Usually, organic amendments, i.e compost and manure, have been applied on the soil row in solid state, but in the last years liquid organic products (humic extracts) are being used. These amendments are basically a mixture of concentrated humic substances, i.e. humic (HA) and fulvic acids (FA). Humic substances has a strong affinity for Cu, thus they can affect the fate of this element in soils. In some fertile soils of central Chile the available Cu concentration in the arable layer is highly elevated, leading to plant toxicity. In this scenario, organic matter (OM) applications could be used to reduce Cu availability for plants, improving plant growth. The main objective of this study was to evaluate the effect of the application of two solid and one liquid organic amendments: turkey manure, vineyard compost, and compost-derived HA, on the soil Cu extractability and growth and aerial dry matter (DM) yield of maize and ryegrass plants grown in pots (5L and 2L) using a contaminated Mollisol (DTPA-Cu = 90 ppm). Maize and ryegrass plants were consecutively cultivated during the experimental period (140 days) using a complete random design with 4 replications. Amendments were applied 10 days before the first crop (maize), and both plant species were chemically fertilized (NPK). Application rates of manure and compost were equivalent to 6.6, 13.3 and 17,7 ton C/ha, while the application rate of HA was equivalent to the FA+HA-C of the manure. Control treatments with and without chemical fertilization were also included. Total DM production of maize and ryegrass was quantified, and root samples were taken as well to perform the malondialdehyde (MDA) test to determine possible damage at a membranes level. At the end of the experiment, analyzed soil properties included among others: pH, OM, water soluble C (Cws), HA-C, FA-C, and extractable Cu. The extractability of Cu was determined using the 0.005 M DTPA and 0.01 M CaCl2 methods. The analyses were performed by AAS, and also the free CaCl2-Cu+2 concentration was analyzed by ion selective potentiometry. Aerial DM ... 전체 초록 보기