Darrell Sparks and Jerry A. Sparks Archives - Pecan South MagazinePecan South magazine | The pecan industry's leading publication, published monthly for pecan producers, processors and all others involved or interested in the pecan industry.

X-axis shows the zinc in a pecan leaflet by parts per million; the y-axis shows the percentage of trees with visible zinc deficiency. The majority of trees plotted with a zinc leaflet level below 50 ppm exhibit visible symptoms of a deficiency. The points representing trees with levels of 50 and higher sit around 0% with visible zinc deficiency.

by Darrell Sparks and Jerry A. Sparks Western Front

Pecan Zinc Deficiency Linked to Leaflets’ Zinc Levels

LEAFLET ANALYSIS is widely used by pecan growers to determine the Zn (zinc) status of their pecan trees. In most diagnostic laboratories, the zinc concentration of the leaflet of 50 to 100 or 60 to 100 parts per million zinc is considered sufficient. 1,4,10 Pecan trees with less than 20 ppm Zn in the leaflets...