Abstract
It has been shown previously that treatment of grass swards cultured in waste-derived compost and treated with 8–24 g (5–15 g·L −1) glucose over 8 weeks resulted in a substantial increase of shoot dry matter and total nitrogen content, while a growth inhibiting effect was observed in unamended field soil. The improved sward performance in compost was associated with a significant expansion of the aerobic, diazotrophic bacterial population in the growth medium. The purpose of the present experiment was to measure the contribution of N 2-fixation to the improved growth. Glucose treatment resulted in the fixation of at least 128 mg total nitrogen per pot (equivalent to 14.5 mg N fixed per g C respired; 104 kg·ha −1), with 32 % made available to shoots for growth over the following 6 months. There was no evidence of accelerated soil organic matter decomposition that could account for the increased N availability.
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