Fatemeh Ghasemi; Weria Weisany; Marjan Diyanat; Mahmood Moradi
Abstract
The use of densitiy and cultivars that have high competitiveness are effective ways to control weeds in the integrated management system. The present study aims at increasing competitive ability of some dryland chickpea cultivars against weeds under different plant densities. Therefore, an experiment ...
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The use of densitiy and cultivars that have high competitiveness are effective ways to control weeds in the integrated management system. The present study aims at increasing competitive ability of some dryland chickpea cultivars against weeds under different plant densities. Therefore, an experiment has been conducted as a split factorial in a Randomized Complete Block Design with four replications in the research farms of the Kurdistan Agricultural and Natural Resources Research and Education Center, Garizeh Agricultural Research Station, Sanandaj, Iran, during the 2020-2021 growing seasons. Experimental treatments include different plant density (30, 36, and 42 plants.m-2) as main plot, seven cultivars (Azad, Jam, Hashem, ILC482, Pirooz, Kaka, and a local variety), and weed management (no weeding and hand weeding during the whole growing season) as subplots. Results indicate that weeding operations are effective in increasing the number of pod per plant by 35.63%. Also, it is observed that there have beem significant differences among yield and yield components of the studied cultivars. ILC482 and Kaka cultivars have had the highest and lowest number of main branches at 3.82 and 2.58 values, respectively. The highest number of secondary branches obtained at a density of 30 plants.m-2. Furthermore, the highest number of pods per plant registered for Pirooz and Jam cultivars and the lowest number of pods per plant has been 7.98 in Hashem cultivar. The highest grain yield, indices of tolerance and competition and the lowest weed density observed for the Jam cultivar. In all examined cultivars, the number of seeds per square meter, grain yield and ability withstand competition index improve with increasing plant density so that the highest values are achieved at the plant density of 42 plants.m-2.
Esmail Ghorbanpour; Farshid Ghaderifar; Javid Gherekhloo
Abstract
To evaluate the competition effect of velvetleaf on cotton, an experiment was conducted in a completelyrandomized block design with split plot arrangement of treatments with three replications at ExperimentalStation of Gorgan University of Agricultural Sciences and Natural Resources during 2011 growingseason. ...
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To evaluate the competition effect of velvetleaf on cotton, an experiment was conducted in a completelyrandomized block design with split plot arrangement of treatments with three replications at ExperimentalStation of Gorgan University of Agricultural Sciences and Natural Resources during 2011 growingseason. The treatments were three row spacing (20, 40 and 80cm) of cotton (as main plot) and fivedensities (0 (control), 1, 3, 5 and 12 plant per m-2) of velvetleaf (as subplot). The highest cotton height(129.4 cm) was obtained in 80 cm cotton row spacing and weed free condition. Also, maximum cottondry matter (863.8 g m-2) and leaf area index (9.04) was achieved in the plot of 20cm cotton row spacingand weed free condition. Results indicated that row spacing had no significant effect on cotton yieldunder weed free condition. The highest yield (4986.73 kg ha-1) was obtained in 40 cm cotton row spacingand weed free condition. However, results showed that in ultra narrow row, increasing the plant densitylead to increase of the crop ability to resource using in compared with weed and have producedsustainable yield in competition with over weed density in compared with conventional row.
Ebrahim Rais Mohammadi; Hasan Mohammad Alizade; Mohammad Ali Baghestani Meibodi; Mostafa Arab
Volume 13, Issue 1 , August 2011, , Pages 43-54
Abstract
A field experiment was conducted at College of Aburaihan, University of Tehran, Iran in 2007 to evaluate the herbicides efficacy in a marigold nursery to control weeds including annual flowers. Experimental design was a RCBD with total 12 treatments replicated four times. Treatments were trifluralin ...
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A field experiment was conducted at College of Aburaihan, University of Tehran, Iran in 2007 to evaluate the herbicides efficacy in a marigold nursery to control weeds including annual flowers. Experimental design was a RCBD with total 12 treatments replicated four times. Treatments were trifluralin preplant incorporated at two and three Li/ha, trifluralin preplant non incorporated at two and three Li/ha, oxyfluorfen preplant at two and three Li/ha, oxyfluorfen postemergence at two and three Li/ha and cholorothol-dimethyl preplant at 10 Kg/ha, two-times hand weeding, weedy and weed free treatments were also included as control. Application of oxyfluorfen preplant and trifluralin preplant at both rates of two and three Li/ha controlled weeds by 70 percent. This treatment had no phytotoxic effects on marigolds and did not reduce their yields either. Among applied herbicides, application of non-soil incorporated trifluralin treatment compared with treatment of the same soil incorporated with herbicides, due to easier application, indicated its preference and also had no phytotoxic effects on marigold.