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• Allelopathic Potential of Boehmeria nivea (L.) Gaudich. against the Growth of Barnyardgrass (Echinochloa crus-galli)in Laboratory and Nethouse Conditions

  Phan Trung Thang, Nguyen Van Vien, Khuat Huu Trung, Tran Dang Khanh

  Received: 31-12-2019 / Accepted: 14-02-2020

   Abstract PDF (VIETNAMESE)

  The objective of this study was to evaluate allelopathic potential of Boehmeria nivea (L.) Gaudich. against the growth barnyardgrass (Echinnochloa crus-galli) in the laboratory and nethouse conditions. In the laboratory condition, the results showed that the powder of Boehmeria nivea (L.) Gaudich. leaves and stems caused the allelopathic effects on the growth of indicator plants (rice and barnyardgrass). Barnyardgrass biomass and water absorbance were significantly inhibited by the powder ofBoehmeria nivea (L.) Gaudich. leaves and stems. In the nethouse condition, the growth of barnyardgrass was extremely reduced by the effects of powder from Boehmeria nivea (L.) Gaudich. leaves and stems. In the case of increasing the application dose of the powder from 6,2 to 50 g/L. stems, the average inhibition on barnyardgrass was increased from 36.75% to 64.56%. Similar to Boehmeria nivea (L.) Gaudich. leaves, the emergence and dry weight of barnyargrass were significantly decreased from 35,83% to 67,91%. As the result, Boehmeria nivea (L.) Gaudich. indicated a high allelopathic potential to control paddy weeds.

• Evaluation of the Allelopathic Potential of Love Grass (Chrysopogon aciculatus (Retz.) Trin.) Among the Different Screening Conditions

  Phan Trung Thang, Nguyen Van Vien, Nguyen Thanh Nhung, Nguyen Ha Trang Linh, Tran Dang Khanh

  Received: 03-03-2021 / Accepted: 21-10-2022

   Abstract PDF (VIETNAMESE)

  Love grass, Chrysopogon aciculatus(Retz.) Trin., is a perennial grass of the family Poaceae. In this study, the allelopathic potential of this grass was evaluated in different screening conditions. In bioassay, the seedlings of barnyardgrass, rice and mung bean were significantly inhibited at the concentration of 50 g/l of love grass powder;the average inhibition was 56.86%, 52.61% and 46.24%, respectively. Especially, the root growth of the indicator plants was remarkably suppressed. In net house conditions, the germination rate and shoot length of barnyardgrass were inhibited compared with the control treatments. Application of 200 g/m2of the lovegrass powder, the average inhibition was the highest by 42.14%. In the field trial condition, the biomass (fresh weight and dry weight) of barnyardgrass was significantly suppressed which was similar to the net house condition. The highest average inhibition was 37.6%. Moreover, applying 200 g/m2of C. aciculatuspowder reduced the biomass of weeds and simultaneously increased rice yield compared with the control.