Biology

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Browsing Biology by Subject "Ageratum conyzoides"

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    POTENSI KOMBINASI EKSTRAK BASAH DAUN Ageratum conyzoides (L.) Cymbopogon citratus DC DAN Piper betle (L.) DALAM MENGHAMBAT PERKECAMBAHAN DAN PERTUMBUHAN ANAKAN Borreria alata (Aublet) DC
    (2016-01-28) Siagian, Marlyna Renty; Fatonah, Siti; Herman
    Weeds are plants that commonly grow in unnecesary places that may disturb other plants arround it, and may adverse human. One of alternative weed controls in organic farming system is the use of organic herbicides. Potential crop as organic herbicides includes Ageratum conyzoides, Cymbopogon citratus and Piper betle which contain essential oil and alelopat. This study aimed to determine the effect of the extract combination and determine the best concentration combination of A. conyzoides, C. citratus and P. betle extract on the inhibition of germination and growth of Borreria alata. This study used GRD and consisted of five treatments: control, 100 g/L, 200 g/L, 300 g/L and 400 g/L extract combinations, each treatment was repeated three times. The data was analyzed with ANOVA and if the result is significantly different, it is tested with DMRT. The results showed that all of the extract combination treatments were able to reduce the germination and growth of B. alata. The best extract concentration to decrease the germination and seedling growth of weeds was 400 g/L.
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    UJI EFEKTIVITAS BAKTERI PELARUT FOSFAT PENGHASIL ASAM SIANIDA ASAL TANAH GAMBUT RIAU SEBAGAI PENGENDALI GULMA BABADOTAN PADA TANAMAN JAGUNG (Zea mays L.)
    (2016-01-30) Nestika, Revillia; Zul, Delita; Mayta Novaliza, Isda
    This research aims to analyze the effectiveness of Phosphate Solubilizing Bacteria (PSB) which are able to produce cyanide acid (HCN) in controlling of predominant weed in the corn plantation. This research was conducted from September to December 2014 in the Laboratory of Microbiology, Faculty of Mathematics and Natural Sciences, University of Riau. The effectiveness of PSB in controlling the growth of Ageratum conyzoides was performed by inocullating 26-selected PSB isolates into pre-germinated of those weeds based on the Kremer and Soussi with modification. The seed were sterilizedby soaking it in a solution of 95% ethanol before being inoculated with 26- selected PSB isolates. The sterilized seed were pre-germinated on the media of 1% agarose. Seeds which has been germinated were dropped with bacterialsuspension of PSB as much as 1 ml. The parameters observed were root length and shoot length of weed seedlings. The results suggested that all of PSB isolates were generally able to selectively inhibiting the growth of roots and shoots on weeds. Isolates BB-BK4 and BB-HP29 werethe most effective in controlling weed because the percentage of its reduction is 60-80%.