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(a–d) Effects of foliar application of kaolin and SiO2 NPs on (a) nitrogen (N), (b) phosphorous (P), (c) potassium (K), and (d) silicon (Si) of maize grown under different available water conditions (100%, 80%, and 60% AW). Fisher’s multiple range test indicates significant differences between means in each bar (p < 0.05). ** and *** indicate differences at p < 0.05 and p < 0.01 probability levels, respectively.
