See more from this Session: General Soil and Environmental Quality Posters: I
On the ridge position, two groups of 18 Quercus serrata trees with diameter at breast height (DBH) of 20-30 and 30-50 cm were selected from an area of about 0.5 ha. From the valley bottom there were 15 and 12 trees of Cryptomeria Japonica in the corresponding two groups. Powdered charcoal from coniferous tree, nitrogen as slow-release coated urea, and phosphorus as calcium superphosphate were applied and mixed 5 cm deep after removing litter layers. They were applied at 6 t/ha in carbon equivalent for charcoal, 140 kg/ha for nitrogen and 30 kg/ha for phosphorus at the forest floor surrounding tree trunk on an area of 16 and 25 m2 for trees with DBH of 20-30 and 30-50 cm, respectively. The forest floors were thereafter covered with litter layers to protect the topsoil. There were four replications for Quercus serrata and three replications for Cryptomeria japonica. The set-up was established during February-March 2011. The presentation will discuss the results of the first growing season spanning April to October 2011.