Water Requirements and Techniques for Pecan Trees
If you don't do anything else 'by the book' when it comes to caring for your pecan trees, water...water...water.
I will be the first to tell you that it's ok to under-fertilize, to miss a zinc application, to let insects get a little out of hand, but I will not give you my 'thumbs up' when you decide not to water your trees properly. If you water as you should, and do nothing else to your trees the entire growing season, chances are good that you will produce an acceptable pecan crop.
To calculate the amount of water needed, various factors need to be taken into account. Naturally, the size of your tree(s) plays a factor. The time of year, of course, must be considered. The type of soil your tree(s) are planted in. It's a no-brainer that smaller, younger pecan trees will require less water than mature trees, however, do not underestimate their water requirements. A mature tree has an extensive root system to harvest moisture from a substantial area while a young tree's roots may only spread two or three feet from the trunk.
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Whether you are contemplating planting a pecan orchard or purchasing an existing one, water availability should be a major factor in your decision. A pecan orchard must have an unlimited source of water if it is to survive AND..you must make a commitment to see to it your trees receive the amount of water they will need to produce a sufficient crop of pecans.