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Mill Creek Farms, a 52-acre rabbiteye blueberry field 6 miles west of Nacogdoches, Texas, represents a unique case history in terms of plant response to a nutrition and irrigation strategy. Since establishment in 1988, the field has received daily drip irrigation during the growing season (April through September) with nutrients delivered at each watering. Soil conductivity, pH, and nutrient values have been useful in determining fertilizer sources (ammonium sulfate, urea, and 25N–9P–17K + micronutrients) and rates (5 to 10 lb of fertilizer per week depending on source). A 1986–88 survey of East Texas rabbiteye blueberry fields is used as the basis for comparison of soil, leaf tissue, and irrigation water nutrient values. A study in Summer 1995 determined soil pH, conductivity, and nutrient values at 0–6, 12–18, and 18–24 inches below the drip line at distances 0, 12, 24, and 48 inches away from the drip line. Results indicate a narrow 2- to 3-foot band of irrigation influence on soil nutrient values. In general, soil nutrient values have been lower in the root zone than recommended by “sufficiency” guidelines, yet there has been no decline in plant vigor or productivity.

EFFECTS OF A LONG-TERM BLUEBERRY FERTIGATION PROGRAM ON SOIL PH, CONDUCTIVITY, AND NUTRIENT LEVELS