Mowing and Rolling vs Clipvol

In my previous two posts I shared how changes to our mowing and rolling frequency resulted in better playing condition for half the price. This post will show how our growth rate contribute to that success and maybe will suggest one of the reasons I'm so obsessed with clipvol. It's the holy grail of turfgrass management.

I initially measured clipvol to optimize our mowing frequency. I didn't want to cut greens if there wasn't any growth and I also didn't want to cut the greens and get too much grass. Over the years I have found that the ideal clipvol is about 20ml/m^2 per day. This is the figure I use in my Growth Ratio and is the target clipvol I aim for when I send out my mower. I can keep green speeds within our target easily with a clipvol within this range as can be seen in my previous post.

What this means is that I want to get the exact same clipvol with every mowing. As I adjust the growth rates, the frequency of mowing will adjust to get this target clipvol.

The table below shows that average clipvol per mowing per month and per year.

For the past 3 years I have been able to hit our target clipvol targets almost perfectly. We cut slightly too much grass in the summer and slightly not enough in the winter. We could reduce our clipping yields per mow in the summer by cutting more frequently, but this costs us more and isn't needed to meet our green speed goals.

Ultimately, all of these efficiency gains, cost savings, and playability enhancements aren't possible if we don't have control of the growth. If we grow the grass too fast we will have to mow more frequently. If we grow it too slow we will likely have to spend more on fungicide. If we can get the growth just right, over and over, we can get good conditions for the lowest cost over and over...that's the theory anyway.

Less time spent getting the conditions we want leaves more time for stuff like collar damn removal

Turfgrass speedo is still my most important tool for managing turf growth after 4 years.

It wasn't the easiest year for growing grass , but the conditions were still pretty good. Almost 4 years ago exactly, I came up with the idea of comparing actual clipping yields to the "ideal" clipping yield or the clipping yield adjusted using the Growth Potential Model . Since then, it has proved to be a much more useful tool to manage growth than I originally thought . It has been almost a decade since I started making observations on plant health and playability and how it relates to the clipping yield. I have been constantly searching for ways to get the growth rate right as often as I can and this tool seems to be the best way I have seen so far, and might ultimately, be the best way going forward. To prove this point I will discuss in a future post, the success I've had with pest control in the past few years (for the most part (Not withstanding the times where I think my greens are dead but they actually aren't...thanks T)). Never needed less There are ...

Do you have enough?

I recently discussed how we can use fertilizer ratios to simplify how much fertilizer we apply to help us keep above the MLSN guidelines . When we get a soil test done it is a static amount of nutrients found in the soil. Even if you are above the MLSN guidelines at the time of testing, it doesn't guarantee that you will remain at or above the guidelines as the grass grows and consumes nutrients. There is math that you can use to determine exactly how much nutrient you need to apply to ensure that you remain at or above the MLSN guidelines. For many, this is much too complicated. For that reason I made a quick cheat sheet to help you determine how much of each nutrient you can expect to use each year based off a few different annual nitrogen rates. Nutrient use is based primarily on nitrogen use so the left 2 columns are a few different nitrogen rates. The columns for each nutrient are in PPM and are designed to help you look at your current soil test PPM (mehlich 3) and determin...

How to quantify nutrient content in liquid fertilizer

In a recent post, I discussed how it was actually cheaper to spray soluble vs granular fertilizer. What about if we use pre-mixed liquid fertilizer? How do we even figure out how much nutrient we are applying with pre-mixed liquid fertilizer? Before I learned that you could simply dissolve soluble fertilizer in water and apply it in a sprayer, I was a big user of pre-mixed liquid fertilizers. One of the issues I initially had was figuring out exactly how much of each nutrient I was applying. The math wasn't as straightforward is it was with granular fertilizers. It turns out, it's actually not that difficult but requires an extra step. First, we need to convert the liquid volume into a mass. Many products will have the product density displayed on the label or you can look in the Safety Data Sheet (SDS) for that information as well. No SDS? Should you be using products without an SDS? Even if this information isn't included on the label it is very easy to figure out. All ...

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