Photo of the week: soil P levels under good turf and under poor turf

A golf course superintendent noticed that the putting greens had some turf that was performing well, and that there were areas of turf on the greens that were weak. He had not applied any phosphorus (P) fertilizer and was wondering if the cause of the weak turf may be a P deficiency. Soil samples were collected to a 5 cm depth from three greens, with two samples collected from each of those greens. One sample was collected from a good…