Studies on the salt-resistance of cultivated plants : 2. Classification of cultivated plants by the salt-resistance in reclaimed tidal land and ecological relation between cultivated plants and weeds

摘要

Clear differences in salt-resistance were shown in summer among the families to which different cultivated plants belong. The maximum Nacl contents of soil tolerable for the growth of cultivated plants were as follows: Marvaceae and Compositae l.2∼1.5%, Cuculbitaceae, Solanaceae and Cyperaceae 0.8∼0.1%, Umbelliferae, Gramineae and Convolvulaceae 0.5∼0.8%, Leguminosae, below 0.5%. In the case of cultivated plants grown in autumn, winter and spring, however, the distinct differences in salt-resistance among different families could not be seen, and the author came to the opinion that the climatological factor may be one of the most basic factord which control the salt-resistance of cultivated plants in reclaimed tidal lands. The ecological relation between the weeds and crops was discussed briefly.