Effect of the Combined Application of Compost with the Spraying of Some Nano Fertilizers on the Performance of Mango

The overuse of chemical fertilizers can harm soil decomposition organisms, decrease mycorrhizal colonization, and suppress nitrogen fixation through excessive nitrogen application. It is also expensive and contributes to environmental degradation, ecosystem instability, and the accumulation of heavy metals in soils and crops. Therefore, it is important to the resurgence to apply organic fertilization and nano fertilizers to lessen the reliance on the utilization of chemical fertilizers, produce healthy products, improve fruit quality, maintain soil fertility and microbial biomass, and consequently improve soil fertility and fruit productivity. In the current study, organic compost was added to the soil at 0, 2, and 3 kg/tree singly and in combination with the spraying of nanoparticles from boron and zinc at 50, 100, and 150 mg/L and nano potassium (K) at 100, 200, and 300 mg/L. The results showed that the addition of 3 kg compost to the soil combined with 150 mg/L ZnO + 150 mg/L B₂O₃ + 300 mg/L K₂O (T12), or 100 mg/L ZnO + 100 mg/L B₂O₃ + 200 mg/L K₂O (T11), and the addition of 2 kg soil combined with 150 mg/L ZnO + 150 mg/L B₂O₃ + 300 mg/L K₂O (T8) and with 100 mg/L ZnO + 100 mg/L B₂O₃ + 200 mg/L K₂O (T7) greatly improved the vegetative growth, yield, fruit quality, soil fertility, and nutritional status of the trees compared to the other applied treatments, and the addition of 3 kg compost to the soil combined with 150 mg/L ZnO + 150 mg/L B₂O₃ + 300 mg/L K₂O (T12) was the superior formula in the two seasons.