Evaluating the Effects of Atlantis, Granstar and Topic Herbicides and Split of Nitrogen Fertilizer on Controlling Weeds of D79-15 Wheat Conducted In Behbahan City

ABSTRACT:In order to evaluate the effects of Atlantis, Granstar and Topic herbicides and split of Nitrogen fertilizer on controlling weeds of D79-15 wheat, an experiment was conducted in the form of split-plot in randomized complete block design with three replicates in Behbahan during the agronomic year of 2011-2012. In this experiment, the four main factors were including: Atlantis herbicide (H1), Topic and Granstar mixing of toxicants (H2) and not using herbicide (H3). And four different split of Nitrogen fertilizer as secondary factors were: consumption of all fertilizers during the planting stage (N1), consumption of all fertilizers during the tillering stage (N2), ½ distribution of Nitrogen fertilizer during the planting stage – ½ distribution of the rest of fertilizer in tilleringstage (N3), 2/3 distribution of fertilizer during the tillering stage – 1/3 distribution of the rest of fertilizer during the stem elongation stage (N4). The results indicated that the maximum number of weeds with an average of 90 bushes per square meter was in treatment of not using herbicide; and the minimum number of weeds was during the using of Atlantis herbicide. In treatments of split of Nitrogen, the maximum number of weeds with an average of 67 bushes per square meter was in the treatment of distributing all fertilizers during the planting stage; and the minimum number of weeds with 32 bushes per square meter was in the treatment of 2/3 distribution of all fertilizers during the tillering stage and also 1/3 distribution of fertilizer during the stem elongation stage.