全 文 ： ACTA AGRONOMICA SINICA 2008, 34(2): 297−304 http://www.chinacrops.org/zwxb/
ISSN 0496-3490; CODEN TSHPA9 E-mail: xbzw@chinajournal.net.cn
:  (2001-26)  (2004BA520A03)
 : (1967–), , !#$, %&, (), *+,-./01234562789:E-mail: zzj@yzu.edu.cn;
Received(<=>?): 2007-03-28; Accepted(@A>?B: 2007-08-10.
DOI: 10.3724/SP.J.1006.2008.00297
  
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Growing Characteristics of Rice Seedlings of Over-Optimum Age for
Mechanical Transplanting
ZHANG Zu-Jian1, WANG-Jun1, LANG You-Zhong1, YU Lin-Hui2, XUE Yan-Feng2, and ZHU Qing-Sen1
(1 Agricultural College, Yangzhou University, Yangzhou 225009, Jiangsu; 2 Popularization Center of Agricultural Machinery of Jiangsu Province,
Nanjing 210014, Jiangsu, China)
Abstract: The rice seedlings grown for a long time and not suitable for mechanical transplanting are called as “seedlings of
over-optimum age”. In this study, Yangjing 9538 was planted in seedling raising plates with different treatments of seedbed soil
fertilizing levels. In the stage of 28 days after sowing, the above ground parts of seedlings could still maintain a few growth, seed-
ling dry weight and the dry weight perunit of seedling height still had a little increment. But leaf color (SPAD) descended quickly.
The roots grew stagnantly, root length and number of roots stopped increasing, the activity of root and root/shoot ratio descended
quickly, and obviously. In the stage of 36 days after sowing, the seedling height increased quickly none the less, the dry weight per
unit of seedling height descended significantly, seedling leaf color kept in a low level. The activity of root was low and the root
system growth activity was in the lowest level. The seedling sugar metabolism was sensitive to the stage when the seedlings were
at over-optimum age, while nitrogen metabolism was blunt, so the ratio of seedling sugar to nitrogen in the stage of 36 days after
sowing descended significantly. The characteristics of seedling growth in the stage when the seedlings were at over-optimum age
affected significantly by different fertilization levels. Under high level of fertilization, the basal part width of shoot wasn’t changes
obviously, but seedling height increased quickly, so the dry weight per unit of seedling height descended quickly; the roots grew
weakly than these under low level of fertilization, root number and root length were less, the root system growth activity de-
scended quickly, root/shoot ratio descended obviously. The seedbed soil fertilization level affected carbon and nitrogen metabo-
lisms obviously, nutrition decreased largely under high level of fertilization. The above results showed that, rice seedling growth
298      34
in the stage of 28 days especially 36 days after sowing was decided by the growing condition in a very great degree. The rice
seedling in the low fertilization level can maintain higher sugar to nitrogen ratio in the stage when the seedling were at
over-optimum age, and keep better nourishment for seedling growth.
Keywords: Rice; Mechanical-transplanting rice; Seedling raising; Seedlings of over-optimum age; Seedling quality
   
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