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Old 12-05-2006, 05:20 PM   #8 (permalink)
JoeReal
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Location: Davis, California USDA zone 9
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Default Re: 50-n-1 citrus tree partially loaded with fruits!!!

Automatic irrigation. I readjust ever 2 weeks by pressing two buttons only (up and down to adjust %). I prepared a chart indicating how many % of maximum setting in summer demand do I need to adjust depending on each 2 week period, readjusted by looking at forecast and past week's data. 2nd half of June is our highest evapotranspiration demand, so everything is scaled down from the amount of water delivered. Then I simply set the % irrigation down from there. But if it would be hotter than average the past week, then I readjust slightly. If it has rained or going to rain, I consider that too. That way, I don't have lots of excess water, only what's needed by the plants plus a little bit of drainage to prevent salt accumulation.

For example:
% Setting
Month, 1st half, 2nd Half, Monthly
Jan 10% 14% 12%
Feb 17% 24% 20%
Mar 27% 42% 36%
Apr 51% 65% 57%
May 74% 85% 81%
Jun 93% 100% 96%
Jul 97% 92% 94%
Aug 88% 79% 83%
Sep 78% 61% 69%
Oct 51% 40% 49%
Nov 27% 20% 27%
Dec 14% 11% 13%

I start irrigation in April and turn off in December.
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