2025 RaveendraKumaran Assessing Controlled Traffic Farming as a Precision Agriculture Strategy for Minimising N2O Losses

Intensive vegetable farming emits high nitrous oxide (N2 O) due to traffic-induced com- paction, highlighting the need for preventing nitrogen (N) losses through better traffic management. This study examined the effects of Controlled Traffic Farming (CTF) and Random Traffic Farming (RTF) on N2 O emissions using intact soil cores (diameter: 18.7 cm; depth: 25 cm) collected from a vegetable production system in Pukekohe, New Zealand. Soil cores from CTF beds, CTF tramlines, and RTF plots were analysed under fertilised (140 kg N/ha) and unfertilised conditions. N2 O fluxes were monitored over 58 days using gas chambers. The fertilised RTF system significantly (p < 0.05) increased N2 O emissions (5.4 kg N2O–N/ha) compared to the unfertilised RTF system (1.53 kg N2 O–N/ha). The emission from fertilised RTF was 46% higher than the maximum N2 O emissions (3.7 kg N2O–N/ha) reported under New Zealand pasture conditions. The fertilised CTF system showed a 31.6% reduction in N2 O emissions compared to fertilised RTF and did not differ significantly from unfertilised CTF. In general, CTF has demonstrated some resilience against fertiliser-induced N2 O emissions, indicating the need for further investigation into its role as a greenhouse gas mitigation strategy.

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