Work

Coordinated water-nitrogen management reduces ammonia volatilization and CO2 emissions while enhancing carbon sequestration, yield, and nitrogen use efficiency in peanut cropping systems

Year: 2026

Type: article

Abstract: Traditional water-nitrogen models cause high nitrogen loss, carbon emissions, and low efficiency. To balance peanut yield, efficiency, and carbon reduction, a two-year split-plot field experiment was conducted with "Nonghua 9". Main plots were full irrigation (W0) and regulated deficit irrigation (W1); subplots were four nitrogen (N) rates (0–150 kg·hm -2 ). Ammonia volatilization (AV), C/N accumulation and transformation, carbon balance, N use efficiency, and yield were evaluated across the treatments. The results showed that cumulative AV peaked on day 3 post-fertilization and correlated positively with N rate. W1 reduced AV loss at equivalent N levels. W1 combined with 100 kg·hm -2 nitrogen application (W1N2) significantly increased carbon and nitrogen concentrations in leaves and stems and promoted the translocation of carbon and nitrogen to pods. The leaf and stem C/N ratios remained optimal (16.18 to 32.18 and 13.11 to 31.77). The nitrogen nutrition index (NNI) of the W1N2 treatment remained close to 1 throughout the growth, indicating balanced N supply. Soil CO 2 emission flux peaked at flowering stage. W1 reduced the average and cumulative CO 2 emissions across stages, whereas higher N rates increased emissions. All treatments acted as carbon sinks, with W1N2 achieving the highest net ecosystem productivity (C NEP ; 140.3%-154.3% higher than W0N0). and maximum yields (5850.08-5930.88 kg·hm -2 ), along with superior agronomic nitrogen use efficiency, pod nitrogen uptake efficiency, and apparent recovery efficiency were significantly. In conclusion, W1N2 provides a feasible water-nitrogen strategy for green and low-carbon peanut production in drylands.

Source: Environmental Technology & Innovation

DOI: 10.1016/j.eti.2026.105077