The effect of 4000 mg zinc oxide (ZnO, 99 percent, 30 nm) nanoparticle on the physicochemical and microbiological properties of modified organic manure ultisol and loam soil cultivated using standard methods with Arachis hypogaea was assessed. The findings suggest different effects in relation to the soil type on the physicochemical properties. The pH of the control loam ultisol was 7.85 ± 0.17 and 8.3 ± 0.12 in the modified ultisol, while the control loam was 7.15 ± 0.17 and 7.41 ± 0.11 in the modified soil, respectively, suggesting a disparity of 1.06 and 1.04 times greater than the controls. At 57.82 ± 0.54 percent, 50.81 ± 0.22 percent and 55.97 ± 0.04 percent, the phosphorus concentration was 1.14 times lower in the modified ZnO ultisol and 1.07 times higher in the modified loam soil compared to the respective controls at 59.97 ± 0.02 percent. The control and modified ultisol organic matter content was 2.28 ± 0.32 percent and 0.91 ± 0.02 percent, 3.68 ± 0.36 percent and 0.36 ± 0.02 percent in the control and modified loam soil. The nitrate concentration in the control ultisol in the changed soil was 0.05 ± 0.01 percent and 0.03 ± 0.01 percent. Compared to 0.02 ± 0.01 percent in the treated soil, the nitrate in the control loam soil was 0.08 ± 0.01 percent and these variations were significant at p = 0.05. The concentration of nutritional salts was reduced and iron, copper, exchangeable acids, exchange ability, clay and silt in the changed soils increased in comparison. In addition, heterotrophic ammonia and nitrate-oxidizing bacterial populations were inhibited and denitrifying organisms were stimulated in the changed soils. The Pseudomonas, Xanthobacter, Enterobacter, Bacillus, Lactobacillus, Citrobacter, Nitrosomonas, Agromyces and Rhizobium genera were members of the organisms. The physicochemical properties of the soil were modified by ZnO nanoparticles, which exacerbated the negative impact on microbial abundance and varied with the form of soil.
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