Effect of co-applied cowdung and inorganic nitrogen on microbial respiration in soil under laboratory conditions
| Autor: | Akinyemi Olayinka |
|---|---|
| Rok vydání: | 2001 |
| Předmět: | |
| Zdroj: | Communications in Soil Science and Plant Analysis. 32:3229-3242 |
| ISSN: | 1532-2416 0010-3624 |
| DOI: | 10.1081/css-120001117 |
| Popis: | A laboratory incubation study was carried out for 8 weeks at 30°C to assess microbial respiration and nitrogen (N) transformation in a sandy loam, Iwo series (Oxic Tropudalf) amended with both inorganic N and cowdung. The treatments consisted of 3\times 3 factorial combinations of manure and inorganic N. Cowdung rates were 0, 12, 24 t ha−1 and rates of (NH4)2SO4 were 0, 25, and 50 mg N kg−1 (0, 60, and 120 kg N ha−1) in soil. Manure, N and their interactions had significant (P=0.05) effects on soil microbial respiration and N transformation. While inorganic N alone increased acidity, cowdung increased soil pH and thus ameliorated the acidity produced as a result of nitrification. Microbial respiration increased with the rate of cowdung with and without N addition. While N immobilization was evident at the end of the 2nd week, there was net mineralization at the end of the 8th week of incubation. The increases in inorganic N concentrations between the 2nd and 8th week of incubation were 514 and 55... |
| Databáze: | OpenAIRE |
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