Wednesday, January 27, 2010

Week 5: Nitrate

Last week I put on the equivalent of 10 kg of nitrogen fertiliser per hectare. The nitrate in the 20 cm detector shot up from 21 ppm to 264 ppm, but this week dropped down to 68 ppm. I do not know how much of this nitrate went up into the plant (probably most of it) or down into the lower soil layers. It was a big irrigation this week and we collected a water sample in the 40 cm depth detector. Plenty of nitrate there - over 300 ppm.

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