Effect of the use of winter cover plants on weeds in pistachio (Pistacia vera L.)

In this study, the effectiveness of cover crop application methods on the control of problematic weeds in pistachio orchards was investigated. In the study carried out in two different pistachio gardens for 15-20 years in Köprüçay village of Pervari district of Siirt province, the cover crops Common vetch (Vicia sativa L), fodder pea (Pisum sativum spp. arvense L.), damson (Lathyrus sativus L.) were used in the rows. Nine different cover crops, including vetch (Vicia narbonensis L.), sainfoin (Onobrychis sativa), barley (Hordeum vulgare L.), bread wheat (Triticum aestivum L.), triticale (Triticale), einkorn wheat (Triticum monococcum). application has been made. A weedy parcel was created for control purposes. In the experiment, the effect of cover crops on the coverage area (%), density (number/m2) of weeds was determined. 14 weed species, 10 dicotyledonous and 4 monocotyledonous, were found in the gardens where the experiment was conducted. The average values of cover crop cover area according to applications are common vetch % 84,6, bread wheat % 81,28 and triticale % 80,20. Their densities are barley 310 plants/m2, bread wheat 300 plants/m2, and triticale 245 plants/m2. The average values of weed coverage area according to applications are barley % 4,84, common vetch %5,91 and triticale % 6,57. Weed densities were determined as bread wheat 0,29 plants/m2, barley 0,32 plants/m2, triticale 0,33 plants/m2 and common vetch 0,33 plants/m2.