Influence des facteurs agro-climatiques sur les modalités d'allocation de la biomasse produite aux différentes composantes lignocellulosiques des structures de la canne à sucre

Abstract : In spite of economical impact and environmental challenge linked to renewable energy production from sugarcane biomass combustion, sugarcane cropping system are still optimized for sucrose mass production only. This work aims to build a module for simulation of energetic yield components (CRE) of the sugarcane biomass which will be of interest in future conception and optimization of innovative sugarcane cropping system focusing on multi-uses production objectives. Both energetic yield (MJ m-2) and sucrose mass (kg m-2) are kept for those cropping system. However, checking effects of agro-climatic factors before to formalize the evolution of CRE of the sugarcane biomass (anatomical parts, fiber and lignocellulosic compounds) is required. In parallel a large amount of data from field study is needed. Thus we developed a near infrared model to predict CRE of sugarcane biomass samples from 3 cultivars (R570, R579 et R585) planted in 4 contrasted environments during 2 crop cycles (plat crop and first ratoon). It results from this study that there were significant differences between crop cycles, sites, cultivars, method of harvest and anatomical parts for CRE and energetic yield. Nevertheless, aboveground biomass of sugarcane explains more than 97% of the variability of energetic yield at harvest. Rise in aboveground biomass appears to be the main parameter target to reach rise in energetic yield. However, news production objective can cause important decrease in sugar extracting yield because of sugar looses during extraction process. These antagonisms must be identified, quantified and taking into account for sugarcane cropping system performance evaluation and especially as long as sucrose remains the main source of money.
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Damien Sabatier. Influence des facteurs agro-climatiques sur les modalités d'allocation de la biomasse produite aux différentes composantes lignocellulosiques des structures de la canne à sucre. Agronomie. AgroParisTech, 2012. Français. ⟨NNT : 2012AGPT0021⟩. ⟨pastel-00944800⟩

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