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Yield evaluation of two wheat cultivars in intercropping system

Wheat cultivars intercropping especially cultivars with different heights may increase yield. This is because of creating wavy canopy and more efficient utilization of environmental resources especially radiation, which increases yield of intercropping, compared to its components in pure stand. In this regard, two wheat cultivars, dwarf MV-17 with height of about 65 centimeters and Alvand variety with the height of 110 centimeters were evaluated in a factorial experiment based on randomized complete block design with three replications. Three densities of lower than optimum, optimum and higher than optimum (450,500 and 550 seed m z) and six sowing ratios of MV-17 to AIvand (0:100, 20:80, 40:60, 80:20 and 100:0) were used in a row intercropping system. The experiment was conducted in Ardabil Agricultural Research Station in 1998. Maximum yield in pure stand for both cultivars was obtained in optimum density, which was 5800 and 6240 kg/ha for MV-17 and Alvand, respectively. The highest amount of LER (1.12) was observed for the sowing ratio of 40:60 and in density of higher than optimum. Yield of this intercropping treatment was 9.13 percent higher than maximum yield obtained from monoculture of tall Alvand cultivar. Superiority of this combination to other intercropping treatments was also shown for other agronomic and competition indices.