Soil samples should be taken and analyzed. We need to know the Electrical Conductivity (EC), Sodium Adsorption Ratio (SAR), Cationic Exchange Capacity (CEC) and the Exchangeable Sodium Percentage (ESP).
The target values are EC<4.0 mS/cm, SAR < 12, and ESP < 15%
CEC is a measure of the soils ability to exchange cations, sandy soils have a low CEC, clayey soils have a high CEC.
The formula for calculating L-GYP requirements is as follows:
(Actual % ESP - 12% ) x CEC =(Charge Requirement)(1.7tons/acre-ft)
Site is 1/3 acre, Damage is 2 feet deep, ESP is 46, CEC is 20
(46% - 12% ) x 20 =
This equates to 6.8 which we then multiply by 1.7 tons/acre-foot, leaving us with 11.56 tons gypsum/acre-ft.
1/3 acre x 2 ft deep = .666 acre-ft x 11.56 tons = 7.69 tons gypsum
50 gal L-GYP x 7.69 tons gypsum requirement = 384.5 gal L-GYP
This site would require 384.5 gallon L-GYP to remediate 1/3 acre2 feet deep. After the site has been properly prepared the L-GYP should be mixed 10 to 1 with fresh water and applied to site and watered in with 3 inches of water minimum, 6 inches preferred.
Procedure to remediate this site is as follows;
- Rip site to a depth of 2 ft
- Mix in 7 tons of hay (10 tons/acre ft minimum)
- Mix 385 gal L-GYP in 3850 gallons fresh water
- Apply mixture to site
- Water in with 54,000 gallons fresh water minimum
- 110,000 gallons water is preferred
- Sample site in 60 days and seed with desired crop
1 inch of water is 27,000 gal per acre. So 3 inches of water is
27,000 x 3 = 81,000 gal x .666 = 53,946 gal water.
It takes 3 inches of water to drive L-GYP 1 foot deep since damage is 2 foot deep, we recommend 6 inches of water or 110,000 gal. It is alright if water pools on site as long as it doesn't run off. Some sites can be bermed to prevent runoff.
If downward leaching of salt is a concern, many times we have added french drains to a sump so leachate can be recovered and disposed. If you have any questions please call, we have been selling L-GYP for over 2 years with great success.
Get our Material Safety Data Sheet for L-GYP