نتایج جستجو برای: rapistrum rugosum
تعداد نتایج: 114 فیلتر نتایج به سال:
Two-hundred rice farming households from eight lowland villages in North-West Cambodia were surveyed 2020 to determine changes farmers’ knowledge, weed management practices and seed contamination kept for sowing. The major yield constraints cited by farmers lack of water, inability manage water competition weeds. Water shortages result reduced crop establishment, non-optimal herbicide applicati...
ربه منظور بررسی خسارت علف های هرز و تعیین مناسب ترین شاخص برای برآورد کاهش عملکرد گندم در شرایط زراعی، آزمایشی در سال78-1377 در قائم شهر انجام شد. به این منظور 27 نمونه به ابعاد 5*5 متر از سطح مزرعه انتخاب و در چندین مرحله در آن تراکم علف های هرز به تفکیک گونه ها شمارش و در پایان فصل رشد، وزن خشک هر گونه جداگانه اندازه گیری شد. جهت مقایسه ضریب خسارت گونه ها شاخص هایی چون تراکم، وزن خشک در واحد ...
weeds in wheat (triticum aestivum l.) fields have always been a big problem in iran and worldwide and must be managed by non-chemical especially cultural methods. a field experiment as factorial based on a randomized complete block design with four replications in a 1000 m2 field in research farm of shirvan college of agriculture was conducted during 2007-2008. treatments included wheat densiti...
Marine biotoxins are algal metabolites that can accumulate in fish or shellfish and render these foodstuffs unfit for human consumption. These toxins, released into seawater during algal occurrences, can be monitored through passive sampling. Acetone, methanol and isopropanol were evaluated for their efficiency in extracting toxins from algal biomass. Isopropanol was chosen for further experime...
We review the spatial distribution of toxic marine microalgal species and impacts all types harmful algal events (Harmful Algal Blooms, HABs) in Mediterranean Sea (MS), including Black Sea, Marmara, coastal lagoons transitional waters, based on two databases compiled Ocean Biogeographic Information System (OBIS). Eighty-four potentially have been detected MS (2,350 records), which 16 described ...
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