옥수수재배 시 바이오차팰렛 시용량에 따른 토양 화학성 변화에 미치는 영향

Effects of blended biochar pellet application rates on soil chemical properties for corn (Zea mays) cultivation

Objectives of this experiment were to investigate the changes of soil chemical properties and estimate carbon sequestration according to application rates of blended biochar pellet during corn cultivation. The treatments were MgO (40% N + 0.07M MgO), and 60% of blended biochar pellet (60% N) based on the recommended application rates of fertilizer for corn cultivation by National Institute of Agricultural Sciences. Application amounts of 10a -1 and 440kg 10a -1 , respectively. Nitrogen fertilizer was separately applied at 2 times as basal and additional application and the other were applied with whole basal application before transplanting. However, blended biochar pellets were applied as whole basal application with different rates. Chemical analysis was performed in the runoff water and soil, and then measured fresh biomass weight for biomass growth responses of corn to different blended biochar application rates. For the results of this experiment, it shown that the residual contents of NH4-N, NO3-N, P2O5 and K2O in the treatments of blended biochar application rates were lower than those of the control through corn cultivation periods. However, the K2O contents in the treatments were higher than those in the control at 21 days and 51 days after corn transplanting. NH4-N and NO3-N contents of runoff water in the control appeared to be higher than those of the blended biochar pellet treatments, but PO4-P and SiO2 contents did not significantly different (p>0.05) between the control and blended biochar application plots. Carbon sequestration (60.0 kg 10a -1 ) did not significantly different between the control and 40% N + 0.07M MgO treatment plot. Fresh biomass weights in the control were not significantly different with all the treatments except for the 60% N even if reduction of nitrogen fertilizer application were decreased 60% relative to the control. Therefore, it was decided that application of blended biochar pellet for corn cultivation was potential benefit to enhance the nutrient use efficiency as well as reduction of the chemical fertilizer mounts for corn cultivation in agricultural practices.