Pertumbuhan dan perkembangan bakteri
Thus an additional nitrogen can increase soil fertility. Rash roots release organic nitrogen compounds into the soil where plant life pod. If the bacteria are separated from their host (root), then the nitrogen can not bind at all or only very little to bind nitrogen. The roots of leguminous plants that provide carbohydrates and other compounds to the bacteria through its ability to bind nitrogen to the roots. Rhizobium symbiosis with plants that are widely used as green manure such as Crotalaria, Tephrosia, and Indigofera. Bacteria that live symbiotic nitrogen plant legumes namely Rhizobium leguminosarum, which live in root nodules or nodule-forming nodules. Nitrogen free-living bacteria is Azotobacter chroococcum, Clostridium pasteurianum, and Rhodospirillum rubrum. This group of bacteria that live there freely and symbiosis. Because of its ability to bind nitrogen in the air, these bacteria affect the economic value of agricultural land.
PERTUMBUHAN DAN PERKEMBANGAN BAKTERI FREE
Nitrogen bacteria are bacteria that can bind free nitrogen from the air and turn it into a compound that can be absorbed by plants. Dengan demikian terjadi penambahan nitrogen yang dapat menambah kesuburan tanah. Bintil-bintil akar melepaskan senyawa nitrogen organik ke dalam tanah tempat tanaman polong hidup. Jika bakteri dipisahkan dari inangnya (akar), maka tidak dapat mengikat nitrogen sama sekali atau hanya dapat mengikat nitrogen sedikit sekali. Akar tanaman polong-polongan tersebut menyediakan karbohidrat dan senyawa lain bagi bakteri melalui kemampuannya mengikat nitrogen bagi akar.
Tumbuhan yang bersimbiosis dengan Rhizobium banyak digunakan sebagai pupuk hijau seperti Crotalaria, Tephrosia, dan Indigofera. Bakteri nitrogen yang hidup bersimbiosis dengan tanaman polong-polongan yaitu Rhizobium leguminosarum, yang hidup dalam akar membentuk nodul atau bintil-bintil akar. Bakteri nitrogen yang hidup bebas yaitu Azotobacter chroococcum, Clostridium pasteurianum, dan Rhodospirillum rubrum.
Kelompok bakteri ini ada yang hidup bebas maupun simbiosis. Karena kemampuannya mengikat nitrogen di udara, bakteri-bakteri tersebut berpengaruh terhadap nilai ekonomi tanah pertanian. However, the application of all kind of extiact did not suppress the incident of bacterial wilt of banana plant.Bakteri nitrogen adalah bakteri yang mampu mengikat nitrogen bebas dari udara dan mengubahnya menjadi suatu senyawa yang dapat diserap oleh tumbuhan. Fruit extract had the highest ability in suppressing the growth of bacterial wilt. The results showed that extract of fruit, leaf and root of pace suppressed the growth of R.
In vitro study was conducted by using completely randomized design, while intact plant study was conducted by using completely randomized block design. The treatments for both in vitro and intact plants were (1) steril water (control), (2) extract of pace fruit, (3) extract of pace fruit leaves, (4) extract of pace roots and (5) bactericide (agrymycin sulfate). The study consisted of in vitro and intact plant experiments. A study on the effect of extract of pace plant against bacterial wilt of banana were carried out in laboratory and experimental farm of Plant Protection Department, College of Agriculture, University of Lampung from May until October 2003. Bacterial wilt of banana (Ralstonia solanacearum) is one of banana diseases that potentially destructs banana plants in some areas. Inhibitory effect of pace extraction on growth of pathogen and development of bacterial wilt of banana disease.