2002
DOI: 10.1016/s0167-8809(01)00288-2
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The Dutch Mineral Accounting System and the European Nitrate Directive: implications for N and P management and farm performance

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Cited by 100 publications
(60 citation statements)
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“…For each dairy farm, we computed the annual surplus of nitrogen (N) and phosphate (P 2 O 5 ) using input-output accounting at farm level. This surplus is derived from the difference between farm inputs and farm outputs, with respect to N and P 2 O 5 , while the farm itself is considered a black box (Ondersteijn et al, 2002). Farm inputs of N and P 2 O 5 considered were: clover N-fixation, deposition, and import through roughage, concentrates, animals and manure.…”
Section: Methodsmentioning
confidence: 99%
“…For each dairy farm, we computed the annual surplus of nitrogen (N) and phosphate (P 2 O 5 ) using input-output accounting at farm level. This surplus is derived from the difference between farm inputs and farm outputs, with respect to N and P 2 O 5 , while the farm itself is considered a black box (Ondersteijn et al, 2002). Farm inputs of N and P 2 O 5 considered were: clover N-fixation, deposition, and import through roughage, concentrates, animals and manure.…”
Section: Methodsmentioning
confidence: 99%
“…The P content in some protein supplements, especially in RSM, is high compared with the basal diet based on forages and grains (MTT, 2014). According to literature, N and P are routinely overfed to ruminants, which leads to nutrient surpluses (Jonker et al, 2002;Ondersteijn et al, 2002;Dou et al, 2003). Therefore, it is important to evaluate if protein supplements can be reduced or excluded from grass silage-based diets without compromising animal performance.…”
Section: Introductionmentioning
confidence: 99%
“…Losses during animal feeding were included in the manure production. According to Ondersteijn et al (2002) and Børsting et al (2003), a nutrient use efficiency coefficient (NUE) was calculated to evaluate the efficient conversion of total inputs into products sold (meat, dairy products and cash crops), as follows:…”
Section: The Farm-gate Balancementioning
confidence: 99%