Sparks, Zinc deficiency, figure 1

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.

Figure 1. Relationship between percentage of pecan trees with zinc deficiency symptoms and parts per million zinc in the leaflet. The vertical broken line represents the lower limit (50 ppm) of the zinc sufficiency range. Each point is based on 14 trees. Based on an experiment with 10 differential zinc treatments over a six-year period.