Barnyard Good for All That Grows?

With today’s interest in being organic, may folks seem to think “Barnyard Is Best”. Following is an excerpt from the July Pecan Press in which Dr. George Ray McEarchern discussed nitrogen sources for pecan orchards.

“Barnyard manure can be ruled out. In 1949 A.O Alben at the USDA Pecan Station in Shreveport learned manure from the Fort Worth Stockyards caused zinc rosette to the extent that it was discontinued. F. R. Brison called it the barnyard effect when trees failed to grow in soil containing manure. I learned pecan trees can actually die from barnyard manure at a sheep show lot in Lamesa and at a dairy feedlot in El Paso. So manure, even if it is free is not a workable source of nitrogen for pecans."