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Bussink, D.W., G.H. Ros, N.J.M. van Eekeren. 2018. A new approach to N fertiliser advice on grassland in the Netherlands. p. 836-838. In: EGF 2018: Sustainable meat and milk production from grasslands. Grassland Science in Europe. Cork, Ireland. 17-21 June 2018.

Aantal pagina's: 3

Soort document: Conference Proceedings

Download full text pdf, 0,57 MB; opent in nieuw venster

Meer over auteurs/freelancers verbonden aan het LBI :
Dr. Ir. Nick J.M. van Eekeren


Taal van het document: Engels

Title in English: A new approach to N fertiliser advice on grassland in the Netherlands

Abstract / summary in English:

Advice on the nitrogen (N) fertilisation of grassland is usually based on the N supply of the soil (SNS). Generally, a higher SNS results in advice for lower N fertilisation rate. Recent research showed that the recommended N fertiliser rate can deviate by more than 60 kg ha-1 y-1 from the optimum. Historic and recent grassland field trial data are, therefore, re-analysed to improve the accuracy of optimum fertiliser rates. Since 1950, over 250 trials were carried out on 140 different locations, resulting in a database with about 10,000 records. The main soil types were sand (46%), clay (21%), river clay (4%) and peat (28%). Analysis showed that the SNS increased over time and that the apparent nitrogen recovery (ANR) was constant over N doses varying between 0-350 kg ha-1 y-1. However ANR varied considerably between sites and years. We used machine learning algorithms (random forest models) to estimate the ANR in response to soil, weather and management. Initial results showed that it was possible to accurately distinguish fields with ANR.


Keywords in English: soil N delivery, ANR, N fertiliser, random forest
A new approach to N fertiliser advice on grassland in the Netherlands