Urea
Catch crops help prevent nitrogen from leaching into waterways
20 Sep 2024
Trials on a North Canterbury dairy farm have found that early sown oats and Italian ryegrass are taking up excess urine deposited by winter grazing cows. Audio
When the chips are down
24 May 2019
Groundwater scientists are using John Saywell's Canterbury farm to measure how well buried trenches filled with woodchips and bacteria break down nitrates in drainage water. Audio, Gallery
When the chips are down
24 May 2019
Groundwater scientists are using John Saywell's Canterbury farm to measure how well buried trenches filled with woodchips and bacteria break down nitrates in drainage water.
Audio