جستجوی مقالات مرتبط با کلیدواژه « butyl » در نشریات گروه « زراعت »

In order to evaluate the effect of herbicides on weed management and grain yield of rice genotypes, an experiment was conducted at Rice Research Institute of Iran in Rasht during 2016-17 cropping season. The experiment was laid out in a split plot based on randomized complete block design with three replications. The treatments included five levels of weed management as 1- sequential application of pendimethalin followed by bensulfuron-methyl followed by cyhalofop- butyl; 2- pretilachlor fb bensulfuron- methyl fb cyhalofop-butyl; 3- pendimathelin fb bensulfuron- methyl fb propanilﺗ 4- pretilachlor fb bensulfuron- methyl fb propanil) and 5- weedy check under natural weed flora as the main plots and ten rice genotypes as subplots. The results showed that the effects of genotype, weed management and their interaction was significant on all traits including weed biomass, plant height, yield components and grain yield of rice. Rice genotypes showed different responses in terms of evaluated traits at each level of weed management, which may be related to different competitive ability of genotypes. All herbicide treatments significantly reduced the weed biomass and increased grain yield of all genotypes compared with weedy checkﺗ however sequential application of pretilachlor followed by bensulfuron- methyl followed by propanil is the best herbicide combination because of the least weed biomss and highest weed control efficiency and also the highest grain yield in all genotypes. It seems that this combination of herbicides can be a good alternative for hand weeding in order to reduce labor costs and more economical production of rice.

A pot experiment was conducted at research greenhouse of Khorasan-Razavi Agricultural Research Center during 2010-2011 to investigate possible management methods of Vetiver grass. The experiment was laid out in a randomized complete block designs with eight treatments and four replications. The treatments were consisted of application of glyphosate at doses of 0, 2.46, 3.28 and 4.10 gha-1 plus 2% (v/v) ammonium sulfate, haloxyfop-R-methyl, cycloxidim, sethoxydim and fulazifop-p-butyl each one at recommended dose for most perennial narrow-leaved weeds. Vetiver plants were exposed to herbicides at early growth stage after emergence. Root and shoot dry matter as well as fresh weight were recorded five times during vegetative plant growth stage. The results showed that cycloxidim and glyphosate could control plant growth even at its lowest dose. Although haloxyfop could significantly reduce plant dry matter after application however the plant could recover later on during growing season. No significant difference was observed among sethoxydim, fluazifop and check treatment.