As far as i know no economical methods are available for de-salinization of ground water for irrigation. Also, RO is not economic way to supply fresh irrigation water, moreover discharge rates are low for irrigation water volume demands. Also, RO water is too precious for irrigation, i mean it should be utilized any other sector(s).

So, in my opinion, it is better to utilize methodologies such as Leaching, drip irrigation, proper fertigation programs to reduce salt damage.

If anyone have an other suggestion or idea, i will be glad to know..

Regards

Yes my dear Meric. You are right. There are so many practices for utilizing saline water in irrigation. As you told and also Dilution of it through canal water, mixing, blending and alternate use of these water with canal water and many more.

i want to know that if any cheaper method is available to reduce salts in saline water before irrigation quickly and fast. If any one have any idea and suggestion that will be appreciated.

regards

I wonder which is the origin of that saline water.  

Thanks

If you make  frequent irrigation by lesser water amounts, the salinity hazard will be decreased. 

Dear Garcia,

The most obvious salt source of saline groundwater in fields close to sea is seawater intrusion. You can use keyword "seawater intrusion" for your research needs. Of course  fertilizers also add salt into soil during crop production but this is another case.

Regards..

Dear Sahin,

This is completely true. As you know well, salts are moved to edge of wetted pattern (edge of sphere) where plant roots are not dense in the soil due to water movement, in case of drip irrigation. 

Regards

Dear Meric,

If I ask about the origin of saline water is because I didn't know it.

There are different sources of salt for underground waters.

Thank you for the friendliness of your answer.

Have a nice day

Dear Dr Meric and Dr Garcia: Thanks for your comments. Where I am working it is inland salinity. In India most of the aquifers are saline to highly saline in arid parts of country. most of the time there are no other alternative water is available practically even for drinking purposes. Many a time surface soils of these aquifers are also highly saline which aggravate the problem. Regards

Dear Sahin: Yes one can reduce salinity hazards by frequent application in less amount of water. It is true till the field is moist as soon as the field will dried up one can think of situation and concentration of soil solution in rhizosphere.

Still I am looking for an answer which could help me. 

Dear Sarwan Kumar Dubey:

As i know as well as all others researchers, to reduce the impact of high concentrated undergrounds water used for crops irrigation, we have one simple method: keeping an optimal humidity level in our irrigated soil and try to maintain it can reduce the negative effects of water salts

Regards

Thanks Dr Ahmed: Thats true but in arid conditions maintaining humidity in field a dificult task. Thanks 

Dear Dubey:

The south of my country is so dry and there are specialist in irrigation systems with saline water.

Please contact Dr. Antonio Pulido from University of Almeria, maybe he would help you whit your case (https://www.researchgate.net/profile/Antonio_Pulido).

All the best for you and your community.

I know only ne method - dilution of ground water with fresh river water. Such methods is used in Central Asia.

Yes Dr Starodubtsev: dilution method is quite common in our country too. But it have practical difficulty as we have to make a pond to mix it for dilution than use for irrigation.  I have worked on different level of dilutions with rice - wheat crop rotation. We also tried alternate and/ or growth stage dependent irrigation with saline and good quality canal water. Such as a very heavy presowing irrigation with saline water. First irrigation a little earlier at crown root initiation. By that time plants become hardy than one can go for next irrigation of saline water and again at the time of flowering/milk/seed formation good quality water. It works quite well. 

OK Thanks Dr Ali Rasaei. Does it really works and possible for irrigation purposes. It seems to be good alternative. Please send if some literature and/or methodology available.

Dr Dubey

You are already an accomplished scientist and aware about the cheap methods for the Indian sub continent. Since you have asked, in-spite of so many of your publications which are related with the query, I have following suggestions

Rain water harvesting is the cheapest source to improve ground water quality. It could be ponds, recharge pits, recharge wells, percolation trenches, afforestation, etc. as per the site specific demand and availability of rain water. Comprehensive Watershed Management is the only cheapest solution under Indian Agro climatic conditions. 

Most parts of India receives fairly good rainfall, but, most of the rain water mixes with drainage effluent and goes waste. Storm water drainage system is not in planning even in the developed states of India. With increasing population, city limits have encroached upon the farm and forest land, leaving little opportunity time for infiltration of rain water into ground water resource. Land and builder mafia in connivance with politicians have dumped city wastes into ponds and water bodies, that once recharged ground water. Poor rain water management is the cause of floods in Kashmir, Uttarakhand and Mumbai, choked drainage system along with deforestation are causing instant floods initially and water shortages or availability of poor quality water in later months.

