alexa Olive pomace amendment in Mediterranean conditions: effect on soil and humic acid properties and wheat (Triticum turgidum L.) yield.
Agri and Aquaculture

Agri and Aquaculture

Journal of Agricultural Science and Food Research

Author(s): Brunetti G, Plaza C, Senesi N

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Abstract The effects of the addition of either crude or exhausted olive pomace at two rates (10 and 20 t ha(-)(1)) on soil and soil humic acid (HA) properties and durum wheat (Triticum turgidum L.) yield were investigated in open-field Mediterranean conditions. Soil amendment with olive pomaces produced a significant increase of total organic, total extractable, humified and nonhumified C forms, and available K contents. With respect to control soil HA, humic-like acids isolated from crude and exhausted olive pomaces were characterized by larger phenolic OH group contents, smaller carboxyl group contents, a prevalent aliphatic character, extended molecular heterogeneity, and smaller aromatic polycondensation and humification degrees. In general, application of olive pomaces to soil produced a number of modifications in soil HAs, including the increase of O and acidic functional group contents, C/N ratio, and aliphaticity and the decrease of C/H ratio and N and C contents. Wheat grain yield increased significantly as an effect of olive pomace amendment. In particular, the increases were related to kernel weight, kernel number per square meter, and soil organic matter content. Possibly, the enhanced amount of soil organic matter in olive-pomace-amended soils relieved wheat of drought stress from anthesis to maturity by promoting a good soil structure, thereby reducing water loss by evaporation. This article was published in J Agric Food Chem and referenced in Journal of Agricultural Science and Food Research

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