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Effect of compost and biochar on cultivation of lettuce (LACTUCA SATIVA L) irrigated with secondary outflow

Bontiotis Kon/nos

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Summary

In this particular dissertation, two different soil improvers were applied in various proportions to arable soil and the growth of plants was studied. The two soil improvers used, were Compost from DEDISA and a Biochar manufactured from the Compost mentioned above. Biochar was prepared by pyrolysis at 300ο C for 4h. The proportions we used in soil improvers were 1% 2.5% and 5% compared to soil. A combination of the two soil improvers with the soil was also chosen. Particularly four repetitions were selected in each treatment, resulting in the total crop being 40 pots. As a watering medium, a treated liquid waste was chosen, which comes from secondary precipitation, which is chlorinated. After 40 days of cultivation, the lettuces were harvested and laboratory analyses began, after the soil samples of the crops and the logs of the plant were separated. Initially, the soil we chose as the basis of the crop, as well as the other soil improvers, were characterized. In the characterization of the initial and final soil samples there are measurements of pH, conductivity (EC), total and available phosphorus as well as nitrogen derived from ammonium compounds (NH4-N) and nitrates (NO3-N). Finally, the metals were determined in the initial and final soil samples as well as in the logs. There are also measurements in the original samples for organic and inorganic carbon (TOC,IC), their cation exchange capacity (CEC), ash determination and bulk density. As far as the logs are concerned, measurements were made on total nitrogen (TN) and phosphorus P (TP). Through the results it was observed that the soil used in the experimental process, benefited significantly from the use of a soil improver. In particular, compost significantly enhanced phosphorus and nitrogen concentrations, while biochar did not manage to have a positive effect as expected. The combination showed similar and lower results than crops containing compost and biochar.

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