Motion chart: difference between cool-season and warm-season growth potential

Larry Stowell from PACE Turf suggested that in addition to looking at C3 and C4 growth potential (GP) individually, as I had done in blog posts about overseeding timing at Kashima and at Dubai, it would be interesting to look at the cumulative sum of the difference between C3 and C4 GP.

New Chart: Daily Light Integral (DLI) and Growth Potential (GP)

To show the relative amount of photosynthetically active radiation (PAR) during the times of the year when the temperatures are close to an optimum for warm-season grass growth, I have made this new chart based on a series of calculations that give an estimate of the daily light integral (DLI).

New Motion Chart with Data for 56 World Cities

This chart contains the climatological normal data of temperature, precipitation, and sunshine hours for 56 world cities. Prompted by discussions with Dr. John Kaminski during the Asian Turfgrass Roadshow 2012, I've made this chart that includes four of the cities that we visited on our tour of Asia. Compared to the charts I've made previously, this one contains a greater range of cities from cool-season areas where C3 grasses are grown.

A New Way of Looking at the Weather

At the Sustainable Turfgrass Management in Asia 2012 conference at Thailand, I made a presentation entitled A New Way of Looking at the Weather in which I described the justification for presenting weather data in this format and showed how the bubble charts can be used to make better decisions about grass selection and turfgrass maintenance practices.

About these charts

Weather has a great impact on the growth of turfgrass. The carbon dioxide uptake that occurs in the photosynthesis of managed turfgrass is influenced by four primary factors: light, temperature, water, and nitrogen. Turfgrass managers are able to modify the plant water status and the leaf nitrogen content, but there is very little that can be done about light or temperature. With charts that show the average temperatures and sunshine hours, these uncontrollable factors and their seasonal influence on turfgrass growth can be easily observed.

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On Data, Charts, and Software

Data shown on these charts are from the World Meteorological Organization and, in the case of the Japan motion chart, from the Japanese Meteorological Agency.

The static charts were made using the ggplot2 package in R. Motion charts were made using the googleVis package in R. This document explains the procedure I used to make a motion chart with data from 52 world cities.

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