Soil

Does soil water content affect nighttime soil temperatures in summer?

I was wondering what the effect was. I expected a 1 or 2 °C decrease in nighttime soil temperature in drier soils, compared to soils with more water. I didn’t find it.

Roots, growth potential, and fertilizer

Bhupendra Singh posted a photo on Instagram with this caption: Growing roots! Tifdwarf at Peacock Course Greens, Delhi Golf Club I wondered how the grass had been managed for the past six months.

2 similar approaches to turfgrass nutrition, with 1 notable difference

At first appearance, the demand-driven fertilization of STERF seems almost the same as the growth potential (GP) and MLSN approach. If you are not familiar with this approach from STERF, you can download their Precision Fertilisation – from theory to practice, written by Tom Ericsson, Karin Blombäck and Agnar Kvalbein.

Is sodium an imaginary problem?

On sand putting greens, it is. The problem caused by sodium is a reduction in the downward movement of water in soils. This is caused by the deflocculation of clay in the soil.

Even at extremely high concentrations, the bicarbonate did not seal off the soil

When it comes to fearmongering in turfgrass, I’m not sure there is a bigger one than bicarbonate (HCO3-). One often hears of supposed problems associated with bicarbonate. I’m still waiting to see a soil or turfgrass problem associated with this ubiquitous anion.

Measuring surface hardness on greens, fairways, and approaches

I measured soil moisture and surface hardness on three fairways, approaches, and greens at a golf course in Thailand in September 2014. The fairways and approaches at this site are seashore paspalum on a sandcap.

Why is the grass so good, but the soil test results so bad?

I’ve been asked this question more times than I can remember. It usually goes something like this. We had the soil tested, and it turns out we are quite low in P (or K or Ca or Mg).

On the seductive attractions of metric units

Growing up and first working in the turfgrass industry in the United States, I naturally used US customary units: inches and feet, pounds and ounces, fluid ounces and gallons and so on.

Hitting all of our goals

This is an extraordinarily good video about grasses, mowing, construction, irrigation, soils, playability, maintenance cost, and more. If you are interested in these topics, watch this interview with Don Mahaffey.

More advantages of frequent irrigation

Update: I’m adding a note here today (21 Nov 2017) to correct and clarify about these data. Mike Richardson pointed out to me that the “differences from plots irrigated to field capacity 2X or 6X / wk were small and not significant” in this experiment.