The siam weed (Chromolaena odorata L.) has allelochemical compounds capable in inhibiting the growth of surrounding plants so that it has the potential as a natural herbicide to control various weeds including autoallelopathic weeds. This study aims to examine the effect of siam weed leaf extract at different concentrations on germination and initial growth of the Siam weed seed. The study used a Completely Randomized Design of one factor in the form of extract concentrations of 0%, 5%, 10%, 15%, and 20%. Germination method was carried out on petri dish and observations are carried out every 24 hours, and the treatment was stopped after 100% germination occurred at least in one petri dish. Each treatment was done with five replications — parameters measured as a percentage of germination and germination rate, initial germination including hypocotyl length, radicula length, and fresh weight. Data were analyzed by Analysis of Variance (ANOVA) and continued with Duncan’s Multiple Range Test (DMRT) at 95% confidence level. The results of this study showed that the Siam weed extract inhibited germination and initial growth of the Siam weed seed sprout, the higher concentration of the Siam weed extract the highest, inhibition of germination and initial growth of the Siam weed seed.
Kirinyuh (Chromolaena odorata L.) merupakan salah satu gulma yang memiliki senyawa alelokimia yang dapat menghambat pertumbuhan tanaman yang ada disekitarya, baik yang sejenis maupun yang berbeda sejenis. Karena kemapuan yang dimiliki tersebut, diduga kirinyuh berpotensi digunakan sebagai herbisida alami. Penelitian ini bertujuan untuk mengetahui pengaruh ekstrak air daun kirinyuh pada konsentrasi yang berbeda terhadap pertumbuhan gulma yang sama, yaitu kirinyuh dan menentukan konsentrasi ekstrak air daun kirinyuh yang menyebabkan penghambatan pertumbuhan terbesar pada gulma kirinyuh. Penelitian menggunakan Rancangan Acak Lengkap (RAL) faktor tunggal berupa konsentrasi ekstrak air daun kirinyuh yaitu 0%, 10%, 20%, 30% dan 40%. Masing-masing perlakuan dengan lima ulangan. Parameter yang diamati adalah pertumbuhan vegetative meliputi : tinggi tanaman, panjang akar, bobot basah akar dan tajuk, bobot kering akar dan tajuk, luas daun, jumlah daun, kandungan klorofil a, klorofil b, klorofil total, karotenoid serta lebar mulut stomata. Data dianalisis dengan Analisys of Variance (ANOVA) dan dilanjutkan Duncan’s Multiple Range Test (DMRT) pada taraf kepercayaan 95%. Hasil penelitian menunjukkan bahwa ekstrak daun kirinyuh bersifat autoalelopati yaitu menghambat semua parameter pertumbuhan vegetatif yang diukur, semakin tinggi kosentrasi ekstrak dari 10% sampai 40% penghambatan pertumbuhan semakin kuat. Kata kunci: autoalelokimia, bioherbisida, gulma, kirinyuh, Chromolaena odorata L.
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