Soy Magíster en Ciencias Agrícolas formado por la Escuela Superior de Agricultura “Luiz de Queiroz” de la Universidad de São Paulo (jul./2015) e Ingeniero Agrícola egresado de la Facultad de Ingeniería de la Universidad Nacional de Colombia (sep./2007). Me he desempeñado como docente en el área de hidrología, meteorología y adecuación de tierras por cerca de once años. Oriento las siguientes asignaturas: mecánica de fluidos, hidráulica, hidrología, uso y manejo de agua, meteorología y climatología. Soy director de trabajos de grado de investigación y tutor de actividades de servicio social universitario. Coordino el semillero de investigación Cambio Climático y Gobernanza del Agua CCGA e integro el grupo de Investigación INGEDET de la Universidad de Ciencias Aplicadas Ambientales.
Jonathan Vásquez Lizcano
LÍNEAS DE INVESTIGACIÓN: Recursos Naturales, Cambio Climático y Gestión del Riesgo
FACULTAD: Ciencias Ambientales e Ingenierías
NIVEL DE FORMACIÓN: Maestría/Magister
Influence of deficit irrigation on accumulation and partitioning of sugarcane biomass under drip irrigation in commercial varieties
Fecha de publicación: 20/07/2019
Studies of sugarcane varieties grown under water-restrictive conditions are necessary because climate changes may result in insufficient rain for agriculture and selecting or breeding drought-tolerant cultivars will become more and more important. This study aimed to quantify the accumulation and partitioning of biomass, as well as water use efficiency of commercial sugarcane varieties under different soil water availability conditions throughout the growing season. The study was conducted during two cropping cycles in Southeast Brazil (22.7 °S, 47.6 °W). Four soil moisture availability regimens were set up to provide 100, 75, 75* and 50% of the water demand of eight commercial varieties of sugarcane (CTC15, CTC17, RB867515, RB92579, RB931011, RB966928, IAC5000, and NCo376). The total aboveground biomass was measured in both crop cycles. Our results indicate that two Brazilian varieties (CTC15 and CTC17) and one South African variety (NCo376 – Canegrow DSSAT reference), increased their water use efficiency when grown under an irrigation deficit of 75% of normal, without yielding less biomass. We did not observe any change in sucrose content under controlled water deficits; however, the studied varieties showed different biomass partitioning: RB966928 had the largest biomass fraction allocated in the stalks (0.59), while IAC5000 showed the lowest fraction (0.51). We verified that the harvest index for sucrose was not altered by reduced irrigation, but that its variability was attributed to the genotype inherited from traditional breeding programs. Thus, we conclude from these results that increased sugar yield per unit area is only possible nowadays by increasing sugarcane biomass productivity under highly efficient irrigation conditions to minimize the loss of yield from water stress.
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Effect of water stress on renewable energy from sugarcane biomass
Fecha de publicación: 13/02/2019
The higher heating value (HHV) of sugarcane biomass components has been well documented; however, the effect of different soil water levels (abiotic stress) during the growing season on HHV has not been assessed for this energy crop. Drip irrigation in sugarcane production presents a potential to be a disruptive technology for sugarcane mills in terms of water-energy-nexus, making this inextricable relationship more efficient. The objective of this article was to quantify the higher heating value and useful energy from biomass partitions of different sugarcane varieties (Saccharum spp.) drip irrigated at four water levels and four maturation processes (drying off intensity prior to harvesting time); this information is not available in literature to date. The contribution of this article to the state of the art of knowledge are: a) the heating values for sugarcane partitions: bagasse, leaves and pointers did not vary significantly for varieties, water stress levels under drip irrigation and maturation processes; conversely, the heating value for the sheath biomass partition vary significantly for varieties. The average heating values for all treatments for the bagasse, sheaths, leaves and pointers were 18.16, 17.21, 17.64 and 17.84 MJ kg−1 respectively; b) the useful energy in sugarcane is almost totally dependent on the biomass produced per unit of area; drip irrigation levels and sugarcane variety traits are important in establishing the bioenergy productivity per area; the average value obtained for all treatments was 660.29 GJ ha−1 year−1 (36.90 Mg dry mass ha−1 year−1). Drip irrigated sugarcane crops at higher water levels in the soil, resulted a higher intensive land use and less deforestation pressure at sugarcane bioenergy production areas.
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