This data package contains fluff grass (Erioneuron pulchellum) data from 1986-1987. The purpose of this study was to test if changing densities of soil microarthropods and nematodes results in changes in fluff grass nitrogen mineralization and biomass. Twenty plots (each 6m x 6m) with 3-meter buffers between were established on the Jornada Basin CDRCC. Four treatments were assigned to 5 plots each 1) Chlordane (to exclude microarthropods), 2) Chlordane and water, 3) Water, and 4) Control. For this portion of the study, anion exchange bags were placed in the rhizosphere of a fluffgrass in each plot. Bags were left in the field 3 months, collected, brought to the lab and analyzed for NO3 -N using a cadmium reduction procedure. This package contains date of data collection, treatment type, and NO3 mg/kg concentration. This data set is complete