Potential for nitrogen mineralization in central Alberta soils

Autor: D. J. Heaney, S. S. Malhi, M. Nyborg
Rok vydání: 1992
Předmět:
Zdroj: Fertilizer Research. 32:321-325
ISSN: 1573-0867
0167-1731
DOI: 10.1007/bf01050369
Popis: Incubation experiments were conducted to determine the relationship between N mineralization potential of soils and yield or N uptake of barley grain. In addition, the effect of soil type and soil depth on N mineralization potential was investigated. In an experiment with 39 cultivated surface soil samples varying in organic C from 1.5 to 8.6%, the amount of mineralized N (as determined by the incubation method of Stanford and Smith, 1972) ranged from 34 to 111 mg N kg−1 over a 12-week period but the correlation coefficient between mineralized N and soil organic C was only 0.49**. Mineralized N was not correlated with grain yield or N uptake (r = 0.29 or 0.32, respectively), but there was a fairly close correlation between soil NO3-N at sowing and yield (r = 0.79**) or N uptake of barley grain (r = 0.82**). Combining soil NO3-N at sowing and mineralized N on incubation did not improve correlation. In the other experiment with just two soils, the mineralized N sharply decreased with increasing soil depth.
Databáze: OpenAIRE
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