Germination ecology of spiny (Amaranthus spinosus) and slender amaranth (A. viridis): troublesome weeds of direct-seeded rice

Chauhan, Bhagirath S. and Johnson, David E. (2009) Germination ecology of spiny (Amaranthus spinosus) and slender amaranth (A. viridis): troublesome weeds of direct-seeded rice. Weed Science, 57 4: 379-385. doi:10.1614/WS-08-179.1


Author Chauhan, Bhagirath S.
Johnson, David E.
Title Germination ecology of spiny (Amaranthus spinosus) and slender amaranth (A. viridis): troublesome weeds of direct-seeded rice
Formatted title
Germination ecology of spiny (Amaranthus spinosus) and slender amaranth (A. viridis): troublesome weeds of direct-seeded rice
Journal name Weed Science   Check publisher's open access policy
ISSN 0043-1745
1550-2759
Publication date 2009
Sub-type Article (original research)
DOI 10.1614/WS-08-179.1
Open Access Status
Volume 57
Issue 4
Start page 379
End page 385
Total pages 7
Place of publication Lawrence, KS, United States
Publisher Weed Science Society of America
Language eng
Abstract Spiny and slender amaranth are troublesome Amaranthaceae species of direct-seeded rice and other upland crops in many Asian countries. Seed germination and seedling emergence response of these species to various environmental factors was determined in laboratory and screenhouse experiments. Germination in both species was stimulated by 35/25 and 30/20 C fluctuating temperatures and light. Germination of slender amaranth was more sensitive to increasing salt and water stress than spiny amaranth. Spiny amaranth germinated at a NaCl concentration of 100 mM (19%), whereas slender amaranth seeds did not germinate at this concentration. In seed burial trials where the seeds were on the soil surface, emergence was 56 and 68% for spiny amaranth and slender amaranth, respectively. Only 7% of spiny amaranth seedling emerged from a soil depth of 0.5 cm, whereas no emergence was observed for 4 cm or deeper. For slender amaranth, 6 and 0% emergence was observed at 4 and 6 cm, respectively. Seedling emergence of spiny amaranth was affected more by high rates of rice residue than slender amaranth. Greater quantities of residue than those normally found in rice fields were required to significantly reduce weed densities.
Keyword Emergence
Germination
Keywords: Burial depth
Light
Residue
Temperature
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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