Clomazone Aktif Maddesinin Yarı Kurak Koşullarda Geleneksel Pamuk (Gossypium hirsutum L.) Tarlalarında Yabancı Ot Kontrolünde Çıkış Öncesi Herbisitlerle Tank Karışımı

Abstract

One of the critical components of successful cotton production is effective weed management. Since cotton cannot compete sufficiently with weeds, especially in the first six weeks, a certain number of weeds significantly reduces cotton yield. In addition, weeds can make cotton harvest difficult and contaminate cotton fiber. The main preferred control method for broadleaf weeds in the conventional cotton of Turkey (non-tolerant and non-resistant varieties) is the use of pre-emergence herbicides. However, since there is not much information about the effects of mixtures of different pre-planting herbicides, the aim of this study is to evaluate the efficacy and selectivity of herbicides applied as a pre-emergence mixture in cotton. The randomized complete block design (RCBD) with four replications and eleven treatments was used in the field experiment. The plots were established to 20 square meters (4 m x 5 m). Herbicide applications in the study were carried out in Diyarbakir in 2015, and dual mixtures of clomazone, fluometuron, oxyfluorfen, and pendimethalin were used with different mixtures and doses. Clomazone 0.2 l ha-1 + fluometuron 1,5 l ha-1, clomazone 0.2 l ha-1 + fluometuron 2 l ha-1, clomazone 0.4 l ha-1 + pendimethalin 1.5 l ha-1 and clomazone 0.3 l ha-1 + pendimethalin 2 l ha-1 mixture was found to be complete weed control efficiency. This result shows that mixtures with clomazone active ingredient increase in the efficiency of herbicides pre-planting. Oxyfluorfen mixtures showed the most hazardous damage in terms of product selectivity. The highest cotton yield (> 5 t ha-1) was obtained from the application of mixes of clomazone 0.30 l ha-1 + fluometuron 2 l ha-1 and clomazone 0.2 l ha-1 + fluometuron 1.5 l ha-1, respectively.