K. Hoshikawa et al., DEVELOPMENT AND ROOTING CAPACITY OF RICE NURSLING SEEDLINGS GROWN UNDER DIFFERENT RAISING CONDITIONS, Nippon Sakumotsu Gakkai Kiji, 64(2), 1995, pp. 328-332
To reduce the raising period of rice nursling seedling and to obtain e
nough plant length (7 cm) for mechanical transplanting, nursling seedl
ings were raised under different light conditions and for different ra
ising periods. The length of nursling seedlings which was raised in th
e dark (yellow nursling seedlings; YNS) for 7 days was 9.6 cm long. Wh
ile that raised in the natural light (green nursling seedlings; GNS) f
or 2 days at 25 degrees C and then placed in a vinil house for 3 days
was 5.5 cm long. The length of YNS raised for 4 days was 4.1 cm, which
is not the adequate size required for mechanical transplanting. The d
ifferences between root numbers as well as that between the longest ro
ot length of YNS and GNS at 5 and 10 days after transplanting were not
significant. The amount of dry weight increase of YNS until 10 days a
fter transplanting was lower than that of GNS. There was high correlat
ion (r = 0.984) between the increase of dry weight and consumption of
endosperm nutrient for all kinds of seedlings. In all treatments, a h
igh correlation (r = 0.994*) was also observed between the increase o
f total dry weight and consumption of endosperm nutrient until 5 days
after transplanting. The growth and development of seedlings at this i
nterval depended on the nutrient in the endosperm. Based on these resu
lts, yellow nursling seedling might have been used as rice seedling.