科研之友
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摘要
The present investigation is based on extensive operation records regarding annual N turnover on 36 dairy farms. The following statements can be derived from the N-mass flows and balances calculated:
Dairy farm N-mass flows and balances show a high variability.
A farm-gate balance is to the detriment of a large proportion of dairy farms respectively feed-production farms.
Where fertilization of arable land is concerned, dairy farms respectively feed-production farms operate as well or as badly as cash crop farmers.
In addition to the improvement of the farm-N efficiency, the amount of the farm-N surplus still needs to be continuously monitored.
The amount of the farm-N surplus is mostly determined by the farm's harvest yields and fertilization management.
Given the current calculation methods, many the farm-N surpluses and their inherent environmental dangers tend to be considerably underestimated.
- 出版日期2016-8
