Effects of water regime, nitrogen fertilization, and rice plant density on growth and reproduction of lowland weed Echinochloa crus-galli

Chauhan, Bhagirath Singh and Abugho, Seth Bernard (2013) Effects of water regime, nitrogen fertilization, and rice plant density on growth and reproduction of lowland weed Echinochloa crus-galli. Crop Protection, 54 142-147. doi:10.1016/j.cropro.2013.08.005


Author Chauhan, Bhagirath Singh
Abugho, Seth Bernard
Title Effects of water regime, nitrogen fertilization, and rice plant density on growth and reproduction of lowland weed Echinochloa crus-galli
Formatted title
Effects of water regime, nitrogen fertilization, and rice plant density on growth and reproduction of lowland weed Echinochloa crus-galli 
Journal name Crop Protection   Check publisher's open access policy
ISSN 0261-2194
1873-6904
Publication date 2013-12-01
Sub-type Article (original research)
DOI 10.1016/j.cropro.2013.08.005
Volume 54
Start page 142
End page 147
Total pages 6
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Subject 1102 Cardiovascular Medicine and Haematology
Formatted abstract
Direct-seeded rice systems are increasing in Asia as farmers respond to the high labor cost and shortage of water. Echinochloa crus-galli is one of the most problematic and competitive weeds in direct-seeded rice systems. Because of concerns about excessive herbicide use, there is an interest in developing cultural weed management strategies. However, the design of such strategies requires a better understanding of the weed response to crop density, nutrition, and water regime. A study was therefore conducted in pots to determine the effect of water (flooded and aerobic), nitrogen (N) fertilization (0, 100, and 200kgNha-1), and rice density [0, 4 rice plants (≈20kgseedha-1), and 16 rice plants (≈80kgseedha-1)] on the growth and reproduction of E.crus-galli. When grown alone, the growth and seed production of E.crus-galli were higher in flooded conditions than in aerobic conditions. However, no such differences were observed when E.crus-galli was grown with rice interference. E.crus-galli growth and seed production increased with increases in N rate. Irrespective of water regime and N rate, the growth and seed production of E.crus-galli declined with increases in rice density. At 100kgNha-1, for example, E.crus-galli shoot biomass and seed production decreased by 84-86% and 82-87%, respectively, when grown with 16 rice plants compared with its growth without rice interference. The results suggest that growth and seed production of E.crus-galli can be greatly reduced by increasing rice seeding rate. However, there is a need to involve other weed management strategies to achieve complete control of E.crus-galli and other weed species. 
Keyword Aerobic rice system
Crop interference
Leaf area
Weed competition
Weed management
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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