بررسي كارايي علف كش هاي قديم و جديد در مديريت علف كش هاي هرز مزارع ذرت

Efficacy evaluation of old and new herbicides in weed management of maize fields

In order to efficacy evaluation of old and new herbicides in weed management of maize filed this excrement was conducted in 2007 at researches filed of agriculture department of Azad university branch of Arak. The experimental design was randomized complete block whit 18 treatments. Treatments consisted of a Atrazin (pre plant), Atrazin (pre emergence), Atrazin + 2.4-D +MCPA (post emergence), 2.4-D+MCPA (post emergence), Atrazin + Allacolor (pre plant), Atrazin + Allacolor (pre emergence), Allacolor (pre plant), Allacolor (pre emergence), Rimsulfurone (post emergence), Nicosulfurone (post emergence), Foramsulfurone (post emergence), Boromicide (post emergence), Amicarbasome (post emergence), Allacolor + 2.4-D+MCPA (pre plant + post emergence), Allacolor + 2.4D+MCPA (pre emergence + post emergence), Allacolor + Boromicide (pre plant + post emergence), Allacolor + Boromicide (pre emergence + post emergence) and full season hand remove. Indicators was measured are included: weed biomass and population of weed species 15 and 45 day after herbicide applications and bush height, ear maize number, ear maize on bush, ear maize Wight, seed row in ear maize, seed on row, leant of the seed row in a ear maize, percent of ear maize empty, ear maize diameter, lent of ear maize wood, depth of the seed maize, Wight of the ear maize wood, Wight of on thousand seed and seed yield. Results of this research show that Nicosulforon controlled broad leaves and grass weed satisfactory, highest yield maize seed was related to Nicosoulforon after full season hand remove and lowest yield of seed belongs to2.4-D + MCPA. Totally, Nicosulforon was suitable herbicide in weed management of maize filed in alternation replacement of old herbicide.