Electronic Theses and Dissertation

Ageratum conyzoides L. yang biasa disebut dengan babadotan merupakan tumbuhan yang dapat dijadikan sebagai bioherbisida karena mengandung senyawa alelokimia seperti alkaloid dan terpenoid yang dapat menghambat pertumbuhan gulma. Tujuan penelitian ini yaitu untuk mengetahui pengaruh interval aplikasi ekstrak n-heksana babadotan dan herbisida clomazone terhadap pertumbuhan gulma teki. Penelitian ini dilaksanakan di Laboratorium Ilmu Gulma Depertemen Agroteknologi Fakultas Pertanian USK, Laboratorium Analisis Pangan dan Hasil Pertanian Depertemen Teknologi Hasil Pertanian Fakultas Pertanian USK, Laboratorium Kimia Organik Depertemen Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam USK dan Kebun Percobaan Fakultas Pertanian USK. Penelitian ini berlangsung mulai Desember 2023 sampai Maret 2024. Bahan dasar penelitian yaitu ekstrak n-heksana babadotan, herbisida clomazone dan gulma teki sebagai gulma sasaran. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) pola non faktorial dengan 8 perlakuan, terdiri dari kontrol negatif aquades, kontrol positif clomazone (480g/L b.a ha-1), 1 kali aplikasi ekstrak n-heksana babadotan 20%, 2 kali aplikasi ekstrak n-heksana babadotan 20%, 1 kali aplikasi ekstrak n-heksana babadotan 20% dan herbisida clomazone ½ dosis, 2 kali aplikasi ekstrak n-heksana babadotan dan herbisida clomazone ½ dosis, 1 kali aplikasi ekstrak n-heksana babadotan 20% dan herbisida clomazone ¼ dosis, 2 kali aplikasi ekstrak n-heksana babadotan dan herbisida clomazone ¼ dosis dengan 3 ulangan, sehingga terdapat 24 satuan percobaan. Setiap satuan percobaan terdiri dari 2 unit pot, sehingga di dapatkan 48 unit percobaan. Hasil penelitian menunjukkan bahwa interval aplikasi ekstrak n-heksana dan herbisida clomazone berpengaruh sangat nyata terhadap parameter panjang gulma, jumlah daun, kadar klorofil daun, jumlah umbi, bobot kering tajuk, bobot kering umbi dan persentase pengendalian gulma teki namun bepengaruh tidak nyata terhadap parameter diameter umbi gulma teki. Perlakuan 2 kali aplikasi ekstrak n-heksana babadotan 20% dan herbisida clomazone ½ dosis merupakan perlakuan lebih baik dalam menghambat pertumbuhan gulma teki yang berbeda tidak nyata dengan perlakuan 2 kali aplikasi ekstrak n-heksana babadotan 20% dan herbisida clomazone ¼ dosis dan perlakuan 2 kali aplikasi ekstrak n-heksana babadotan 20% dengan persentase pengendalian gulma berturut-turut 93,93% (kategori efek sangat berat), 86,07% (kategori efek berat) dan 77,03% (kategori efek berat) pada 28 HSA.
Kata Kunci : Ageratum conyzoides L., bioherbisida, clomazone, Cyperus rotundus L., n-heksana.

Ageratum conyzoides L. commonly referred to as Billygoat is a plant that can be used as a bioherbicide because it contains allelochemical compounds such as alkaloids and terpenoids that can inhibit weed growth. The purpose of this study was to determine the effect of the application interval of Billygoat n-hexane extract and clomazone herbicide on the growth of Purple nutsedge weed. This research was conducted at the Weed Science Laboratory of the Department of Agrotechnology, USK Faculty of Agriculture, Food and Agricultural Products Analysis Laboratory of the Department of Agricultural Products Technology, USK Faculty of Agriculture, Organic Chemistry Laboratory of the Department of Chemistry, USK Faculty of Mathematics and Natural Sciences and Experimental Garden of USK Faculty of Agriculture. This research took place from December 2023 to March 2024. The basic research materials were Billygoat n-hexane extract, clomazone herbicide and Purple nutsedge weed as the target weed. This study used a Completely Randomized Design (CRD) non-factorial pattern with 8 treatments, consisting of a negative control of distilled water, a positive control of clomazone (480g/L b. a ha-1), 1 application of 20% Billygoat n-hexane extract, 2 applications of 20% Billygoat n-hexane extract, 1 application of 20% Billygoat n-hexane extract and ½ dose clomazone herbicide, 2 applications of Billygoat n-hexane extract and ½ dose clomazone herbicide, 1 application of 20% Billygoat n-hexane extract and ¼ dose clomazone herbicide, 2 applications of Billygoat n-hexane extract and ¼ dose clomazone herbicide with 3 replications, so there were 24 experimental units. Each experimental unit consisted of 2 pots, resulting in 48 experimental units. The results showed that the application interval of n-hexane extract and clomazone herbicide had a very significant effect on the parameters of weed length, number of leaves, leaf chlorophyll content, number of tubers, crown dry weight, tuber dry weight and percentage of Purple nutsedge weed control but had no significant effect on the diameter parameter of Purple nutsedge weed tubers. The treatment of 2 times application of 20% Billygoat n-hexane extract and ½ dose clomazone herbicide is a better treatment in inhibiting the growth of weed that is not significantly different from the treatment of 2 times application of 20% Billygoat n-hexane extract and ¼ dose clomazone herbicide and the treatment of 2 times application of 20% Billygoat n-hexane extract with the percentage of weed control respectively 93,93% (very heavy effect category), 86,07% (heavy effect category) and 77,03% (heavy effect category) at 28 DAA. Keywords: Ageratum conyzoides L., bioherbicide, clomazone, Cyperus rotundus L., n-hexane.