| Autor: |
Brian K. Richards, R.E. Muck |
| Rok vydání: |
1983 |
| Předmět: |
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| Zdroj: |
Agricultural Wastes. 7:65-79 |
| ISSN: |
0141-4607 |
| DOI: |
10.1016/0141-4607(83)90005-7 |
| Popis: |
The objectives of this study were to measure nitrogen losses from dairy manure in free-stall dairy barns which were scraped once a day and to compare these results with a previously published model predicting nitrogen losses in the barn. From two farms floor samples were collected once a week from manure just scraped from each alley. The results of this sampling programme indicated that nitrogen losses were minimal when the average daily air temperature in the barn was below 5°C. Between 5°C and 25°C the losses increased with temperature, reaching 40% to 60% of the total nitrogen in the manure. The measured losses were similar to the model's predictions below 10°C but were greater than the predicted values at higher temperatures. Since the model considered only urea and ammonia nitrogen as available for loss, it is apparent from the farm data that under warm conditions significant quantities of non-urea organic nitrogen in both the urine and faeces are ammonified within 24 h. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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