Abstract
Plant roots and microorganisms play an important role in the soil N cycle and plant N nutrition through the release of extracellular enzymes. In the present greenhouse pot experiment, wheat (Triticum aestivum) seedlings were grown in a fluvo-aquic soil (Udifluvent) to investigate N mineralization and utilization in the rhizosphere of wheat. The soil received chemical fertilizer (15N-labeled urea), chemical fertilizer plus manure (common urea + 15N-labeled swine manure) or no N. Plant roots were separated from the soil with a nylon cloth, and 1-mm increments of soil moving laterally away from roots were analyzed for N, microbial C, and the activities of invertase, urease and protease. Chemical fertilizer plus manure promoted wheat growth and N absorption significantly compared with chemical fertilizer. 15N from both chemical fertilizer and swine manure accumulated significantly in the rhizosphere soil within 5 mm of the roots. Fertilized N could thus move easily laterally towards roots and there was no indication that movement through the soil limited plant N supply. A large proportion of fertilizer N was lost from the soil during the wheat growing period, and N utilization efficiency was 24% for chemical fertilizer and 30% for swine manure. In addition, faster rates of N mineralization, larger amounts of microbial C, and increased activities of invertase, urease and protease occurred in the rhizosphere compared with other parts of the soil. There was a significant correlation between microbial C and N mineralization rate (r = 0.968, P < 0.01) in the whole soil. Microbial C also showed significant positive correlations with activities of invertase (r = 0.892, P < 0.01) and protease (r = 0.933, P < 0.01). Further study showed that adding manure into soil increased microbial C and the activities of invertase and protease; adding urea stimulated urease activity in the same soil. Changes in soil enzyme activities in response to N fertilizers could be considered indicators for different fertilizer managements.
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This research work was supported by State Key Development Program of Basic Research of China (Project 2007CB109304). We thank the anonymous reviewer very much for the English review.
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Yuan, L., Bao, D.J., Jin, Y. et al. Influence of fertilizers on nitrogen mineralization and utilization in the rhizosphere of wheat. Plant Soil 343, 187–193 (2011). https://doi.org/10.1007/s11104-010-0640-7
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DOI: https://doi.org/10.1007/s11104-010-0640-7