RESPONSE OF ROOTING OF Mucuna bracteata SEEDLING FROM CUTTING AGAINST SUNLIGHT RADIATION INTENSITY

摘要

The aims of this research to determine the response of Mucuna bracteata seedling roots from cuttings to sunlight intensity, including root nodule formation as a morphological parameter of rhizobium activity. The research location has an average rainfall of 1721 mm per year. The temperature at the research location is 24o C to 32o C with air humidity 80% to 85%. This research uses an experimental method with a Split Plot Experimental design with 2 factors. The first factor: intensity of sunlight as the main plot? consists of 3 levels, namely: P0 = 100% radiation intensity; P1 = radiation intensity 75%; P3 = 50% radiation intensity. The second factor:? section of cutting material as a subplot consisting of 3 levels, namely: T1 = 4 th section from base; T2 = 7 th section from base; T3 = 10 th section down from base. Observation variables included: root length (cm), fresh weight of root (g), dry weight of root (g), and number of effective root nodules. The treatment of radiation intensity has a significant effect on the number of effective root nodules. Intensity of sunlight 50% (5.61) and 75% (4.81) is significantly the highest effect on the number of effective root nodules. While for the parameters of root length, fresh weight and dry weight of root, the treatment of sunlight intensity did not have a significant effect between treatments. The cutting material treatment has a significant effect on the root length parameter and the number of effective root nodules. On root length, section 7 th cutting material gave the highest results with an average root length of 18.44 cm. On number of effective root nodule parameter, section 7 th cutting material also gave the highest number of root nodules with an average of 5.67. There is no interaction between the intensity of sunlight and cutting material on the four parameters observed.