Kemampuan beberapa isolat Azotobacter Sp. dalam memperbaiki perakaran jagung (varletas pioneer) secara in-vitro pada beberapa level pemupukan N anorganik

Abstract

This research was conducted to determine the potential of bacterial isolates, isolates local Azotobacter in chain N, produces photohormon auksin, cytokines and giberelin, dissolved phosphate and know it impacton on the growth of corn roots it in-votro. This research begins with a test against the bacteria Azotobacter sp. Based its ability to produce hy[er growth substance indol acetic acid (AlA), its ability to produce hormones and cytokines giberelin and the ability to produce phosphates enzymes to then be selected as test isolates selected on rooting in in-vitro. Root Test using Random Design Group with three selected isolates (1 CM (Cimanggu), 7 NTB (West Nusa Tenggara), CK 19 (Cikabayan)) a control, five treatment nutrient N 100%, 75%, 50%, 25%, and 0% and three replicants, so there are 60 units which were grown in experimental medium Watanabe. Research results showed that isolatethe best in improving the root is 1 CM. Giving inokulan 1 CM can efficiently N-nutrient needs for 18.73% of the nutrient treatment 100% N, whereas 7 NTB for 5.78%, and CK 19 for 2.89%. The ability of Azotobacter nitrogen hitch, produces phosphate phytohormon and dissolve it shows the potential rhizobacter a real impact in improving the growth of maize roots.