KARAKTERISTIK PERTUMBUHAN JARAK PAGAR PADA MEDIA TANAH BEKAS PERTAMBANGAN BAUKSIT UNTUK PENGEMBANGAN DESAIN PEMBELAJARAN BIOLOGI

Sari

A field research has been conducted to observe the growth characteristics of Physic
Nut (Jatropha curcas L.) cultivated on bauxite mined soil in the Biology Natural
Laboratory, Teacher Training and Education Faculty of the University of Riau,
Pekanbaru. Parameters observed every single week include plant height, stem
diameter, and number of leaves, whereas at the end of the testing carried out
measurements of leaf area, canopy dry weight, and root volume. The pH of the soil
was analyzed at the beginning and at the end of the test, while the temperature and
humidity were analyzed every single week. Growth characteristics were observed
during the 9-week period showed that the average height of Physic Nut plants reach
42,9 cm and the relative growth rate (RGR) 3,40 cm/week. A mean diameter of 1,26
cm rod with RGR 0.33 cm/week. The mean number of leaves around 9,78 cm 2 2,20
RGR strands with strands/week. The total leaf area of Physic Nut directly
proportional to the volume of the dry weight of roots and canopy. The results of non-
experimental studies can be utilized to improve the quality of teaching biology at
Senior High School in the form of Syllabus development, Lesson Plan (LP), Student
Assignment Sheet (SAS) I and II, and Assessment Sheet. The review of the product
design Syllabus, LP, SAS I and II, and Assessment Sheet shows that all the draft
classified Very Good, except for the Syllabus which was considered Good. In order to
find out the plant productivity in bauxite mined soil, the observation period in this
study can be extended to the generative phase. Meanwhile, to ensure the quality of
biology learning design products, the testing steps still need to be followed up to the
stage of Implementation and Evaluation.

Keywords: Bauxite Mined Soil, Vegetative Growth, Jatropha curcas L., Biology
Learning Design, Physic Nut