Management strategies to improve the nitrogen use efficiency in grasslands and the protein quality in grass silages: Lessons from a practical study on dairy farms in Flanders

Tine Van den Bossche, Johan De Boever, Geert Haesaert, Mathias Cougnon, Sandra Debevere, Leen Vandaele, Karen Goossens

Research output: Contribution to journalA1: Web of Science-articlepeer-review

Abstract

Background

Grasslands are the primary source of forage for ruminants. Legal restrictions on nitrogen fertilization force farmers to optimize nitrogen use efficiency (NUE) of grassland and protein quality in grass silage.
Methods

The present study included grassland data from 10 dairy farms in Flanders. For each grassland field, the presence of clover was determined based on the seed mixture composition. Soil and manure were sampled before the first application and analyzed to determine plant available N content. The annual NUE was calculated for each field possible (n = 28). Prewilted grass samples were taken just before ensiling (n = 65) and grass silage samples (n = 41) were collected from the same fields.
Results

Clover fields demonstrated improved NUE due to a lower nitrogen input from fertilizers compared to pure grassland fields (75 vs. 265 kg ha−1). The protein quality of the grass silage was positively correlated with the organic matter digestibility, sugar content, and dry matter content of the prewilted grass. Conversely, crude ash content had a negative effect.
Conclusions

These findings underscore the importance and potential of clover and the practical feasibility of optimizing grassland management to improve both NUE in grasslands and protein quality of the silage.
Original languageEnglish
JournalGrassland Research
Volume3
Issue number1
Pages (from-to)18-32
Number of pages15
ISSN2770-1743
DOIs
Publication statusPublished - 7-Mar-2024

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