تأثير فوهة الرش و ضغط التشغيل في مكافحة الأدغال المرفقة لمحصول الحنطة

Abstract EN

An Experiment was conducted to study the effect of the spray nozzle and operating pressure on weeds control accompanying with wheat crop, at the experimental field of the College of Agriculture /University of Baghdad, about 20 km west of the Baghdad city during the winter season of 2013-2014 .

pallas45 herbicide, three levels of operating pressure included 2.3 and 4 bar represented main plot, and three types of spray nozzles included Hollow Cone Nozzle, Flat fan 11004 Nozzle and Turbo TT11005 Nozzle which represented sub plot were used in this study The indicators that were studied in this experiment included: droplet size in terms of volumetric median diameter (VMD) (micron), coverage (drop / cm 2), the percentage of weed control after 4 weeks of application (%), and wheat yield (t / ha).

The experiment was designed according to split plot design under randomized complete block design (RCBD) with three replications.

The least significant differences (L.S.D) at 0.05 levels to compare the means of treatments were used in this study.

The results can be summarized as follow Turbo TT11005 nozzle was superior on Flat fan 11004 nozzle and Hollow cone nozzles sequentially characteristics: volume median diameter (VMD) 353.72 micron, the percentage of the weed control 82.95%, wheat crop 4.26 t / ha either coverage, hollow cone nozzle where superior on the Flat fan 11004 nozzle and Turbo TT11005 nozzle sequentially, 167.28 drop / cm 2 .

Increasing the operating pressure from 2 bar - 3 bar - 4 bar caused decreasing in the volume median diameter (VMD) 166.33 micron, and to increasing in the coverage 169.89 drop / cm 2, the percentage of weeds control, 76.29%, wheat crop 4.21 t / ha.

Overlap between the nozzle type and pressure was significant effect.

the overlap between Turbo TT11005 nozzle and (4 bar) pressure was superior in the percentage of weed control 96.25%, wheat crop 4.35 t / ha.

while the overlap between Turbo TT11005 nozzle and (2 bar) pressure was superior in volume median diameter, 412.50 micron.

The overlap between Hollow Cone Nozzle with (4 bar) pressure was superior in the coverage217.66 drop / cm 2 .