Abstract
The current study aimed to study the effect of foliar application of nano-NPK fertilizer to one-year-old Fig trees (cv. Black Mission) in terms of tree growth performance as well as on soil microbial activity. The investigated concentrations of nano-NPK were 100, 200, 300, 400 and 500 ppm in addition to the control treatment applied for two seasons. The obtained results for both seasons indicated that all concentrations of nano-fertilizers significantly improved parameters of vegetative growth and soil health compared to the control group. However, the highest values for leaf wet and dry weight, leaf area, and leaf water content were recorded as a result of foliar fertilization at a concentration of 300 ppm. While 400 and 500 ppm nano-NPK gave the highest values for the contents of N, P, K, Ca, Mg and chlorophyll in the leaves. On the other hand, the highest bacterial activity was found in Fig’s rhizosp here subjected to foliar application with nano-NPK at concentrations of 300, 400 and 500 ppm. In addition, the highest POX and PPO isozyme activities were scored in 200 and 300 ppm. In general, foliar fertilization with nano-NPK can be recommended as it enhances vegetative growth, leaf chlorophyll and mineral contents without negative impact on soil microbial activity.
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