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Archive for July, 2013

Just a quick one – firstly, observations in my own garden last weekend.  Wherever there was a layer of organic matter over the ground there was bone dry soil underneath nice wet organic matter.  Not much point in that being wet though when the  soil which is where the roots are! Now, I don’t mulch as a general rule, so I’m talking whatever lands there from trees around the place, and breaks down over time.  Fine textured organic matter.   Conversely, wherever there was soil only and no layer on top, the rain of the past week or so had wetted the soil up to a depth of a few inches. 

I also received some progress reports on the mulch work done at Murdoch TAFE over the last summer.  They quite definitely show that coarse mulch is the way to go and no more than 50 mm thick if you still want soil to be wetted in the root zone (bear in mind that work was in summer with supplemental irrigation).

We are doing some work outside of Perth (north by a few hours actually) in some quite clayey soils with a range of soil moisture monitoring gear.  We’re getting quite high moisture levels in the soil but the shape of the graphs and the way the probes react to irrigations are telling us that much of that water is not plant available, the bulk of it simply sits  there making the soil feel moist but not helping the plant much at all!

And in case you haven’t been tracking rainfall and you have just been blindly following the watering days regime, perhaps you wouldn’t like to know that in May I had 210 mm rain at home compared to 21 mm in June.  So if you didn’t water in June  as per instructions, you may be in some degree of trouble especially if you’re growing things with shallower root systems eg veges or if you have new plantings in the garden.

 

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