Reducing inputs and losses of nitrogen and energy on dairy farms : final report project AIR3 CT92-0332

The need to reduce nitrogen (N) and phosphorus (P) losses as well as the (direct and indirect) use of fossil energy on intensive dairy farms in Europe to ecologically acceptable levels requires radical changes of the management of these farms. The objective of the project, (started in 1993) was to develop sustainable dairy farming systems with minimum inputs and losses of nitrogen phosphorus and energ

Some environmental aspects of grassland cultivation; the effects of ploughing depth, grassland age, and nitrogen demand of subsequent crops

The Netherlands has submitted a derogation under the Nitrate Directives to the European Union (EU) in 2000. In the final opinion by a group of experts about the Dutch derogation, recommendations on ploughing of grasslands were included dealing with i) the depth of ploughing of permanent grassland, ii) the age of temporary grassland and iii) the nitrogen demand of the subsequent crop of temporary grassland. A literature study was carried out in order to provide scientific information on these three issues. No studies were found in literature in which the effects of cultivation depth on nitrogen mineralisation and losses in reseeded grassland were assessed. The results of transformation of grassland into arable land show no clear effects of ploughing depth on N mineralisation. Differences in nitrogen mineralisation after 5 and 3 years temporary grassland are small. Italian and perennial ryegrass, potato, silage maize, winter wheat, and several vegetables have a high nitrogen demand (i.e. >250 kg N ha-1)

Stikstofbenutting uit dunne runder- en mestvarkensmest op grasland

Vanaf 1978 is een aantal proeven uitgevoerd over de stikstofwerking van op grasland geonjecteerde en bovengronds aangewende dunne rundermest

Stikstofstromen in agro-ecosystemen

The publication consists of six chapters: Simulation of nitrogen mineralization on the basis of food chain interactions in different soil ecosystems; The nitrogen cycle in an unfertilized grassland ecosystem: effects of measures in hydrology and management; Nitrogen utilization and losses in production grassland; Physiology of nitrogen uptake and utilization: crop and root characteristics; Nitrogen utilization and losses in maize cropping systems; Modelling of nitrogen utilization and losses

Schatting van de opbrengstderving door ziekten en plagen in grasland uit proeven met biociden

Een nadere analyse is uitgevoerd van de resultaten van eerder verricht onderzoek, waarin via behandelingen met de biociden thionazin en aldicarb de schade door ziekten en plagen in grasland op zand-, klei- en veengrond werd gescha