Machine Transplanting Cultivation with Infant Seedling in Rice Plant II. Effects of Raising Temperature, Duration and Nutritional Residue in Endosperm on Seedling Growth after Transplanting.

This study was carried out to investigate the minimum days for raising infant rice seedling with different temperature (day/night : 20/12, 25/18, 30/20) and to compare with seedling growth and rooting ability at 10 days after transplanting with endosperm-intacted and removed seedlings. The minimum days for raising infant rice seedling was shown differently with different temperatures, thus there were turned out by mat formation to be 10 days at 20/12 (day/night), 8 days at 25/18 and 6 days at 30/20, respectively. Seedling height, leaf number and dry weight of top part at the minimum days for raising infant rice seedling were 8-12cm, 1.5-1.7 leaves and 6.9-7. 5cm per seedling, respectively. The seedling growth at 10 days after transplanting was better at high temperatures (25/18) than low temperature (20/12) at transplanting, and the growth of infant rice seedling with endosperm -intacted was better than that with endosperm-removed. This tedency was shown significantly in transplanting at 20/12 (day/night) of 4 days seedling.