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Effects of Nitrogen on the Competitiveness of echinochloa colona and Amaranthus viridis with Direct-seeded Rice

Journal of Agricultural Science and Technology 2010年第2期4卷 14-19页

作者： B.S. Chauhan D.E. Johnson Crop and Environmental Sciences Division International Rice Research Institute Los Banos 4031 Philippines

Information on weed competitiveness responses to added nitrogen （N） is required to assist with the development of appropriate fertilizer management strategies where weed competition is anticipated. A greenhouse study was conducted to examine the effects of four N rates on the competitive ability ofechinochloa colona and Amaranthus viridis grown together with direct-seeded rice. Rice and each weed species were grown in a replacement series design at added N rates of 0, 50, 100, and 150 kg ha1. Replacement series diagrams for relative yield showed that competitive ability ofE. colona increased with added soil N. Values of weed aggressivity index for E. colona also significantly increased with the addition of N in the soil. In the absence of added N, A. viridis was more competitive than rice but this relationship slightly changed as N was added. However, values of weed aggressivity index of were statistically similar at all N rates. The results suggest that the competitiveness ofE. colona increased with added soil N, and A. viridis unchanged by soil N levels. Both weed species were different in their response to higher N levels. Information gained in this study could be used to demonstrate the importance of effective weed and fertilizer management.

关键词： Amaranthus viridis direct-seeded rice echinochloa colona nitrogen weed

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