Funny that this topic came up today. Earlier today in my Soil Science/Horticulture 332 class, "Turfgrass Nutrient and Water Mangement", our proffesor lectured on base cation saturation ratio (BCSR). Basically superintendents can get there soils tested and fert companies will create a fertility plan using the idea of ideal soil. The problem he said with this is that cation exchange capacities (CEC) are often off, becuase through the process of sumation cations are displaced by salts. Hope this is making some sense.
Basically what I got out of the lecture is that CEC levels are not super important when preparing a fertility plan, and that doing so may lead to loss of dollers due to over fertilizing and time. Hopefully that makes sense, and if I got that wrong my apoligizes.
To any of the supers, how often do you get soils tested and do you subscribe to any such programs?
Brendan
Brendon,
I got this from the March issue of the SSSAJ...You might want to question how up to date your professor is on his research. I see this as a prime example of fooh fooh money being thrown at a problem that may have even been created in a supers mind.
The use of "balanced" Ca, Mg, and K ratios, as prescribed by the basic cation saturation ratio (BCSR) concept, is still used by some private soil-testing laboratories for the interpretation of soil analytical data. This review examines the suitability of the BCSR concept as a method for the interpretation of soil analytical data. According to the BCSR concept, maximum plant growth will be achieved only when the soil's exchangeable Ca, Mg, and K concentrations are approximately 65% Ca, 10% Mg, and 5% K (termed the ideal soil). This "ideal soil" was originally proposed by Firman Bear and coworkers in New Jersey during the 1940s as a method of reducing luxury K uptake by alfalfa (Medicago sativa L.). At about the same time, William Albrecht, working in Missouri, concluded through his own investigations that plants require a soil with a high Ca saturation for optimal growth. While it now appears that several of Albrecht's experiments were fundamentally flawed, the BCSR ("balanced soil") concept has been widely promoted, suggesting that the prescribed cationic ratios provide optimum chemical, physical, and biological soil properties. Our examination of data from numerous studies (particularly those of Albrecht and Bear themselves) would suggest that, within the ranges commonly found in soils, the chemical, physical, and biological fertility of a soil is generally not influenced by the ratios of Ca, Mg, and K. The data do not support the claims of the BCSR, and continued promotion of the BCSR will result in the inefficient use of resources in agriculture and horticulture.
Abbreviations: BCSR, basic cation saturation ratio • CEC, cation exchange capacity