Wednesday, February 3, 2010

Week 6: Irrigation

The fourth week with no rain. Last week the total potential water use was calculated at 43 mm by the Canberra City meteoroligical station. I applied 22 mm of irrigation, so that gives me an 'irrigation ratio' of about 0.5. The crop is close to full canopy now, so could probably have used the full 43 mm. I under-irrigated on purpose because I want the crop to use water deeper in the soil. I know there is water at depth and I know there is nitrate a depth and I also know the crop is at a stage where a bit of water stress will not hurt too much. Moreover the bureau are forecasting rain, but I'm not sure I believe it anymore.

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