Abstract:Taking seven-year-old Luxing nectarine as test material, and the field smearing test was carried out and the 15N isotope tracing technique was applied to explore the effects of different concentrations of nano-carbon and the same concentration of urea solution (0 μg/mL+0.2%, 50 μg/mL+0.2%, 100 μg/mL+0.2%, 200 μg/mL+0.2%, expressed as CK, NC50, NC100 and NC200, respectively) on the growth, nitrogen absorption and distribution in the spring main shoots and leaves of peach, in order to provide new ideas and useful references for the application of carbon nanometers in the cultivation of peach trees. The solution was coated with some leaves. The results showed that compared with the control, the leaf area and the chlorophyll content were significantly increased after application of nano-carbon. The net photosynthetic rate, transpiration rate and stomatal conductance of the leaves in NC200 treatment increased by 15.8%, 30.0% and 12.4% compared with the control, respectively. The application of nano-carbon promoted the dry matter accumulation of the new peach shoots. The treatments of NC100 and NC200 increased the dry matter accumulation by 10.5% and 12.9%, respectively, compared with the control, and increased the total nitrogen content of the new shoots. High concentration of nano-carbon (NC200 treatment) increased the nitrogen uptake ability of new organs (Ndff value). With the increasing of nano-carbon concentration, the nitrogen utilization efficiency increased significantly. The nitrogen utilization rate of NC50, NC100, NC200 treatments increased by 13.6%, 29.5% and 40.0%, respectively, compared with the control. In addition, the nitrogen distribution rate in new leaves of NC200 treatment was the highest, reaching 19.55%, and the nitrogen distribution rate of NC50, NC100 and NC200 treatments were 4.5%, 16.2% and 17.1% higher than that of the control, respectively, and the differences were significantly. The above results indicated that nano-carbon could promote the absorption and utilization of nitrogen in new shoot leaves, effectively improve chlorophyll content, photosynthetic efficiency and local nitrogen utilization rate of new shoots, affect the distribution of nitrogen in different parts of shoots, and promote the transfer of nitrogen to the growth centers (new tender leaves).