The purpose of this study was to determine the effectiveness of mixing herbicides with the active ingredients atrazine and topramezone in controlling weeds and to determine the nature of the mixture of the two active ingredients. This research was conducted in a plastic house in Natar District, South Lampung Regency from October 2020 - January 2021. The study was arranged in a Completely Randomized Design (CRD). The treatments consisted of three types of herbicides with six dosage levels of the active ingredients, namely the single herbicide Atrazine 300 g/l (0, 37.5, 75, 150, 300, and 600 g ai ha-1), Topramezon 10 g/l (0. 1.25 , 2.5, 5, 10, and 20 g ai ha-1), and the herbicide mixture of Atrazine 300 g/l + Topramezone 10 g/l (0. 38.75, 77.50, 155, 310, and 620 g ai ha-1) , and repeated 6 times. The target weeds included broadleaf weeds (Ageratum conyzoides and Synedrella nodiflora), grass groups (Digitaria ciliaris, Echinochloa colonum, and Eleusine indica), and the puzzle group (Cyperus iria). The herbicides atrazine and topramezone have different ways of working so that the analytical method used is the Multiplicative Survival Model (MSM) method. The results showed that mixing the herbicide Atrazine 300 g/l + Topramezon 10 g/l had an expected LD50 value of 46.28 g ai ha-1 and a treatment LD50 of 27.22 g ai ha-1 with a co-toxicity value of 1.7 (Co-toxicity > 1) so that it is synergistic.Key words: Atrazin, Topramezon, mixing herbicide, Multiplicative Survival Model, weed, LD50
Tujuan dilakukannya penelitian ini adalah untuk mengetahui efektivitas dari pencampuran herbisida dengan bahan aktif diuron dan hexazinon dalam mengendalikan gulma serta mengetahui sifat campuran kedua bahan aktif tersebut. Penelitian ini dilakukan di rumah plastik Kecamatan Natar, Kabupaten Lampung Selatan dari bulan Mei hingga Juli 2022. Penelitian disusun dalam Rancangan Acak Lengkap (RAL). Perlakuan terdiri dari tiga jenis herbisida dengan enam tingkat dosis bahan aktif, yaitu herbisida tunggal diuron 80% WG (0, 0.25, 0.50, 1.00, 2.00, dan 4.00 kg ha-1), hexazinon 75% WG (0, 0.5, 1.0, 2.0, 4.0, and 8.0 kg ha-1), dan campuran herbisida dari diuron 46,8% + hexazinon 13,2% (0, 0.25, 0.50, 1.00, 2.00, and 4.00 kg ha-1). Gulma sasaran meliputi dua jenis gulma golongan daun lebar (Ageratum conyzoides dan Asystasia gangetica), golongan rumput (Eleusine indica dan Paspalum conjugatum), serta golongan teki (Cyperus kyllingia dan Cyperus rotundus). Herbisida diuron dan hexazinon memiliki cara kerja berbeda sehinggal metode analisis yang digunakan adalah metode Multiplicative Survival Model. Hasil penelitian menunjukkan bahwa pencampuran herbisida diuron 46,8% + hexazinon 13,2% memiliki nilai LD50 harapan sebesar 69,29 g ha-1 dan LD50 perlakuan sebesar 55,77 g ha-1 dengan nilai ko-toksisitas sebesar 1,24 (ko-toksisitas > 1) sehingga campuran bersifat sinergis.
The aimed of this research was to know the effectiveness of mixing herbicides with active ingredient atrazin and mesotrion in controlling weeds (0, 76, 152, 304, 608, and 1.215 ha g -1 ), mesotrion 50 g l -1 (0, 11, 22, 43, 86, and 172 g ha -1 ), and mixed herbicides from atrazin 500 g l -1 + mesotrion 50 g l -1 (0, 28, 56, 112, 225, and 450 g ha -1 PENDAHULUANHerbisida merupakan bahan kimia yang dapat digunakan untuk mengendalikan pertumbuhan gulma karena dapat mematikan pertumbuhan atau menghambat pertumbuhan normalnya (Tjitrosoedirdjo et al., 1984). Penelitian mengenai herbisida kimia telah dimulai pada awal abad ke-20 dengan herbisida pertama yang disintesis adalah 2,4-D (Wikipedia, 2014). Karena sifat dari herbisida yang efektif, selektif, dan sistemik maka petani dengan cepat menerima penggunaan herbisida dalam kegiatan pengendalian gulma (Sembodo, 2010). Namun pemakaian herbisida yang terus-menerus
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