En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Rhizobium inoculant for Leucaena and othr leguminous tree seedlings

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
    
 
See a list of all Smarty Plants questions
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.

Need help with plant identification, visit the plant identification page.
 
rate this answer
Not Yet Rated

Tuesday - January 02, 2007

From: Leander, TX
Region: Southwest
Topic: Propagation
Title: Rhizobium inoculant for Leucaena and othr leguminous tree seedlings
Answered by: Nan Hampton and Joe Marcus

QUESTION:

What sort of Rhizobium inoculant would be appropriate for Leucaena and other leguminous tree seedlings?

ANSWER:

It is correct that legumes such as White Leadtree (Leucaena leucocephala) and, as another example, bluebonnets, require Rhizobium bacteria to enable them to fix atmospheric nitrogen for use by the plant. Furthermore, there are different strains of Rhizobium and the strains that are effective for bluebonnets are not necessarily effective for Leucaena. The Rhizobium strains are species specific. It is possible that the proper strain of Rhizobium is present in your soil already. You can check this by looking at the roots of your Leucaena. If there are nodules present, then it already has the correct Rhizobium species. If you have access to mature Leucaena plants, you can simply harvest some soil from around the roots of them and inoculate your seedlings' soil with some of it. It would only take a very small amount per pot. You could mix a handful or two of native soil into a pile of potting soil and that should do the trick—nothing fancy; the roots and the Rhizobium will find one another.

Research in Australia has cited two strains of Rhizobium that are effective with Luecaena. In acid soils Strain CB3060 (TAL1145) was most effective in N2 fixation. This is cited in Tolerance of Leucaena to Acid Soil Conditions by F.P.C.Blarney and E. M. Hutton, p.84. In the article "Establishment and Early Growth of Leucaena" C. M. Piggin et al., p. 87, report strain CB81 was found reliable and strain NGR8 less reliable. They also report (p. 88) CB3060 (TAL1145) is good in acidic soils as well as more neutral soils.

Unfortunately, there are few sources for obtaining Rhizobium cultures. I did find one source, Becker Underwood in Australia with worldwide production and marketing, for purchase of CB3060. The USDA has a Rhizobium Germplasm Collection that provides free cultures for research but they do not have a database of strains available. You can see a list of other bacterial culture collections worldwide.

For a good discussion of seed treatment and nitrogen fixation see Agroforestry for the Pacific Technologies from the U. S. Forest Service and also Nitrogen Fixing Tree Start-up Guide from Agroforestry.com.

You can also check with the Williamson County Extension Office of the Texas Agricultural Extension Service and see if they know of the availability of Rhizobium strains.

 

More Propagation Questions

Planting Texas Mountain Laurel seeds in Horse Shoe Bay,TX
July 09, 2012 - I have harvested Texas Mountain Laurel pods and extracted the seeds from the pods. The seeds are characteristic red/orange/maroon. When is the best time and best method to introduce seeds into pots? ...
view the full question and answer

Weak flowering on rosa minutifolia from San Diego CA
July 27, 2013 - Hi, I have a Rosa minutifolia and has been doing great, but when it gives flowers the petals fall too fast, only last a day or two and also the fruit never forms completely and finishes drying so I ca...
view the full question and answer

Illinois native grasses for shade
June 27, 2013 - Hello, my grass has died in a very shady area (standard buffalo grass), and I took this as an opportunity to plant some native grass varieties. I originally thought of buffalo grass, but learned that ...
view the full question and answer

Propagation of Mountain Laurel by seed
March 28, 2007 - I harvested the seed or nut from our Mountain Laurel this spring and I would like to propagate them in containers for at least a year and then transfer them to the ground. I live in Hays County, TX in...
view the full question and answer

Growing grapes from seed in California
April 22, 2008 - Can I grow grapes from seed? If so, what is procedure?
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center