Pengaruh Dosis Herbisida Glifosat terhadap Pertumbuhan Gulma Centotheca lappacea pada Perkebunan Kelapa Sawit

Abstract

RONY PRANS ANTONIUS SIMANJUNTAK. Pengaruh Dosis Herbisida Glifosat terhadap Pertumbuhan Gulma Centotheca lappacea pada Perkebunan Kelapa Sawit. Dibimbing oleh HARIYADI.

Centotheca lappacea merupakan gulma golongan rumput yang banyak ditemukan di perkebunan kelapa sawit dan berpotensi menurunkan pertumbuhan tanaman akibat persaingan dalam memperoleh air, unsur hara, cahaya, dan ruang tumbuh. Penelitian ini bertujuan mengetahui pengaruh berbagai dosis herbisida glifosat terhadap pertumbuhan gulma Centotheca lappacea serta menentukan dosis yang paling efektif dalam menekan biomassa gulma. Penelitian menggunakan Rancangan Acak Kelompok (RAK) dengan empat perlakuan, yaitu D0 (kontrol), D1 (3 L ha?¹), D2 (5 L ha?¹), dan D3 (6 L ha?¹), masing-masing diulang tiga kali. Parameter yang diamati meliputi analisis vegetasi, bobot basah gulma, dan efektivitas penekanan biomassa. Data dianalisis menggunakan analisis sidik ragam (ANOVA) pada taraf nyata 5%. Hasil penelitian menunjukkan bahwa perbedaan dosis herbisida glifosat tidak memberikan pengaruh yang nyata terhadap bobot basah gulma Centotheca lappacea pada 6 minggu setelah aplikasi. Berdasarkan efektivitas penekanan biomassa, dosis 5 L ha?¹ (D2) memberikan nilai tertinggi sebesar 7,22%, diikuti dosis 3 L ha?¹ (6,19%), sedangkan dosis 6 L ha?¹ menghasilkan nilai -20,62%.

Kata kunci: biomassa gulma, Centotheca lappacea, dosis herbisida, glifosat

RONY PRANS ANTONIUS SIMANJUNTAK. The Effect of Glyphosate Herbicide Dosage on the Growth of Centotheca lappacea. Supervised by HARIYADI.

Centotheca lappacea is a grass weed commonly found in oil palm plantations and has the potential to reduce crop growth due to competition for water, nutrients, light, and growing space. This study aimed to evaluate the effect of different glyphosate herbicide doses on the growth of Centotheca lappacea and to determine the most effective dose for suppressing weed biomass. The experiment was arranged in a Randomized Complete Block Design (RCBD) with four treatments, namely D0 (control), D1 (3 L ha?¹), D2 (5 L ha?¹), and D3 (6 L ha?¹), each replicated three times. The observed parameters included vegetation analysis, fresh weed biomass, and weed biomass suppression efficiency. Data were analyzed using analysis of variance (ANOVA) at a 5% significance level. The results showed that different glyphosate doses had no significant effect on the fresh biomass of C. lappacea at 6 weeks after application. However, based on weed biomass suppression efficiency, the 5 L ha?¹ dose (D2) produced the highest suppression efficiency (7.22%), followed by the 3 L ha?¹ dose (6.19%), whereas the 6 L ha?¹ dose resulted in a negative efficiency (-20.62%).

Keywords: Centotheca lappacea, glyphosate, herbicide dose, weed biomass suppression