Effect of seeding rates on the endosperm depletion and seedling growth of rice for machine transplanting
1988
Kim, Y.J. | Shin, H.R. | Song, D.S. | Jang, K.Y. (Chonnam National Univ., Kwangju (Korea R.). Coll. of Agriculture)
This study was carried out to investigate the change of endosperm substance and seedling growth in rice seedlings for machine transplanting with use of two rice varieties. Samgangbyeo (Indica x Japonica) and Dongjinbyeo (Japonica) were sown on May 8 with five levels of seeding density. The total dry matter weight, leaf area, length of the longest root, number and length of new roots were negatively correlated with seeding density, and the plant height had the similar tendency to them from 20 days after sowing(DAS). The rooting ability was negatively correlated with seeding density and decreased from 35 DAS in Dongjinbyeo. The endosperm substances were exhausted at 25 to 30 DAS in Samgangbyeo and at 25 DAS in Dongjinbyeo. The leaf area was more useful than the ratio of plant height to dry matter weight for judging the constitution of seedlings. The reducing sugar contents in the endosperm were the greatest among parts of rice seedlings followed by leaf and root. The contents in leaf, root and endosperm reached a maximum at 10 DAS, and varied with plant parts, seedling growth and varieties in different levels of seeding density. The protein contents in leaf and root of rice seedlings decreased with seedling growth, and were minimal values at 15 DAS. The content in endosperm decreased soon after seeding, and minimal at 4 DAS with showing some fluctuation of protein content after then
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