Weed infestation degree of barley grown after different predecessors
2006
Saldzhiev, I.
Field trial was carried out to determine the biological group of weed and yield change of barley cultivated after three predecessors - barley monoculture, cotton and sunflower, at five levels of weeding - check zero, check economic, 8 weed plants per m2, 16 weed plants per m2 and 32 weed plants per m2. The following conclusions were made on the basis of the result obtained: total weed infestation after monoculture was 32.4 per m2, 18.2 weed plants per m2 after cotton, and 16.4 number per m2 after sunflower. Losses of yield for variants cultivated on barley monoculture increased from check economic 9.6% (306 kg/ha) to 58.3% (1859 kg/ha) for variant of 32 weed plants per m2, after predecessor cotton the losses increased from 4.7% (239 kg/ha) to 25.5% (1299 kg/ha) and after sunflower - from 5.0% (232 kg/ha) to 30.6% (1414 kg/ha).
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