I got here late, but question. at 17:17 when youre talking about you might not be sure why Chris 4-6 OM accumulation is rising, could it be due to root exudation? This could actually be helping Chris, many people struggle with low CEC on sand based greens, and as he is applying less fertiliser maybe microbial population is working harder in this range? Very interesting and IMO a very good thing! I have 2% OM in that range and i struggle with low CEC. I have to apply alot more Ca/ P/ Mg than one would think.
It's normal for healthy grass growing in soils with low organic matter content to have an increase in soil organic matter. I may not have been clear about that, but that is what I expect is happening at the 4--6 cm depth. This may be from root exudates, and from whatever other processes lead to increasing organic matter in soil.
I got here late, but question. at 17:17 when youre talking about you might not be sure why Chris 4-6 OM accumulation is rising, could it be due to root exudation? This could actually be helping Chris, many people struggle with low CEC on sand based greens, and as he is applying less fertiliser maybe microbial population is working harder in this range? Very interesting and IMO a very good thing! I have 2% OM in that range and i struggle with low CEC. I have to apply alot more Ca/ P/ Mg than one would think.
It's normal for healthy grass growing in soils with low organic matter content to have an increase in soil organic matter. I may not have been clear about that, but that is what I expect is happening at the 4--6 cm depth. This may be from root exudates, and from whatever other processes lead to increasing organic matter in soil.