If you buy a product with N in the nitrate form you are wasting money and since nitrate will leach you may add nitrate to the environment. In my opinion, these high cost products offer no biological advantages to lower cost products with similar analyses. The word on the street is that red shoot disease has made an appearance at several marshes and in various cultivars. Red shoot is a disease of cranberry caused by a fungus in the genus Exobasidium. Affected shoots are spindly with red or yellow leaves that are slightly rounder than typical oval-shaped cranberry leaves.
Diseased shoots occur singly or as a cluster arising from a node on a buried runner.
Red shoot has been reported from all major cranberry-growing regions, but it generally has not been economically important and does not call for fungicide use. There is a full-color fact sheet on red shoot. Give me a call if you want one. When red shoot showed up in 1997, some growers thought it was a weed and wanted to kill it with an herbicide. Some of the confusion is because you can easily pull the affected red shoots out of the ground, and they appear to have their own root system.