seyedeh roghaye hosseini valiki; Rahmat Abbasi; Hemmatollah Pirdashti; Vahid Akbarpour
Abstract
Weed infestation in arable lands is much more than one species. Thus, it is important to pay attention to the interaction of multy species of weeds. To study the effect of redroot pigweed (Amaranthus retroflexus L.) and barnyardgrass (Echinochloa crus-galli (L.) P. Beauv) interference on yield and essential ...
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Weed infestation in arable lands is much more than one species. Thus, it is important to pay attention to the interaction of multy species of weeds. To study the effect of redroot pigweed (Amaranthus retroflexus L.) and barnyardgrass (Echinochloa crus-galli (L.) P. Beauv) interference on yield and essential oil of fennel (Foeniculum vulgare Mill.), an experiment has been done in Research field of Sari Agricultural Sciences and Natural Resources University during 2017. It has been arranged in a factorial arrangement based on randomized complete block design with three replications with the experimental factors being three densities of redroot pigweed (0, 4, and 8 plants m-2) and three densities of barnyardgrass (0, 4, and 8 plants m-2). The highest grain yield (2230 kg ha-1) and essential oil content (2 %) are obtained at weed free plots. The density of 8 redroot pigweed plants m-2 at simultaneous interference with 0, 4, and 8 barnyard grass m-2 reduce grain yield by 30.1%, 62.9%, and 75.7%, and essential oil content by 24.5%, 26.2%, and 29.5%, respectively, compared with weed free plots. The coefficient of redroot pigweed competitivity is predicted to be higher than barnyardgrass, and the interference of 14.5 barnyardgrass plants m-2 or 7.7 redroot pigweed plants m-2 decreases fennel grain yield by 50%.
maryam sadegh; Faezeh Zaefarian; Vahid Akbarpour; mostafa emadi
Abstract
In order to determine the rosemary (Rosmarinus officinalis L.) dry matter and weeds under different fertilizer sources, an experiment was conducted as a split plot in a randomized complete block design with three replications at Sari Agricultural Sciences and Natural Resources University in 2016. The ...
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In order to determine the rosemary (Rosmarinus officinalis L.) dry matter and weeds under different fertilizer sources, an experiment was conducted as a split plot in a randomized complete block design with three replications at Sari Agricultural Sciences and Natural Resources University in 2016. The treatments consisted of: competition between plants and weeds (weedy check and weed free) as the main factor, and sub factor was fertilizer sources included sheep manure, vermicompost, sheep manure + vermicompost, NPK chemical fertilizer (N 46%, P2O5 46%, K2O 50%), NPK nano fertilizer and control (no fertilizer). The results showed that interference with weeds caused rosemary shift the maximum dry matter to the upper layers of canopy (20-40 cm). While in weed free treatment, rosemary had higher ability and uniformity in dry matter distribution in the two primary canopy layers compared to competition with weeds. In this regard, vermicompost treatment was successful with a mean of 49.51 g plant-1. Studies on density and weed biomass showed that the use of vermicompost (treatment 2) reduced density and biomass of weeds, while the chemical fertilizer caused the highest weed density and biomass. The results showed that the use of organic fertilizers such as vermicompost, not only reduce the use of chemical fertilizers and do not have environmental consequences, but also have the high ability to suppress weeds growth and decrease weed density and biomass.