Aclonifen Uygulama Zamanının Tilki kuyruğu [Alopecurus myosuroides Huds. (Poaceae)] Yapraklarındaki Kritik Konsantrasyon Değerine Etkisi

Bu çalışma, çıkış öncesi ve çıkış sonrası kullanılan bir herbisit olan aclonifenin farklı uygulama zamanının tilki kuyruğu (Alopecurus myosuroides Huds.) mücadelesinde %100 başarı sağlayan Kritik Konsantrasyon Değerlerine olan etkisini belirlemek amacıyla gerçekleştirilmiştir. A. myosuroides bitkileri sera koşullarında, saksılarda yetiştirilmiştir. Araştırmalarda, bitki bünyesindeki herbisit konsantrasyonunu hassas bir şekilde ölçmek için aclonifen süspansiyon konsantre (SC) formülasyonu Challenge 600e 14C-aclonifen ilave edilmiş ve önerilen doz (270 g e.m. da-1 ) uygulanmıştır. Ekimler 2011 Mart-Nisan aylarında yapılmış, denemelerin kurulduğu ilk gün çıkış öncesi, takip eden 20inci gün erken çıkış sonrası ve 40ıncı gün geç çıkış sonrası uygulama yapılmıştır. Uygulamaları takip eden 10uncu gün, bitkilerde görülen herbisit belirtileri gözlemlenmiş; yaprak yaş ve kuru ağırlıkları kaydedilmiştir. Sıvı sintilasyon cihazı kullanılarak her bir bitki yaprağındaki toplam radyoaktivite miktarı dpm cinsinden ölçülerek, aclonifen konsantrasyonu belirlenmiştir. Deneme bulguları, aclonifenin önerilen dozunun A. myosuroides yapraklarında belirlenen aclonifen kritik konsantrasyonu çıkış öncesi için 1,58 ± 0,15 nmol/mg kuru ağırlık, erken çıkış ve geç çıkış sonrası uygulamalarında ise sırasıyla, 3,04 ± 0,27 ve 0,94 ± 0,15 nmol/mg kuru ağırlıktır. Deneme sonuçları, aclonifenin önerilen dozu ile hem çıkış öncesi hem de A. myosuroidesin 1-2 yapraklı evresine kadar yapılacak erken çıkış sonrası uygulamalarında %100 oranında kontrol sağladığı, fakat bitkinin 3-4 yapraklı evresinden sonra yapılan uygulamalarda bitki gelişimini yavaşlatmasına rağmen etkisiz olduğu saptanmıştır.

The Effects of Aclonifen Treatment Times on the Critical Concentration Values in The Leaves of Blackgrass [Alopecurus Myosuroides Huds. (Poaceae)]

The objective of this study was to determine the effect of different treatments times of aclonifen, which is used as pre- and post-emergence herbicide in the control of blackgrass [Alopecurus myosuroides Huds. (Poaceae)] on the critical concentration values resulting in 100% success. The plants of A. myosuroides were grown on pots under greenhouse conditions. In the study, to determine the herbicide contraction on the plant tissues accurately, 14Caclonifen was added to the aclonifen suspension concentrate (SC) Challenge 600 and suggested dose (270 g e.m. da-1 ) was treated. The trials were initiated in march and april of 2011 and the treatments were applied the first (pre-emergence), 20th (early post-emergence) and 40th (later post-emergence) days. 10-day after each treatment, the symptoms were evaluated; and, the fresh and dry weights of the leaves were recovered. The aclonifen concentration on the fresh and dry leave samples were determined by the measuring the total radioactivity amount in dpm using liquid scintillation analyzer. The results of the trials indicated that the suggested doses of aclonifen critical concentration on the A. myosuroides leaves were: 1.58 ± 0.16 nmol/mg dry weight for pre-emergence; 3.04 ± 1.57 and 0.94 ± 0.81 nmol/mg dry weight for early and late post-emergence, respectively. It was also determined that the treatment of aclonifen with suggested dose when applied either as pre-emerge or as early post emergence until the plants reach 1-2 leaf stage before emergence or until 1-2 leaf stage result in 100% control; however, the treatments applied after 3-4 leaf stage are not successful although they result in delays of plant development.

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