This study is aimed to investigate the effects of different biochars obtained from tomato harvest residues (THR) on the growth, nutrient concentrations and nutrient uptakes of corn plant. For this purpose, biochars were produced using THR, using a pyrolyser at temperature of 300, 400, 500, 600, and 700 ºC with application duration of 40, 80, 120, and 240 minutes. THR had C and N content of 22.12 % and 2.00 %, respectively. Biochars obtained at five application temperatures and four application durations were applied with the rates of 10 and 40 t•ha-1. The experiment was conducted in a greenhouse. After 2 months growth period, the plants were harvested above ground of the soil. Harvested plants were washed and dry weighted and mineral nutrient concentrations of the plants were determined. The results showed that low application rate (10 t•ha-1) of biochar obtained at 300-600 ºC and at longer duration increased the plant growth. However, there is no systematic effect of different biochar applications on nutrient concentrations of corn plant generally.

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The aim of this study was to investigate the effects of biochars obtained by pyrolysis of the tomato harvest residues at different temperatures on some available nutrient concentrations of soil. For this purpose, biochars were obtained by pyrolysis of the tomato harvest residues at 500 and 700° C for 80 minutes. The biochars were applied to the parcels prepared in 50x50 cm dimensions under field conditions to 3 tons per decare and they were left to stand in natural conditions. 2 months after the application, soil samples were taken in 4 periods at one-month intervals. In these examples, plant available and/or extractable nutrients were determined. According to the results, it was observed that biochar applications did not affect the nutrient concentrations of the soil and had a negative effect on some nutrients. The pyrolysis temperatures had no effect on the efficiency of biochar on soil nutrient concentration.