Electronic Theses and Dissertation

RINGKASAN

Pencampuran herbisida dengan bahan aktif yang berbeda bertujuan untuk mendapatkan spektrum pengendalian yang lebih luas, serta diharapkan dapat memperlambat tumbuhnya gulma yang resisten terhadap herbisida. Penelitian ini bertujuan untuk mengetahui pengaruh campuran herbisida clomazone, oksifluorfen dan pendimethalin terhadap pertumbuhan dan hasil tanaman kedelai. Penelitian ini dilaksanakan di Desa Blang Krueng, Kecamatan Baitussalam, Aceh Besar dan Laboratorium Pengelolaan Gulma, Fakultas Pertanian, Universitas Syiah Kuala, Banda Aceh. Penelitian ini dilaksanakan sejak Desember 2023 sampai dengan April 2024. Alat-alat yang digunakan yaitu hand tractor, cangkul, knapsack sprayer berukuran 15 L, spet suntik 1 dan 5 ml, gembor, selang air, oven, grain moisture meter, dan timbangan digital. Bahan-bahan yang digunakan dalam penelitian ini adalah benih kedelai varietas Devon 1 yang diperoleh dari Balai Pengujian Standar Instrumen Tanaman Aneka Kacang Malang, herbisida clomazone, oksifluorfen dan pendimethalin, pupuk urea, TSP, dan KCl, rhizogen, insektisida karbofuran dan deltametrin. Penelitian ini menggunakan Rancangan Acak Kelompok pola non faktorial yang terdiri dari 8 perlakuan dan 3 ulangan sehingga diperoleh sebanyak 24 unit percobaan. Adapun perlakuan yang digunakan terdiri dari kontrol, clomazone 1 kg b.a ha-1, oksifluorfen 1 kg b.a ha-1, pendimethalin 1 kg b.a ha-1, clomazone 0,5 kg b.a ha-1 + oksifluorfen 0,5 kg b.a ha-1, clomazone 0,5 kg b.a ha-1 + pendimethalin 0,5 kg b.a ha-1, oksifluorfen 0,5 kg b.a ha-1 + pendimethalin 0,5 kg b.a ha-1, clomazone 0,3 kg b.a ha-1 + oksifluorfen 0,3 kg b.a ha-1 + pendimethalin 0,3 kg b.a ha-1. Peubah yang diamati adalah bobot kering gulma, indeks persentase keracunan tanaman, jumlah polong pertanaman, bobot biji per tanaman, bobot 100 butir, jumlah biji per tanaman dan hasil biji kering. Aplikasi campuran herbisida clomazone, oksifluorfen dan pendimethalin berpengaruh nyata terhadap indeks keracunan tanaman pada 1, 2, 3, dan 4 MST. Namun tidak berpengaruh terhadap jumlah polong per tanaman, bobot biji per tanaman, bobot 100 butir, jumlah biji per tanaman, dan hasil biji kering. Keracunan tanaman tertinggi dijumpai pada perlakuan herbisida oksifluorfen dengan dosis 1 kg b.a ha-1.

Mixing herbicides with different active ingredients aims to get a broader spectrum of control, and is expected to slow the growth of herbicide-resistant weeds. This study aims to determine the effect of a mixture of clomazone, oxifluorfen and pendimethalin herbicides on the growth and yield of soybean plants. This research was conducted in Blang Krueng Village, Baitussalam District, Aceh Besar and Weed Management Laboratory, Faculty of Agriculture, Syiah Kuala University, Banda Aceh. This research was conducted from December 2023 to April 2024. The tools used were hand tractor, hoe, 15 L knapsack sprayer, 1 and 5 ml syringe, paddle, water hose, oven, grain moisture meter, and digital scale. The materials used in this study were soybean seeds of Devon 1 variety obtained from the Standard Testing Center for Miscellaneous Bean Crops in Malang, herbicides clomazone, oxifluorfen and pendimethalin, urea, TSP, and KCl fertilizers, rhizogen, carbofuran and deltamethrin insecticides. This study used a non-factorial pattern Randomized Group Design consisting of 8 treatments and 3 replicates so that a total of 24 experimental units were obtained. The treatments used consisted of control, clomazone 1 kg b.a ha-1, oxifluorfen 1 kg b.a ha-1, pendimethalin 1 kg b.a ha-1, clomazone 0.5 kg b.a ha-1 + oxifluorfen 0.5 kg b.a ha-1, clomazone 0.5 kg b. a ha-1 + pendimethalin 0.5 kg b.a ha-1, oxifluorfen 0.5 kg b.a ha-1 + pendimethalin 0.5 kg b.a ha-1, clomazone 0.3 kg b.a ha-1 + oxifluorfen 0.3 kg b.a ha-1 + pendimethalin 0.3 kg b.a ha-1. The observed variables were weed dry weight, plant toxicity percentage index, number of pods per plant, seed weight per plant, 100-grain weight, number of seeds per plant and dry seed yield. Application of a mixture of clomazone, oxifluorfen and pendimethalin herbicides had a significant effect on the plant toxicity index at 1, 2, 3 and 4 weeks after planting. However, it did not affect the number of pods per plant, seed weight per plant, 100-grain weight, number of seeds per plant, and dry seed yield. The highest plant toxicity was found in the oxifluorfen herbicide treatment at a dose of 1 kg b.a ha-1.