Recycling, Reuse, Water conservation, Drip Irrigation, Mulching, Blending, Alternately irrigation with saline water, Salinity resistant varieties, Use of organic waste as mulch could be other possibilities of improving irrigation efficiency. 

Thanks Dr Shrivastava ji,

As suggested by you I have tried all methods for eliminating or reducing harmful effect of saline water. I posted this questions to get some ideas which I and my team mates might have not knowing. Thanks for concern. regards Dubey

You can also add partially burned rice husk or straw into the soil to reduce the salinity effects.

Thanks Dr Mohamed Aheeyar: We tried but here I was interested in reducing salinity of irrigation waters. Thanks

Dear Rasaei,

I saw some equipment installed around the outer surface of the irrigation PE pipe, to magnetize the water.. Unfortunately I have no idea about the theory or usability of the method... Some say magnetizing water is only temporary.

If you can share the details, i will be glad...

Hi Dr MK Meric; I did not worked on water magnetization perhaps the following link may be useful for you. Though they do not talked much about the effect of Magnetization on salt concentration. However they recommend it for less water uses.

http://www.sciencedirect.com/science/article/pii/S0378377409000900

http://onlinelibrary.wiley.com/doi/10.1111/j.1600-051X.1993.tb00366.x/abstract

http://ascelibrary.org/doi/abs/10.1061/(ASCE)IR.1943-4774.0000304

regards

I am using Nanofiltration to partially desalinate brackish water and leave the micro-elements that are required by the plant. The research is going on for the last 3 years with excellent results.

Hi Prof. Rami Marcel Messalem, It is new for me. I will apreciate if you educate me on your research. Thanks.

It is my great pleasure to widen the use of partial Desalination for agricultural purposes.

Please look up the articles that we published, Dr. Andrea Ghermandi and myself.

Let me know if you need further information.

Dear Rami Marcel, Thanks for your kind suggestion. I appreciate it. Regards.

I agree with Meric, M.K.

We investigated the influence of magnetic field on chemical clogging of emitters under different saline water applications. When higher saline water was magnetized, it was found that discharge rates under non-magnetized water were lower than those of magnetized water. More results can be found in below study.

Sahin, U., Tunc, T., Eroğlu, S., 2012. Evaluation of CaCO3  clogging in emitters with magnetized saline waters. Desalination and Water Treatment, 40: 168–173.

My Dear @U. Sahin ; Thanks for your comment and paper. It will be of great use for me. Regards

Straw mulch could be a cheap material for salt control in the soil surface by reducing soil evaporation 

Thanks Dear Qingtao for your response. I appreciate it. Regards

The water balances are used to estimate the deep drainage under a number of contrasting climates.

• The rates of deep drainage were then applied to salt budgets to estimate the likely soil salinity following irrigation with wastewater of varying salinities.

http://archive.nwc.gov.au/__data/assets/pdf_file/0004/19903/Brackish-water.pdf

SIR, NEW INSTRUMENTS/DEVICES HAS BEEN INVENTED BUT NOT YET TESTED FOR THEIR AUTHENTICITY. THESE DEVICES ARE EITHER BASED ON THE PRINCIPLES OF MAGNETISM OR ON FLUID DYNAMICS. I THINK WE MUST INCLUDE OUR IITans  TO INVENT SUCH INDIGENOUS DEVICES.  YOU PLEASE CONTACT SUCH PROFESSIONALS/INSTITUTES  PERSONALLY AND SURELY THEY WILL INVENT SOMETHING NEW. 

I believe it is really difficult to reduce salinity in water, the only way to get irrigation water is to recycle water, dilute with groundwater or rain water. 

Boiling off water requires so much power, RO is costly for irrigation alone.

Well,

When we talk about cheap method to reduce salt concentration in ground waters being used for the irrigating crops, Mixing application with another source of fresh water is the cheapest.

Sincerely

The best method is recyclization with fresh river or low salinity well water

If you have a greenhouse or roofed structure collect rainwater which generally have little issues with salinity. As far of reducing salts it I believe that a straw filter would be useful as well as straw mature compost filter. Humic materials are well associated with reversing salinity effects. You may want to collect rain water dilute with well water and pass through straw compost filter.

not possible in practical scale.

Rather than mixing saline with fresh water, it much better to use turn wise (alternate) irrigation method. One irrigation with saline water and if available the 2nd with fresh water.