In the presentation, I talked about the management, selection, and optimization of mower adjustment, grass variety, soil moisture, soil organic matter, and nitrogen application rate as being the five things, all interrelated, that when moved closer to optimum management will be sure to produce improved turfgrass. Watch the video here (20 minutes).
The Global Soil Survey is a citizen science project in which turfgrass managers from around the world can submit samples from their location. These samples will be added to those of other survey participants to generate new and improved nutritional guidelines for turf.
The mission and goals of this project are:
production of new, sustainable soil nutritional guidelines that target the lowest nutrient levels needed to support the desired levels of turf quality and playability
generating the new guidelines through analysis of soil samples collected by survey participants from around the globe
providing participants with individualized reports on soil nutritional conditions at their location, as well as quantification of their sustainability index
promoting adoption of the new sustainability guidelines through social media, websites, articles, scientific presentations and educational seminars
insuring reliable data by utilizing a single, highly reputable laboratory for all analyses
Sampling and shipping instructions for collection of 3 soil samples
Sample bags, sample submission form, box for sample shipment to Brookside Laboratories (All shipping costs will be pre–paid for U.S. participants)
An individualized report, emailed to each participant, that assesses the soil nutritional status at their location, quantifies the sustainability index, and provides guidance on nutritional practices that will help to reduce inputs without sacrificing turf quality or playability. Twenty–one different parameters will be analyzed including pH, S, Ca, Mg, K, Na, P (Mehlich 3, Bray and Olsen), PSI, nitrate–N, ammonium–N, total N, EC, B, Fe, Mn, Cu, Zn, Al and Cl.
Each participant's data will be pooled with that of other survey participants to generate new and improved soil nutritional guidelines for turf. These guidelines will be made available to the public on websites and in articles, presentations and educational seminars.
This is a good one. A friend sent me these photos and asked if I could identify what had caused the yellowing seen in the photo above, and in a closer view below. I couldn't solve it at first, but once it was explained to me, the symptoms made perfect sense.
Here is a bit of contextual information that may help in solving the mystery. These symptoms appeared on a korai (Zoysia matrella) putting green maintained at a mowing height of about 3 mm in Japan in early August. Can you identify what has happened here?
This one proved difficult to solve, with answers coming in speculating that it was caused by: surfactant or herbicide spilling from a leaky bucket; scalping caused by too much fertilizer or sand or grain or aerification; crop circle caused by mythical rabbits; disease; fireworks; bug spray; and more.
The correct answer is that this korai green had a few small patches of Miniverde utlradwarf bermudagrass in it. The greenkeeping staff removed the Miniverde by plugs, replacing with korai, but somehow did not remove all the Miniverde. Because of the different growth habit between korai (very upright) and bermudagrass (more creeping and stoloniferous), when the greens were verticut, the korai remained green, while almost all the green leaf material of the Miniverde was cut off.
Dr. Brett Morris from Australia and Billy Aylmer from Ireland were the closest in identifying the cause of this mystery.
@asianturfgrass then they have put a plug of zoysia in centre of contamination to assist in coverage?
One of the implications of this differential response to verticutting is that korai greens grown in that climate may require substantially less frequent verticutting than ultradwarf bermudagrass. The Miniverde would not have looked like this had the greens been verticut more frequently.
I spoke about Minimum Nutrient Requirements for Putting Green Turf at the Philippine Turfgrass Forum 2013, and UPLB Research, Development, and Extension have graciously recorded a video of this presentation and made it available for viewing.
I will be speaking about Nutrient Requirements for Golf Courses in Asia and then giving another presentation on Selection of Grass. Both of these topics are ones I am excited to speak about and are ones that I have studied extensively over the past few years.
The program includes other presentations about turfgrass management, including one on the Latest Trends in Golf Course Maintenance by Andy Johnston, along with additional talks on a range of subjects related to course design, construction, and club management.
The short answer is no, as long as sufficient potassium (K) is present in the soil. In another interesting paper from the 2013 International Turfgrass Society Research Conference, Cisar et al. looked at Tifway bermudagrass performance when the soil contained high amounts of sodium (Na).
Figure 1. Tifway bermudagrass grown at the Asian Turfgrass Center's research facility in Thailand performed well despite soil sodium more than twice the amount of soil potassium.
In the experiment of Cisar et al., treatments of sodium chloride were made to establish high levels of soil Na. Over the course of this four-year study, where Na was applied, the soil Na levels were often more than 10x higher than the soil K levels. Where Na was applied, the average soil Na was 246 ppm; where Na was not applied, average soil Na was 47 ppm.
After a thorough examination of the results, Cisar et al. conclude that:
"The results of this intensive 4-year investigation do not suggest that additional K fertilization is beneficial for bermudagrass quality or clipping yield when elevated soil Na is present."
"Little to no increase in tissue K was observed for K application rates greater than 1.25 g/m2/month." (1.25 g/m2/month is equivalent to 0.25 lb/1000 ft2/month)
"Higher application rates of K fertilization generally did not result in an improvement of bermudagrass quality ratings."
One can use the MLSN guidelines to ensure soil K is kept at an adequate level. Adding more K beyond that level, as this research by Cisar et al. reports, does not seem to confer any benefit.
This week I spoke at the Philippine Turfgrass Forum, organized by Dr. Amihan Arquiza at the University of the Philippines Los Baños. The slides from my presentations, along with the accompanying handout, are available for download here:
The forum involved students, golf course superintendents, golf course architects, professors, landscape contractors, property developers, sod producers, and industry suppliers, with over 100 people in attendance. Dr. Arquiza began the afternoon with a wide-ranging talk on turfgrass in the Philippines and around the world, sharing her experiences and ideas of turfgrass use, as it is, and as it might be.
Tomas Valencia spoke about the production, use, planting, and export of manilagrass (Zoysia matrella), sharing his extensive knowledge of this grass and its wide range of uses as a turfgrass in Southeast Asia.
We then had an open forum, discussing turfgrass research and teaching in the Philippines, the bermudagrass white leaf pathogen, how one might apply nutrients to fine turf during the rainy season, the relative salt tolerance of manilagrass, and much more.