Japanese Journal of Crop Science
Online ISSN : 1349-0990
Print ISSN : 0011-1848
ISSN-L : 0011-1848
Agronomy
The Factors Improving Seedling Establishment and Early Growth in Root-elongated Rice Seeds that were Direct Seeded, without Seed Coating, using a Puddling Seeder
Hiromi IMASUHiroyuki SHIRATSUCHIKeiko ITOKen TABUCHIMasami FURUHATAYoshiaki KAWANA
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2022 Volume 91 Issue 3 Pages 205-214

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Abstract

Root-elongated rice seeds that have roots emerged during the pre-germination period are used in the direct seeding of rice using a puddling seeder for improved seedling establishment and seedling vigor. We investigated the factors responsible for these improvements, in field experiments conducted in 2017, 2018 and 2019. Root-elongated seeds (RS), coleoptile-elongated seeds (CS), and pre-germinated seeds (GS) were sown in paddy fields with a puddling seeder. While more than half of CS were damaged, RS were not damaged during machine seeding. The percentage of seedling establishment using RS was 74–90%, which was higher than that using CS and GS. There was no difference in the sowing depth of RS, CS and GS. The percentage of seedling establishment using RS was higher than that using GS regardless of the sowing depth. Furthermore, the seedlings of RS emerged earlier than those of GS, and leaf number and shoot weight were greater than those of GS. These results suggest that root-elongated seeds are not significantly damaged by machine seeding and that their seedlings emerge quickly from a relatively deep sowing depth, which contributes to the high seedling establishment percentage. The quick seedling emergence also promotes early growth of root-elongated seeds.

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© 2022 by The Crop Science Society of Japan
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