[Arid_gardener] Question from Home-Hort WWW page

[Dick]

The standard, Adam, for fertilization of Citrus as I have practiced for 40 
years is printed on each bag of 21-0-0 Ammonium Sulfate; 1/3 third of the 
yearly requirement applied in March, June and September at the drip line and 
irrigated at least 36 inches deep confirmed with a brass soil probe with a 
dull point and a 6 inch piece of an old garden handle on one end. When you 
can sink your probe in the trench 36 inches deep in several places, shut the 
water off. Don't irrigate again until the soil is quite dry at least 3 
inches deep in the trench.

Desert soils are deficient in nitrogen. Without supplemental nitrogen, the 
foliage will be a sickly yellow: Properly fed, a deep green. There may be a 
similar hue if irrigation is lacking but nitrogen is the greening agent. If 
there is an excess of nitrogen, it will usually show up as exceptionally 
thick rind.

Your local nursery specialist should be able to advise  you further.

Dick Gross, Master Gardener Volunteer
U of A Maricopa County Cooperative Extension


----- Original Message ----- 
From: <aerenstein at gmail.com>
To: <arid_gardener at Ag.arizona.edu>
Sent: Monday, February 11, 2008 7:55 PM
Subject: [Arid_gardener] Question from Home-Hort WWW page


> Adam
> 85050
> aerenstein at gmail.com
>
> I have a orange treee and the leaves are turning yellow at the tips. What 
> can I do?
>
> Also, the lemon tree sees to be turning a yellow green. Can I fertilize 
> this time of year?
>
>
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