Growth plasticity of Junglerice (Echinochloa colona) for resource use when grown with different rice (Oryza sativa) planting densities and nitrogen rates in dry-seeded conditions

Awan, Tahir Hussain, Chauhan, Bhagirath Singh and Sta. Cruz, Pompe C. (2014) Growth plasticity of Junglerice (Echinochloa colona) for resource use when grown with different rice (Oryza sativa) planting densities and nitrogen rates in dry-seeded conditions. Weed Science, 62 4: 571-587. doi:10.1614/WS-D-14-00054.1


Author Awan, Tahir Hussain
Chauhan, Bhagirath Singh
Sta. Cruz, Pompe C.
Title Growth plasticity of Junglerice (Echinochloa colona) for resource use when grown with different rice (Oryza sativa) planting densities and nitrogen rates in dry-seeded conditions
Formatted title
Growth plasticity of Junglerice (Echinochloa colona) for resource use when grown with different rice (Oryza sativa) planting densities and nitrogen rates in dry-seeded conditions
Journal name Weed Science   Check publisher's open access policy
ISSN 0043-1745
1550-2759
Publication date 2014
Sub-type Article (original research)
DOI 10.1614/WS-D-14-00054.1
Open Access Status
Volume 62
Issue 4
Start page 571
End page 587
Total pages 17
Place of publication Lawrence, KS, United States
Publisher Weed Science Society of America
Collection year 2015
Language eng
Formatted abstract
Junglerice is one of the world's most problematic C4 grass weeds present in dry-seeded rice in many countries. A screenhouse study was conducted to determine the effect of four rice planting densities (0, 100, 200, and 400 plants m-2) and four nitrogen (N) rates (0, 50, 100, and 150 kg ha-1) on the growth and morphological plasticity of junglerice. Junglerice plant height was reduced by 15 to 35%, tiller number by 54 to 77%, leaf number by 61 to 85%, leaf area by 69 to 90%, leaf biomass by 63 to 88%, stem biomass by 70 to 92%, and inflorescence biomass by 66 to 94% at rice planting densities ranging from 100 to 400 plants m-2 relative to the junglerice plants grown alone. However, all these growth parameters increased with increasing N rates. Junglerice biomass increased by 125 to 472%, whereas rice biomass increased by 122 to 285% with the application of 50 to 150 kg N ha-1. Additional N favored junglerice biomass production relative to rice. Rice crop interference (200 to 400 plants m-2) reduced junglerice growth and biomass and overshaded the junglerice plants when no N was applied. Increasing N application resulted in taller plants and higher biomass of junglerice, while it reduced root-shoot weight ratio. These results suggest that increasing N rate increased the competitive ability of the junglerice over rice regardless of crop planting density. Information generated in this study could be useful in devising appropriate combinations of planting density and fertilizer management strategies for cultural junglerice management, particularly in situations where junglerice species are more responsive than rice to N.
Keyword Aboveground biomass
Biomass partitioning
Rice–junglerice competitiveness
Rice seeding density
Root biomass
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
Queensland Alliance for Agriculture and Food Innovation
 
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Created: Fri, 19 Dec 2014, 13:19:46 EST by Bhagirath Chauhan on behalf of Centre for Plant Science