Effect of Certain Plant Crude Extracts on the Growth of Upland Rice (Oryza sativa L.)

Abstract

Test of crude extracts of several plant species was conducted in a screen house to determine the best plant species and the most effective concentration of extract for increasing growth of upland rice (Oryza sativa L.) cultivated in Ultisol. The test was done using Nested Design. First factor was sources of extracts: 1) leaves of cassava, 2) leaves of G. linearis, 3) C. asiatica, 4) stem bark of A. scholaris, and 5) fruit pericarp of mangosteen. Second factor was extract concentrations: 0 (control), 25, 50, and 100 mg/L. Applications of crude extract of mangosteen fruit pericarp at concentration 50 mg/L increased fresh weight of roots with the highest average weight 48.33 g, while the control was 13.33 g. However, plant height given extract of mangosteen (50 mg/L) was lower (74.90 cm) compared to the one in control (87.70 cm). On lower (25 mg/L) and higher (100 mg/L) concentrations of mangosteen pericarp extracts, fresh weight of roots tended to be lower than in control. Application of crude extract of C. asiatica at concentration 100 mg/L showed higher plant height with average 79.30 cm than in control 69.60 cm. Application of crude extract of mangosteen fruit pericarp showed the increasing of plant height from two to three weeks after planting, and crude extract of C. asiatica increased the plant height in third weeks after planting.