Mohsen Feyzolahi; Ali Monsefi; Afrasyab Rahnama; masomeh farzaneh
Abstract
In order to investigate the effects of chemical and integrated weed management on yield and yield components of grain maize and weed population, the study has been conducted as a randomized complete block design with three replications in 2018-19 in Shavar Research Center in Shavar region of Shousha ...
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In order to investigate the effects of chemical and integrated weed management on yield and yield components of grain maize and weed population, the study has been conducted as a randomized complete block design with three replications in 2018-19 in Shavar Research Center in Shavar region of Shousha city. Treatments include unweeded (control), hand weeding, 1.5 liters of atrazine, 1 liter of atrazine + straw mulch, 175 g of ultima, 150 g of ultima + straw mulch, 1.5 liter 2,4-D + MCPA, 1 liter 2,4-D + MCPA + straw mulch, 1.5 liters cruise, and 1 liter of cruise + straw mulch. Results show that the highest grain yield has been obtained in hand weeding treatment as well as 1 liter of cruise + straw mulch by 14.4 and 13.2 t ha-1, respectively. The highest biological yield is recorded in hand weeding treatment (31.5 t ha-1). In case of harvest index, 1.5 liters of cruise show the highest value (55.7%), followed by 1.5 liters of 2,4-D + MCPA and 1.5 liters of atrazine by 53.6% and 47.7%, respectively. In terms of weed population dynamics, hand weeding, and 1 liter of cruise + straw mulch cause the greatest decrease in weed population and dry weight which reduce crop competition and increase productivity. In general, based on the results, the adoption of integrated approaches (chemical + cultural + mechanical) can make a significant contribution to increasing corn yield and reducing environmental pollution.
Ebrahim Mamnoie; Ali Reza Atri
Abstract
In order to study the effect of pendimethalin (Prowl) on weed control of onion (Allium cepa L.) fields, an experiment was carried out in randomized complete block design with four replications, during 2017 in Agricultural Research Center of South Kerman. Treatments included application of pendimethalin ...
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In order to study the effect of pendimethalin (Prowl) on weed control of onion (Allium cepa L.) fields, an experiment was carried out in randomized complete block design with four replications, during 2017 in Agricultural Research Center of South Kerman. Treatments included application of pendimethalin (Prowl) at 3.5, 3, 2.5, 2 L ha-1 (pre-emergence), oxyfluorfen (Goal) at 750 ml ha-1, and repeat 18 day later (post-emergence), oxadiazon (Ronestar) at 3 L ha-1 (per-emergence), oxadiazon at 2 L ha-1 (post-emergence), ioxynil (Totril) at 3 L ha-1 (post-emergence) plus removing narrow leaves weeds by hand, and weed free as control. The highest relative abundance of weed species was Bromus tectorum L., Malva parviflor L., Chenopodium murale L., Anagallis arvensis L, Rumex crispus L. at 39, 17. 12, 9, 8% respectively. The results showed that herbicide treatments had significant effect on weed density and biomass. Applications of pendimethalin at 3.5 L ha-1 reduced biomass of A. arvensis, R. crispus, M. parviflor, B. tectorum, C. murale, and total weed by 100, 92, 91, 82, 77, 79 respectively. Onion yield was 59.95 ton ha-1 and increased by 138% when pendimethalin was applied at 3.5 L ha-1. Therefore, Applications of pendimethalin at 3.5 L ha-1 is recommended in onion fields because of optimum weed control efficiency and increasing yield.
Elham Samadi kalkhoran; Mohammad taghi Alebrahim; Mehdi Mohebodini
Abstract
In order to study the effect of Oxadiargyl (Topstar) reduced dosages efficacy as a postemergence herbicide, on marketable yield, a field experiment factorial was performed besed on randomized complete block design with three replications and potato's cultivar called Agria in the Ardabil Alarog Agriculture ...
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In order to study the effect of Oxadiargyl (Topstar) reduced dosages efficacy as a postemergence herbicide, on marketable yield, a field experiment factorial was performed besed on randomized complete block design with three replications and potato's cultivar called Agria in the Ardabil Alarog Agriculture and Natural Resources Research Station during 2013. Factores were Oxadiargyl dosages with seven levels (0 as weedy, 0.05, 0.1, 0.2, 0.4, 0.6 and 0.8 Lit a.i/ha), and application time of Oxadiargyl at different potato growth stages, in three levels (Potato emergence, Stoloning and Potato tuber bulking) with weed free. Statistical analysis showed that 0.8 Lit a.i/ha Oxadiargyl reduced weed biomass 66.16% and it hadn,t significant with 0.6 Lit a.i/ha. Among application time of Oxadiargyl, potato emergence produced the maximum reduction percentage of weed biomass. The results showed that 0.8 Lit a.i/ha increased percent of medium tuber and total tuber yield 88.21 and 51.59%, respectively and decreased percent of small tuber 45.60 percent. According to the results, maximum percent of large tuber and marketable yield was 0.8 Lit a.i/ha at potato emergence stage.
Faribi Meighani; Ajang Jahedi; Seyed Mohammad Mirvakili; Parviz Shimi; Mohammad Ali Baghestani
Abstract
In order to study of the efficacy of herbicides in weed control of new seeded alfalfa, an experiment was conducted in Hamedan and Yazd cities, Iran during 2009-2010. The treatments were Bentazone (Bazagran) (SL 48%) two, three and four L.ha-1, 2,4-DB (Butress) (EC 42.3%) 2.5, 2.8, 3.1 and 3.5 L.ha-1, ...
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In order to study of the efficacy of herbicides in weed control of new seeded alfalfa, an experiment was conducted in Hamedan and Yazd cities, Iran during 2009-2010. The treatments were Bentazone (Bazagran) (SL 48%) two, three and four L.ha-1, 2,4-DB (Butress) (EC 42.3%) 2.5, 2.8, 3.1 and 3.5 L.ha-1, Imazethapyr (Pursuit) (SL 10%) 0.4, 0.7 and one L/ha and without herbicide control treatment. The herbicides effect on alfalfa biomass and the biomass and density of weeds was studied during three cuttings. In Yazd, 2,4-DB 3.5 L.ha-1 was the best treartment for controlling weeds and increasing alfalfa biomass. 2,4-DB 3.5 and 2.8 L.ha-1 controled the density and biomass of Malva and Lactuca to 100 and 88 percent, respectively. In Hamedan, herbicides treatments had no phytotoxocity on alfalfa. Only Bentazone caused chlorosis in alfalfa that recovered that after one to two weeks. 2,4-DB not only was suitable in control ling broad leaves weeds, but also was successful in field bindweed control. Overall. 2,4-DB seems to be an efficient herbicide