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The potential for N mineralization or immobilization in potting media containing compost was investigated in experiments using sunflower ( Helianthus annuus  `Sunrich Yellow') as a test crop with potting media formulated from 3 aged pine bark: 2 sphagnum peat or compost: 1 vermiculite (by volume). Cropped and uncropped media in 350-mL pots were fertilized by subirrigation with complete nutrient solutions containing N at 2, 4, 6, 8 or 12 mmol·L –1  as ammonium nitrate. In control medium without compost, sunflower fresh mass increased linearly with increasing N. In one compost medium (C), growth was stimulated and with N at 6 mmol·L –1  was equal to growth with N at 12 mmol·L –1  in the control medium. With another compost medium (A), growth was inhibited and did not respond to increasing N. In medium C, saturated media extracts (SME) obtained before and up to 12 days after transplanting had higher concentrations of NH 4  and NO 3  than the control medium. In medium A, NH 4  concentrations were similar to controls, but NO 3  concentrations were lower. Nitrite concentrations were less than 0.2 mmol·L –1  and were highest in medium C. Nitrogen derived from compost in medium C substantially reduced the soluble fertilizer N requirement for sunflowers, while N immobilization by compost in medium A was not overcome by increasing fertilizer N.

Nitrogen Mineralization and Immobilization and Plant Growth Response to Nitrogen Fertilization in Potting Media Containing Compost.