Influence of nitrogen rate on competition between two rice (Oryza sativa L.) cultivars and barnyardgrass (Echinochloa crus-galli (L.) P. Beauv)

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Research Paper 01/04/2013
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Influence of nitrogen rate on competition between two rice (Oryza sativa L.) cultivars and barnyardgrass (Echinochloa crus-galli (L.) P. Beauv)

Hashem Aminpanah
Int. J. Biosci.3( 4), 90-103, April 2013.
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Abstract

The experiment was conducted at Rice Research Station of Tonekabon, Iran to determine the influence of nitrogen (N) rate on competitive ability of two rice cultivars (“Khazar” and “Line843”) against barnyardgrass (BYG). Treatments consisted of a factorial combination of two rice cultivars (a high competitive line: “Line843”, and a low competitive cultivar: “Khazar” cultivar), three N rates (0, 50 and 100 Kg N ha-1) and five rice:BYG ratios (100:0, 75:25, 50:50, 25:75 and 0:100). Treatments were arranged in a randomized complete block design with three replicates. Replacement series curves showed that “Line843” was more competitive than BYG, while “Khazar” was as competitive as BYG. Moreover, the results showed that relative crowding coefficient based on grain yield, root dry weight and tiller number was significantly higher in “Line843” compared to “Khazar” and BYG (interfere with either “Khazar” or “Line843”). On the other hand, different levels of N fertilizer application had no significant effect on competitive ability of “Khazar” and “Line843”. In general, this experiment illustrated that “Line843” was more competitive than “Khazar” cultivar at all N rates and N rate did not influence on competition between rice and BYG.

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