Abstract
Rapeseed meal (RSM) is known for its high nutritional quality as animal feed. However, there has been little studies on the effect of nitrogen fertilization on RSM chemical composition, mainly neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), and ash content. Therefore, this study was carried out to evaluate the effect of nitrogen application rate on chemical composition of RSM in interaction with different spring rapeseed varieties ( Brassica napus L). A field experiment was conducted during 2018/19 cropping season at the experimental station of the Ecole Nationale d’Agriculture de Meknès” according to a split-plot design with three replications, using six nitrogen application rates, as main plot, and six rapeseed varieties, as subplot. After seeds harvest and oil extraction, meals derived from the different treatments were used in this study. Results showed that increasing nitrogen rate from 0 to 120 kg N ha −1 led to a significant rise in meal yield up to 74.58%. A positive effect of nitrogen fertilization was observed on dry matter, protein content and ash content, recording the highest values at 120 kg N ha −1 treatment. However, cellulose and lignin content were affected negatively by nitrogen fertilization. The nitrogen supply of 150 kg N ha −1 resulted in a reduction of ADF and ADL contents by 23% and 28%, respectively, compared to the unfertilized control (N0). Variability within rapeseed varieties for all parameters except dry matter and ADL content was highlighted.
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Claims 6
Claim · model-written summary
Increasing nitrogen from 0 to 120 kg N ha −1 increased meal yield by up to 74.58%.
Verbatim
e0“increasing nitrogen rate from 0 to 120 kg N ha −1 led to a significant rise in meal yield up to 74.58%”
t0“rapeseed”
Claim · model-written summary
Nitrogen fertilization increased dry matter, protein content and ash content, with maxima at 120 kg N ha −1.
- Taxon
- rapeseedt0
- Treatment
- nitrogen fertilizatione0
- Outcome
- dry matter, protein content and ash contente0
- Direction
- higheste0
- Qualifier
- 120 kg N ha −1e0
Not reportedComparator
Verbatim
e0“A positive effect of nitrogen fertilization was observed on dry matter, protein content and ash content, recording the highest values at 120 kg N ha −1 treatment”
t0“rapeseed”
Claim · model-written summary
Nitrogen fertilization reduced cellulose and lignin content.
- Taxon
- rapeseedt0
- Treatment
- nitrogen fertilizatione0
- Outcome
- cellulose and lignin contente0
- Direction
- negativelye0
Not reportedComparator
Verbatim
e0“cellulose and lignin content were affected negatively by nitrogen fertilization”
t0“rapeseed”
Claim · model-written summary
At 150 kg N ha −1, ADF content fell 23% relative to the unfertilized control.
Verbatim
e0“The nitrogen supply of 150 kg N ha −1 resulted in a reduction of ADF and ADL contents by 23% and 28%, respectively, compared to the unfertilized control (N0)”
t0“rapeseed”
Claim · model-written summary
At 150 kg N ha −1, ADL content fell 28% relative to the unfertilized control.
Verbatim
e0“The nitrogen supply of 150 kg N ha −1 resulted in a reduction of ADF and ADL contents by 23% and 28%, respectively, compared to the unfertilized control (N0)”
t0“rapeseed”
Claim · model-written summary
Varieties differed in all assessed parameters except dry matter and ADL content.
Verbatim
e0“Variability within rapeseed varieties for all parameters except dry matter and ADL content was highlighted”
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