Dear Md. Abul Kalam Azad

Pls. find the attached files

https://www.researchgate.net/publication/268695910_Growth_and_metabolism_of_onion_seedlings_as_affected_by_the_application_of_humic_substances_mycorrhizal_inoculation_and_elevated_CO2

https://deepgreenpermaculture.com/diy-instructions/home-made-plant-rooting-hormone-willow-water/

http://www.scielo.cl/pdf/idesia/2016nahead/aop0816.pdf

http://www.tandfonline.com/doi/abs/10.1080/14620316.1994.11515247

http://www.nrcresearchpress.com/doi/abs/10.1139/m95-015#.V3zE1TZWGZU

http://www.humicsubstances.org/whatarehs.html

http://karnet.up.wroc.pl/~weber/kwasy2.htm

A. Piccolo. 1996. Humic Substances in Terrestrial Ecosystems. Elsevier,Pp. 675. ISBN0080534236, 9780080534237

M.K. van Ittersum, S.C. van de Geijn. 1997.Perspectives for Agronomy: Adopting Ecological Principles and Managing Resource Use. Developments in Crop Science Elsevier,Pp. 363. ISBN0080538665, 9780080538662

Regards

Prof. Houda Kawas

Article Growth and metabolism of onion seedlings as affected by the ...

Try NAA at low doses.Auxins at low doses initiates rooting  

Dear Md. Abul Kalam Azad,

I think the best solution is to apply the product when the plants are still in the nursery to reduce the cost. In this case you have to grow seedlings in jiffy pots in order to avoid transplantion stress and increase survival rates. Of course this applies better for experimental purposes, since as you describe the plants are mutants that you have created.  

For farm conditions you can apply the product through the irrigation water after tranplantation.

Best solution is to use mycorrhizal products of Glomus sp. for transplantation. The exact product name depends on the market.

Regards

Prof. Petropoulos Spyridon

You need to compromise between Auxin:Ck and the cheapest synthetic auxin is 2,4-D and rootX 

or you need to expose your seedling to 5-9oC for 1wk before transfering them to the filed... 

I think AM inoculum (Glomus sp) with PGPR (plant growth promoting rhizobacteria)/ entophytic bacteria ……  very cheap solution for the growers. We have a good result with onion and strawberry in pot trials.

Use of Cytozyme @ 0.2% as root dipping spray at 15 and 45 days after transplanting, dipping seedling roots for 20 minutes before transplanting and foliar sprays are found more effective in bulbs development and higher yield of kharif onion.

Use of MH to check premature bolting and sprouting in storage is recommended. MH @ 2000 ppm applied 75 DAP for kharif onion and @ 2500 ppm just before neck fall in rabi onion are recommended.

Try IBA at low concentrations.