Ecophysiology of corn(Zea mays L.)competition with [Common lambsquarters( Chenopodium album L.)] and [Redroot pigweed (Amaranthus retroflexus L.)] weeds under low input and high input conditions.
2005
Zand, Eskandar, Iranian Research Institute of Plant Protection
During 2002-2003, a field trail was conducted at Karaj Weed Research Station, Plant pests ; diseases Research Institute, Iran. The experiments were carried out in split factorial design with four replicates. Irrigation with 7 and 14 days interval was mail plot and two level of nitrogen application, including recommended and 50% of recommended, and the interaction of corn with weeds on sowing rows were considered as factorial treatment in sub plot. Corn and weed interaction were: Corn alone, 15 plant of redroot pigweed, 15 plant of lambs-quarters, corn+15 plant of redroot pigweed, corn+15 plant of lambs-quarters and corn+7.5 plant of redroot pigweed +7.5 plant of lambs-quarters, all per meter. Analysis of data showed that planting corn alone resulted to the highest yield. Competition of redroot pigweed with corn was higher than of lambs-quarters. Interference of both weeds together with corn at lower application rate of N-fertilizer and shorter interval of irrigation, resulted in the lowest yield. Taken together, the results indicate that in fertile condition, these weeds grow better and achieve higher competition potential.
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