I am back and settled in NJ from the SoCal trip. The weather there was great and it seems that the weather here is improving. (I was able to wash my car today!) I hope those I saw in LA area were helped and all the samples I collected should be back from the lab by the middle of this week. My next trip is to Las Vegas on Sunday night the 15th. I will be there and the surrounding areas until a red-eye flight on Friday the 20th. When I get back it will be nothing but report writing for a few weeks.
Another snowy Sunday heading into freezing rain Monday! I just got back and settled from the GIS in San Antonio last week and will be heading to Los Angeles tomorrow evening- assuming my flight doesn’t get cancelled! Anyhow, it was great to see guys and meet new people in Texas and get home safely. Those shows are long and rough nights. I am sorry if I missed some of you I had on my list to see. It was a quick trip and everybody is going in different directions. Back to work Tuesday and hopefully nice weather in SoCal….
For those of you old enough to remember this time, the link below will bring back some good memories. Most people know of this game. I was just there on a family vacation a couple of weeks ago and got to walk the arena. Lake Placid, NY is a small town and after being there, it is hard to believe they ever held an Olympics!!
Just read this historical article on Bermudagrass hybridization
I wanted to share some information that will help those of you with higher sodium and bicarbonate irrigation waters determine how bad “bad” is. See the article below…..
New Calculation for SAR on Irrigation Water Reports
The traditional sodium adsorption ratio (SAR) for irrigation waters is best used for waters that are low in bicarbonate andcarbonate at concentrations < 120 ppm and < 15 ppm, respectively. In the SAR equation, bicarbonate and carbonate concentrations are not included; therefore, it does not account for the effects of these ions. When bicarbonate and carbonate ions are present in moderate to high levels, these can react with calcium and magnesium to form lime by precipitation in the soil or sometimes in the irrigation lines. Thereby, soluble calcium and magnesium forms are depleted that are essential to displace sodium from the CEC sites on clay surfaces where the sodium causes breakdown of aggregates and dispersal of clay particles. To account for bicarbonate and carbonate ions in the irrigation water an adjusted SAR was developed (Ayers and Westcot, 1976). The formula is: adj SAR = SAR [9.4 – pHc], where the pHc value is a theoretical, calculated pH value based on the irrigation water chemistry, which integrates the influence of calcium, sodium,magnesium, bicarbonate, and carbonate concentrations. Both SAR and adj SAR are currently on our irrigation water reports. However, recent research has shown that adj SAR tends to overestimate sodium permeability hazard because it did not adequately account for changes in calcium after irrigation water addition due to the potential for dissolution or precipitation of calcium. The preferred adjustment for SAR is termed adj RNa and uses a substitute Cax value in the SAR equation in place of calcium concentration. The Cax factor comes from a table of bicarbonate/calcium versus electrical conductivity. Use of adj RNa is best for irrigation waters that are high in bicarbonate and carbonate, such as when concentrations are > 120 ppm and > 15 ppm, respectively. Given this information Brookside Labs, Inc. has decided to add adj RNa to our irrigation water reports. In published literature where SAR and adj SAR have been used in interpretation tables and figures, adj RNa can be substituted for these values. So the interpretation does not change, but the way that the permeability hazard is calculated does.
Using SAR and adj RNa. SAR is best used when bicarbonate and carbonate levels are low (< 120 ppm bicarbonate and/or < 15 ppm carbonate) and adj RNa is best used by when levels are high (> 120 ppm bicarbonate and/or > 15 ppm carbonate). So unless the irrigation water is very “clean” the new adj RNa calculation will be the one to use going forward
I am just getting started back to work today. I was on a family vacation in Lake Placid, NY. Very pretty part of the country and we got to walk the Hockey rink where the US beat the Russians in 1980! That was a great experience and something to see. A pretty rough cold virus is going through the family now and we are all trying to recover. I am looking forward to some good weather in San Antonio at the GIS.
I am at the airport in Newark waiting to fly to Dayton, Ohio. I will be having a meeting at the lab in New Bremen tomorrow. I like to get to the lab every two years to see what is new in person and refresh my memory on how things are done.