Week 5: Water

I was asked last week to turn this graph the other way round. Zero on the y-axis is at the top now (very wet) with 100 kPa at the bottom (dry). We were starting to get a bit dry (line falling) over the last week. This was intentional - I did not want to wash nitrate out of the soil, and I did not need to flush salt out. Last week I decided it was time for a big irrigation to fully rewet the soil to at least 40 cm. This gives me a water sample from both the 20 and 40 cm depth detectors.