Selection of Artificial Potting Media and Formulations of Fertilization for Camellia japonica Allelopathic effects of the humus soils from Betula platyphylla and Quercus liaotungensis pure plantations on 9 kinds of common shrubs and herbs. Effects of water supply condition in media on C、N metabolic products of sweet pepper potting seedlings and the relationship with development Allelopathic Effects of the Humus Soil of Populus simonii and Robinia pseudoacacia on Tested Common Shrubs and Grasses Efects of W ater Supply Status in M edia on C, N M etabolism of TomatoPotting Seedlings and the Relationship with Growth and Development