Methanogenic potential of commonly utilised South African subtropical and temperate grass species as influenced by nitrogen fertilisation
Cornelius J. L. du Toit A D , Willem A. van Niekerk A , Heinz H. Meissner B , Lourens J. Erasmus A and Liesl Morey C
+ Author Affiliations
- Author Affiliations
A Department of Animal and Wildlife Sciences, University of Pretoria, Pretoria 0002, South Africa.
B No. 3 Die Hoewes, 276 von Willich Street, Centurion, 0157, South Africa.
C ARC-Biometry, ARC-Central Office, 1134 Park Street, Hatfield, 0087, South Africa.
D Corresponding author. Email: linde.dutoit@up.ac.za
Crop and Pasture Science 70(1) 68-76 https://doi.org/10.1071/CP18293
Submitted: 21 June 2018 Accepted: 1 November 2018 Published: 4 January 2019
Abstract
The aim of the study was to evaluate the effect of nitrogen (N) fertilisation on certain quality parameters and in vitro total gas and methane production of improved grass species commonly used as fodder species in South Africa. Treatments included seven grass species representing two photosynthetic pathways (C3 and C4) with three levels of N fertilisation (0, 50 and 100 kg N ha–1). Plants were grown in a greenhouse and N was applied in a single application after a simulated defoliation. Sample material was harvested by hand after an 8-week regrowth period. Grass species and rate of N fertiliser both had effects (P < 0.05) on the nutritive value and in vitro organic matter digestibility of the selected species. Crude protein concentration increased (P < 0.05) and neutral detergent fibre concentration tended to decrease as the level of N fertilisation increased for both C3 and C4 species. Generally, no effect was found of N fertilisation on in vitro total gas or methane production; however, increasing the level of N fertiliser increased (P < 0.05) the methanogenic potential (in vitro methane/in vitro total gas production) of D. glomerata, F. arundinacea and C. ciliaris after a 24-h incubation period but no significant effects were reported after a 48-h incubation period.
Additional keywords: fermentation, greenhouse gas.
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