Prices paid to farmers for their produce fell more than 16% in the 12 months to last November, according to the latest figures from the Central Statistics Office.
During the same period, farmers' input costs fell by just under 16%.
For much of 2023, the returns to farmers for their produce diminished compared with the previous year's highs.
Overall the value of farm output fell by 16.3% in the year to November 2023 but some sectors were worst affected than others.
Dairy farmers saw prices for their output fall by 37% while cereal farmers experienced a drop of 32%. Conversely output prices improved for potatoes, rising by 63%, while vegetables prices increased by 17.7% and poultry prices rose by 3.1%.
As overall output prices fell, so too did the input costs facing farmers, down 15.7% in the same period. According to the CSO, prices for fertiliser were down 47%, feed was down 12.1% and energy was down 11.5% last year.