Electronic Theses and Dissertation

Abstrak. Beberapa herbisida yang digunakan pada tanaman kedelai dalam pengendalian gulma diantaranya herbisida metribuzin dan pendimethalin. Tujuan penelitian ini adalah untuk mengetahui dosis yang tepat pengaplikasian herbisida metribuzin dan pendimethalin terhadap pertumbuhan gulma dan hasil tanaman kedelai. Penelitian ini telah dilaksanakan di Kebun Percobaan 1 dan Laboratorium Pengelolaan Gulma Fakultas Pertanian Universitas Syiah Kuala, yang telah dilaksanakan dari Maret 2025 hingga Juni 2025. Penelitian ini menggunakan Rancangan Acak Lengkap ( RAL ) pola non faktorial yang terdiri dari 7 perlakuan dengan 3 ulangan. Faktor yang diteliti meliputi kontrol, metribuzin 0,5 kg b.a ha-1, metribuzin 1 kg b.a ha-1, metribuzin 1,5 kg b.a ha-1, pendimethalin 0,5 kg b.a ha-1, pendimethalin 1 kg b.a ha-1, pendimethalin 1,5 kg b.a ha-1. Peubah yang diamati meliputi indeks persentase keracunan tanaman, bobot kering tanaman, bobot kering gulma, spesies gulma, individu gulma, persentase penutupan gulma, persentase pengendalian gulma, jumlah polong per tanaman dan jumlah biji per tanaman. Hasil penelitian menunjukkan bahwa dosis herbisida metribuzin dan pendimethalin berpengaruh terhadap indeks persentase keracunan tanaman, bobot kering tanaman, jumlah polong per tanaman, bobot kering gulma, spesies gulma, individu gulma, persentase penutupan gulma dan persentase pengendalian gulma. Hasil penelitian juga menunjukkan dosis herbisida metribuzin 0,5 kg b.a ha-1 berpengaruh terhadap indeks persentase keracunan tanaman, bobot kering gulma, spesies gulma, individu gulma, persentase penutupan gulma dan persentase pengendalian gulma.
Kata kunci: herbisida, kedelai, metribuzin, pendimethalin

Abstract. Some herbicides used on soybean plants for weed control include metribuzin and pendimethalin. The objective of this study was to determine the appropriate dosage of metribuzin and pendimethalin herbicides for weed growth and soybean crop yield. This research was conducted at Experimental Garden 1 and the Weed Management Laboratory of the Fakultas Pertanian, Universitas Syiah Kuala, from March 2025 to June 2025. This research used a Complete Randomised Design (CRD) non-factorial pattern consisting of 7 treatments with 3 replications. The factors studied included control, metribuzin 0.5 kg a.i. ha-1, metribuzin 1 kg a.i. ha-1, metribuzin 1.5 kg a.i. ha-1, pendimethalin 0.5 kg a.i. ha-1, pendimethalin 1 kg a.i. ha-1, and pendimethalin 1.5 kg a.i. ha-1. The variables observed included plant toxicity percentage index, plant dry weight, weed dry weight, weed species, weed individuals, weed coverage percentage, weed control percentage, number of pods per plant, and number of seeds per plant. The results showed that the doses of metribuzin and pendimethalin herbicides affected the plant toxicity index, plant dry weight, number of pods per plant, weed dry weight, weed species, weed individuals, weed coverage percentage, and weed control percentage. The results also showed that the metribuzin herbicide dose of 0.5 kg b.a ha-1 affected the plant toxicity percentage index, weed dry weight, weed species, weed individuals, weed coverage percentage, and weed control percentage. Keywords: herbicide, soybeans, metribuzin, pendimethalin