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["Topgun" <aatopgunaa@mindspring.com>]

I worked with zinc and zinc sulphate on pecans for 25 years. We recommended 5 lbs of zinc sulphate for pecan trees 20 yrs old or older on sandy soils and 10 lbs per tree on clay solis. On younger pecan trees, 1/4 th lb per inch of trunk diameter. This does not work on alkaline soils however. The zinc and calcium react forming zinc carbonate which is insoluble. A little bit in a compost pile should be plenty as stated in a previous post.

 

                                                                R. D. O'Barr

                                                                Zone 7

----- Original Message -----

From: Lucky Pittman

To: North American Fruit Explorers

Sent: Monday, February 28, 2005 9:00 AM

Subject: Re: [NAFEX] Zinc deficiency in humans and trees

The latest issue of the annual proceedings of the NNGA(2003, I think
- don't have it here at the office with me) has an article by Dr. Darrell
Sparks, based on correspondence with L.D. Romberg, regarding cultivation
practices and their effect on zinc deficiency in pecans(pecan rosette
disease).  It seems that soil cultivation, destroying the sod/thatch
layer results in loss of Zn due to leaching, whereas established sod
& decomposing sod residue tends to trap(chelate?) Zn, and make it
more readily available for feeder roots of pecans - hence, native pecans
often bore more heavily, and had less rosette disease than did trees in
plantations, that were intercropped.

Lucky Pittman
USDA Cold Zone 6
AHS Heat Zone 7
Hopkinsville, KY
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