ZnO-NPs induced SOD, CAT, and APX activity by about 3.99-, 3.23-, and 2.82-fold of their corresponding controls, respectively. Likewise, at 25% FC, SOD, CAT, and APX activity increased with 50 mg/L ZnO-NPs by about 4.58-, 3.57-, and 3.25-fold consecutively compared with their respective controls. Therefore, foliar use of green ZnO-NPs at lower concentrations might be suggested as an efficient way for enhancing tomato tolerance to drought stress.

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