Ecology and Control of a Subspecies of Paspalum distichum L. “Chikugo-suzumenohie” Growing in Creeks in the Paddy Area on the Lower Reaches of Chikugo River

2. Morphological Characters and Growth Habit

Abstract

1. Morphological characters and growth habit of a subspecies of P. distichum L. “Chikugo-suzumenohie” were investigated and compared with those of the common variety P. distichum L. “Kishu-suzumenohie”
2. Morphological characters of “Chikugo-suzumenohie” were more suited to the creek environment and the plant grew more vigorously than “Kishu-suzumenohie”. The whole surface of the creeks where overwintering stems were planted on the border was covered with the plants within two or three years.
3. The higher the concentration of NH₄-N in water, the more vigorously both species grew. The effect of concentration in the case of P₂O₅ was less evident than in the case of NH₄-N.
4. Adaptability of “Chikugo-suzumenohie” to the pH of water and soil moisture was lower than that of “Kishu-suzumenohie”.