EFFECT DIFFERENT METHODS OF APPLICATION AND DOSES OF GLYPHOSATE ON CONTROL Imperata cylindrica L. GROWN INNEW POME GRANT ORCHARD

Abstract

 A field experiment was carried out in Diyala province / Al-Muqdadiya  district during growing season 2011-2012.The aim of present study was to control  Imperata cylindrical L. grown in pomes grant  orchard   using  glyphosate in two application methods, first by knapsack spryer in rate (1.8kg ai/ h) and the second use rope-wick wiper technique in different rate (1 L herbicide  diluted with water  from 1- 6 L ). The experiment was set out as factorial design in randomized  complete block design with three replicates. The results showed superiority T2(1:1 )(herbicide: water ) in killing degree up 6.24 ,and  T2(1: 1herbicide : water) and T3 (1:2 herbicide : water) gave  less average in  percentage of  regrowth  caused and go we  8.16,7.87 respectively Time periods 60 and 90  day after control high killing  degree up 5.02 , 5.03 and reduce percentage of regrowth up to 6.45 ,6.68 respectively .Moreover the efficacy of glyphosate  in weed continue until 360 day after application . as well  caused  significant effect  in reducing  height  Imperata  cylindrica  L.  the T5(1:4 herbicide : water ) gave less height 74.33cm. and T2,T4,T5 gave reduction in  dry weight 127.00,125.67and 129.67 gm/m², respectively. T4 gave less dry weight of rhizomes 141.33 gm/m², and  with  wipe technique get good  and satisfactory result specially  T2(1:1 herbicide : water ) which gave 68.11 % control compared with T8 (1.8kg ai/ h)as application  spray 49.62%.