Pengaruh Pemberian Bakteri Asam Laktat, Bakteri Fotosintetik Anoksigenik dan Bakteri Pelarut Fosfat terhadap Pertumbuhan Tanaman Sawi (Brassica Chinensis L Var. Tosakan)

Abstract

Research on "The effect of lactic acid bacteria, anoksigenik photosynthetic bacteria and bacterial phosphate solvent on the growth of mustard (Brassica chinensis L. var. Tosakan)" has been done in the Laboratory of Microbiology, Department of Biology, Faculty of Mathematics and Natural Sciences, Laboratory of Basic Science and Laboratory for Research and Technology Faculty of Agriculture, University of North Sumatra from November 2009 to October 2010. This study aims to look at and know the effect of Bacteria lactic acid bacteria, anoksigenik photosynthetic bacteria and bacterial phosphate solvent which poured into the soil on the growth of mustard (Brassica chinensis L). Lactic acid bacteria is Lactobacillus sp. isolated from mustard that canker then grown on special media MRS agar. The treatments included control (P0), Lactobacillus sp. + anoksigenik photosynthetic bacteria + bacterial phosphate solvent (P1), Lactobacillus sp. (P2), anoksigenik photosynthetic bacteria (P3), bacterial phosphate solvent (P4) and Agrobost (P5), then each tested on cabbage (Brassica chinensis L). Parameters were measured slope of C/N ratio and phosphate available in the soil, vegetative measurement of plant height, leaf length and leaf number and plant dry weight measurements. The result is variated of each observation. To the measurement levels of C/N ratio and phosphate are available indicate that the treatment P3 increase the ratio of C/N ratio in the soil while the P2 and P4 helps the absorption of phosphate in the soil compared to other treatments. On the measurement of vegetative plants, for plant heightn number of leaves, P4 gave a great influence and for leaf length indicated by P3. On plant dry weight measurements that give a great influence is P3.