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The irrigators

(Click to enlarge photo)

A close-up of the irrigators. Two lines of 25mm water-pipe across the field get the water to within 36 feet of each tree, then copper brake pipe cut into short lengths fits into a slightly smaller hole drilled in the water pipes. After that, 4mm PVC electric cable earth sheathing (the cheapest suitable pipe I could find) takes the water along each row and, finally, 2mm electric sheathing takes the water about 18 inches up each tree protector. It is important that the end is visible so you can see at a glance if the irrigation system is working at any particular tree. You can use commercial irrigation systems, of course, but expect to pay about 10 times the price! I planted my trees 4 feet apart within the rows where the rows were at 90 degrees to the southern sun and then 8 feet between each row.