ادارة انتاج محصول الشعير (صنف أكساد 176) والحشائش المصاحبةله بمنطقة البيضاء

Abstract

Tow field experiments were conducted during the growing seasons 2013/ 2014 and 2014/ 2015 to investigate the effect of sowing time (30 Oct , 10 Nov ; 2,4 Dec and 1 ,13 Jan ) ; Weed control (control , brominal and atlantes) and companion the crop with weeds or without .the result revealed that the physiological characteristics ; leaf area index ,crop groath rata ,light extencion coeffienet light active coefficient , relative growth rate , net assimilation rate .leaf crop dominance , crop canopy dominance .light yield potential , plant height toxicity to herbicides . crop energy consumption , the time of tillering , flowering and ripening were significantly differences, the greast from sowing time 2،4 Dem comparing to 1، 13 Jan and not significanty effect by weed control and the behavior of companion crop . The crop yield and its attributed characteristics showed a significant differences by the factors of this trails that is : plant height (cm) , bearing tillers /m2 , non bearing tillers .the spike length . weight , number and weight of spike grains , the greatest was recorded from 2,4 Dec sowing time and spray of brominal herbicide . The data exhibited highly significant difference in the biological yield in st season only due to sowing time , the largest 5.20 t 1 / ha from 2 Dec and the same for crop yield 2t 1/ ha and no significant differente in both yield due to weed control in both the tow seasons, meanwhile , significant difference was recorded incase of straw yield the bigest 3.12 ، 212 2.74 t 1/ha due to 2 Dec and 13 Jan time of sowing without significant difference in that yield due to weed control in the two seasons of this traits . The weeds dynamic studies concentrated on the abslute weeds speices densities , dominate rate ,% of sp replications. The weeds classification the largest was wild barley foxtail, Aleipogon sp , wild oat , Bromus .sp , wild radish ,and others . The results of weeds dynamic were significantly affected due to state of companion and not effected by sowing time and weed control methods , the companion crop with weed the weed damage rate reduced to 28.41% comparing to brominal 12.79% and atlants 10% in both seasons of this study.