Effects of reduced doses of Trifluralin on the development of Redroot pigweed [<em>Amaranthus retroflexus</em> L. (Amaranthaceae)]

Abstract

This study was conducted to determine the minimum dose of pre-emerging herbicide: trifluralin giving satisfactory control efficacy (>90%) on Redroot pigweed (Amaranthus retroflexus L.). Experiments were conducted in plastic pots kept in controlled greenhouses. 100, 80, 60, 40, 20 and 0 (control) % of the registered dose of trifluralin were tested. Plant heights, number of leaves and herbicide symptoms measured at 1st, 3rd, 5th, 7th, 14th, 21st and 28th days. At the 28th day plants were cut at soil surface, thus fresh and dry weights were determined. Dry weight data of the experiments were subjected to nonlinear regression analyses and the effective dose of tifluralin causing 90% reduction in dry weight (ED90) were estimated. Results indicated that 663.97 g a.i. ha-1 trifluralin gives 90% reduction in dry weight of A. retroflexus.

Keywords

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Trifluralin’in azaltılmış dozlarının Kırmızı köklü tilki kuyruğu [Amaranthus retroflexus L. (Amaranthaceae)]’nun gelişimine etkisi

Abstract

Bu çalışma, ekim öncesi kullanılan bir herbisit olan trifluralin'in, Kırmızı köklü tilki kuyruğu (Amaranthus retroflexus L.)'nun mücadelesinde >%90 başarı sağlayan minimum dozunu belirlemek amacı ile gerçekleştirilmiştir. Sera koşullarında, saksılarda yapılan araştırmalarda trifluralin'in önerilen dozunun dışında, %80, %60, %40, %20 ve %0 (kontrol) oranındaki azaltılmış dozları uygulanmıştır. Denemelerin kurulmasını takip eden 1, 3, 5, 7, 14, 21 ve 28'inci günlerde bitki boyları, yaprak sayıları ve bitkide görülen herbisit simptomları kaydedilmiştir. Denemeler 28'inci günde sonlandırılmış, bitkiler hasat edilerek yaş ve kuru ağırlıkları belirlenmiştir. Çalışmalar sonucunda elde edilen bitki kuru ağırlıkları kullanılarak doz-tepki eğrileri çizilmiş ve bu eğriler yardımı ile A. retroflexus'un mücadelesinde %90 (ED90) oranında başarı sağlayan herbisit dozu belirlenmiştir. Yapılan çalışmalar sonucunda, A. retroflexus'un ekim öncesi mücadelesinde 663.97 g e.m. ha-1 trifluralin'in %90 oranında kontrol sağlayacağı belirlenmiştir.

Keywords

• Trifluralin, doz-tepki eğrisi, minimum doz, ekim öncesi herbisit

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