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Agronomic effects of the addition of biochar from different feedstocks to a typical Mediterranean agricultural soil in relation to the application rate

AutorPaneque Carmona, M. ; Rosa Arranz, José M. de la ; Knicker, Heike
Fecha de publicación16-ene-2014
EditorUniversità di Palermo
Citación2nd Mediterranean Biochar Symposium, 16-17 January, Palermo (Italia) 2014
ResumenBiochar has been proposed as a new ecological amendment and its capability to enhance agronomic productivity has been demonstrated (Sohi et al., 2010). Biochar may improve the retention of nutrients and provides refuge for beneficial soil micro-organisms. In addition, it can increase the pH, electrical conductivity and cation exchange capacity of soil. All of this makes biochar a suitable product for agricultural purposes. Additionally, the benefits of this product also vary according to the kind of soil and crop under consideration as well as the application rate. The main goal of this study was to evaluate the application effect of four contrasting biochars on the agricultural productivity of a typical calcareous Mediterranean agricultural soil. Each biochar was produced from different feedstocks. Three of them were supplied by the European Biochar Research Network & COST Action TD1107 and consisted of 1) wood biochar, 2) paper-sludge biochar and 3) sewage-sludge biochar. The fourth was provided by a Spanish winery and consisted of 4) grapevine wood biochar. A greenhouse incubation study was carried out, lasting for 79 days. Pots contained 150 g of soil and an amount of biochar equivalent to 10, 20 and 40 t ha-1 were prepared in quadruplicate for each biochar using grass as test plant (40 seeds per pot). Control pots, without biochar amendment, were also settled for comparison purposes (n=6). After adjusting the soil humidity to 60% of the maximum WHC, the pots were placed into a greenhouse under similar conditions than those reported by De la Rosa et al 2013. Briefly they consisted of 25 ºC, 14 h light day-1 and water supply equivalent to 760 L m-2 per year. In this experiment, germination and survival rates were measured by accounting the number of shoots per pot each week. Additionally, biomass production was calculated by cutting, drying (48 h at 40 ºC) and weighing the shoots each 15 days until the end of the experiment. This experiment confirmed that the benefits of biochar in agriculture vary according to the kind of biochar used and its application rates. Germination and plant-survival increased significantly in all biochars except for grapevine wood biochar (biochar 4). In this case, it resulted in similar germination rates than un-amended pots. In addition, biomass production raised significantly in presence of all biochars, being the response in presence of biochars 1, 2 and 3 significantly higher than the response in presence of biochar 4. Regarding the application rates, the biomass production was significantly increased for all doses when comparing to the control pots. Excepting biochar 3, the application rates of 10 and 20 t ha-1 produced a major agronomic effect than 40 t ha-1, which suggests a possibly harmfulness effect of biochar at high application doses. References: De la Rosa J.M., Liebner F., Pour G., Knicker H., 2013. Soil Biology & Biochemistry, 60, 125-133. Sohi S.P., Krull E., Lopez-Capel E., Bol R., 2010. Advances in Agronomy, 105, 47-82.
DescripciónPresentacion de PowerPoint en la Session 4. Agro-Environmental Effect of Biochar, 2nd Mediterranean Biochar Symposium, 16-17 January, Palermo (Italia) 2014
Versión del editorhttp://www.meditbiochar.org/uploads/1/1/0/8/1108765/m_paneque_et_al_agronomic_effects_of_the_addition_of_biochar_from_differetn_feedstocks_to_a_typical_maditerranean_agricultural_soil_in_relation_to_the_ap.pdf
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