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PENGARUH BAHAN ORGANIK DAN TRACE ELEMENTS TERHADAP PERTUMBUHAN DAN KANDUNGAN GULA TANAMAN STEVIA (STEVIA REBAUDIANA BERTONI M.) Lussana Rossita Dewi
Jurnal Matematika Sains dan Teknologi Vol. 14 No. 1 (2013)
Publisher : LPPM Universitas Terbuka

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (116.172 KB)

Abstract

The aims of research was to study the effect of organic material and trace elements added on growth and sugar content of Stevia rebaudiana. The research was designed using Complete Random Design (CRD) consist of 20 factors with 3 repeats. The factors given consist of combination of 0, 0,5, 1, and 1,5 kg of organic material, 0, 25, and 50 ppm of trace elements, and spraying time, unsprayed, sprayed once every 3 days, and sprayed once every 6 days, respectively. Observed variable includes plant height, number of leaves, fresh and dry weight of root and stem. The observation was conducted every 4 days, started from 1 week after planting up to harvest. Observation of fresh and dry weight of root and stem was conducted upon harvesting. The result indicated that application of organic material have significant influence on plant height, number of leaves, fresh and dry weight of root and stem. Concentration of trace elements showed significant influence on plant height, number of leaves, and stem fresh weight, but didnt influence on stem dry weight and fresh and dry weight of root. Spraying time of trace elements had significant influence on number of leaves, fresh and dry weight of stem and root fresh weight, but didnt show significant influence on plant height and root dry weight. The content of stevia sugar using treatment applications with organic material and trace elements was higher compared to control. Tujuan penelitian adalah untuk mengetahui pengaruh pemberian bahan organik dan unsur trace elements terhadap pertumbuhan dan kandungan gula stevia pada tanaman Stevia rebaudiana Bertoni M. Penelitian ini menggunakan Rancangan Acak Lengkap yang terdiri dari 20 perlakuan dengan 3 ulangan. Perlakuan yang digunakan adalah kombinasi bahan organik dengan dosis 0 kg, 0,5 kg, 1 kg, dan 1,5 kg, trace elements (dosis 0 ppm, 25 ppm, dan 50 ppm), dan waktu penyemprotan (tanpa disemprot, disemprot 3 hari sekali, dan disemprot 6 hari sekali). Peubah yang diamati meliputi tinggi tanaman, jumlah daun, bobot basah dan kering akar, serta bobot basah dan kering tajuk. Pengamatan dilakukan 4 hari sekali dimulai sejak tanaman berumur 1 minggu setelah tanam sampai panen. Pengamatan bobot kering tajuk dan akar dilakukan satu kali pada saat pemanenan. Hasil penelitian menunjukkan bahwa pemberian kompos berpengaruh nyata pada tinggi tanaman, jumlah daun, bobot basah tajuk, bobot kering tajuk, bobot basah akar, dan bobot kering akar. Konsentrasi trace elements berpengaruh nyata pada tinggi tanaman, jumlah daun, dan bobot basah tajuk. Sedangkan pada bobot kering tajuk dan bobot basah dan kering akar tidak berpengaruh nyata. Waktu penyemprotan trace elements berpengaruh nyata pada jumlah daun, bobot basah dan kering tajuk, dan bobot basah akar. Untuk tinggi tanaman dan bobot kering akar tidak berpengaruh nyata. Kandungan gula stevia pada tanaman stevia dengan perlakuan kombinasi bahan organik dan trace elements lebih tinggi daripada kontrol.
PELATIHAN PEMBUATAN REAGEN KIMIA UNTUK PRAKTIKUM IPA SMP DAN IMPLEMENTASINYA DALAM KEGIATAN PEMBELAJARAN BAGI GURU IPA, LABORAN DAN SISWA SMP Eny Hartadiyati; Maria Ulfah; Praptining Rahayu; Lussana Rossita Dewi
E-Dimas: Jurnal Pengabdian kepada Masyarakat Vol 2, No 1 (2011): E-DIMAS
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/e-dimas.v2i1.93

Abstract

Abstract Based on the survey, SMP Negeri 4 Semarang had many parrarel classes that it had?é?á 3 hours/week for science subject. To support it, this school was equipped by having a natural sciences labolatory. Actually, the teaching and learning process at the labolatory has been done well, but it needed to develop. Thus, they still need to buy?é?á reagent?é?á in chemistry store or health labolatory to help teaching natural sciences on practical work. Therefore, that chemistry reagent was not in new condition. Chemistry reagent which was kept too long in a storage place would decrease its ?é?áquality, then it will reduce the validation result if it is used for experiment on practical work.?é?á This case was caused by the teachers whose lack of skills in using the practical tools and understanding the function of these tools and materials. Then, we need a management in how to use practical work especially chemistry materials and reagent. The target of this program was natural sciences teachers, labolatory assistants and students of SMP Negeri 4 Semarang. The output result for this program was chemistry reagent and a set of equipment. This training makes the teachers and labolatory assistants more competent in providing chemistry reagent for natural sciences practical work autonomously. Key words: chemistry reagent, natural sciences teachers, labolatory assistants.