Species, climate and fertilizer effects on grass fibre and protein in tropical environments

Tran H., Salgado Paulo, Lecomte Philippe. 2009. Species, climate and fertilizer effects on grass fibre and protein in tropical environments. Journal of Agricultural Science, 147 (5) : 555-568.

Quartile : Q1, Sujet : AGRICULTURE, MULTIDISCIPLINARY

Résumé : A 3-year experiment (2005-07) was conducted on Reunion Island (France) to evaluate the effect of species, climate and fertilization levels on fibre and protein fractions of tropical (C4; Chloris gayana and Pennisetum clandestinum) and temperate (C3; Dactylis glomerata and Lotium multiflorum) grasses. A near infrared reflectance spectroscopy (NIRS) prediction referential was developed to estimate neutral detergent fibre (NDF), acid detergent fibre (ADF), crude protein (CP), NDF insoluble protein (NDF-IP) and ADF insoluble protein (ADF-IP). The NIRS equations were then used to screen many regrowth grass samples collected at heading stage continuously for 3 years to evaluate their changes during the seasons. Results showed that grass species differed significantly in fibre and protein fractions. NDF, ADF and ADF-IP were the lowest in D. glomerata/L. multiflorum and the highest in C. gayana. The wet season was associated with higher NDF, ADF and NDF-IP in D. glomerata/L. multiflorum and lower NDF-IP in P. clandestinum. Fertilization increased the CP in C. gayana and the NDF-IP in P. clandestinum, but decreased the ADF-IP of both C. gayana and D. glomerata/L. multiflorum. Growth rate strongly changed NDF, ADF, NDF-IP and ADF-IP although no change in CP appeared. In general, NDF, ADF and NDF-IP increased with the growth rate. In contrast, the ADF-IP content decreased from slow to fast growth rate in C. gayana and D. glomerata/L. multiflorum. Growth rate changes were thus considered as a general indicator for fibre and protein fraction variations of these grasses.

Mots-clés Agrovoc : technique analytique, testage non destructif, spectroscopie infrarouge, plante fourragère, aliment du bétail, fibre végétale, fibre brute, teneur en protéines, fertilisation, facteur climatique, choix des espèces, graminée, Dactylis glomerata, Lolium multiflorum, Pennisetum clandestinum, Chloris gayana, technique de prévision, croissance, facteur du milieu, zone tropicale, métrologie

Mots-clés géographiques Agrovoc : La Réunion, France

Classification Agris : L02 - Alimentation animale
F60 - Physiologie et biochimie végétale
F04 - Fertilisation
P40 - Météorologie et climatologie
F70 - Taxonomie végétale et phytogéographie
U30 - Méthodes de recherche

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Tran H., Hanoï University of Agriculture (VNM)
• Salgado Paulo, CIRAD-ES-UPR Systèmes d'élevage (FRA)
• Lecomte Philippe, CIRAD-ES-UPR Systèmes d'élevage (REU) ORCID: 0000-0003-1040-7886

Source : Cirad - Agritrop (https://agritrop.cirad.fr/569299/)

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