Less intensive tillage reduced nitrous oxide emissions by 37–48% in grain systems moving towards organic production, Fertilizer Daily reported, citing a three-year field study. Published in the 15 October 2026 issue of Agriculture, Ecosystems & Environment, the research examined soybean-wheat-corn rotations with different combinations of cultivation, cover crops and poultry litter applications.
The systems identified in the paper as SYS and ECS recorded emissions 37% and 48% below those of the more intensively tilled MYS system, respectively. Researchers attributed the differences mainly to tillage intensity. Cultivation has several functions in organic farming, including terminating cover crops, incorporating manure and plant residues, and controlling weeds, making changes to those practices an important management consideration.
Corn had the largest annual emissions, at 11.2 kg N₂O-N per hectare. Full-season soybean followed at 4.8 kg, while wheat and double-crop soybean recorded 1.3 kg and 0.9 kg respectively. Average annual emissions across crop phases and management systems were approximately 5 kg N₂O-N per hectare. According to Fertilizer Daily, the study’s authors regarded that average as evidence of heightened emissions risk during the transition to organic production.
The outlet noted that avoiding synthetic fertilizer does not eliminate the climate risks associated with nitrogen inputs. Manure and legumes can also contribute to substantial nitrous oxide emissions when incorporated through ploughing. Earlier Penn State research cited in the report found that corn accounted for 80% of emissions in organic corn-soybean-winter grain rotations, averaging 9.8 kg N₂O-N per hectare. That work linked emissions peaks to rapid soil oxygen depletion after manure and cover crop residues were buried together.
Fertilizer Daily highlighted separating manure applications from newly incorporated legume residues, reducing cultivation passes and aligning organic nitrogen supply with corn uptake as potential ways to limit losses. It also drew a parallel with urea and UAN use in conventional farming, where nitrogen not absorbed by crops remains vulnerable to denitrification.
The findings cover only one three-year rotation during the transition to organic certification, when soil nitrogen processes are changing. The study’s published highlights did not provide yield trade-offs associated with reduced tillage. Longer trials are therefore needed to establish whether lower-emission organic corn systems can maintain yields while managing weeds with less cultivation.