Competitive ability of barley varieties and weeds in agrophytocenosis
2003
Malecka, S. (State Stende Plant Breeding Station (Latvia))
The field trial with spring barley was carried out on sod-podzolic loamy soil in State Stende Plant Breeding Station. The spring barley varieties 'Abava', 'Rasa', 'Sencis' were grown in the years 1995-1997. NPK (18:9:9) was used as basic fertilizer at the rate of 330 kg ha*[-1). The spring barley 'Ansis' was grown in 2001-2002. The rates of NPK fertilizer were 330, 500, and 667 kg ha*[-1) (18:9:9). Number of short-lived dicotyledonous weed plants was recorded in 1995-1997 at the following stages of plant growtn (GS): GS 26-29, 31-33 and 90-92. In 2001-2002, amount of weeds was estimated at GS 26-29 and 50-54. Most frequently existing weed plant species found in barley plantings were: Thlaspi arvense L., Capsella bursa pastoris (L.) Medicus, Chenopodium spp., Stellaria media (L.) Vill, Matricaria inodora L., Galeopsis spp., Viola arvensis Murr., Lamium spp., Polygonum convolvulus L., etc. Results showed that weed density was high in barley fields increasing from 161 to 217 plants per square m. The greatest weed decrease (48.9%) was found in the barley 'Rasa' field.
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