Shiny is a web application framework for R. These Shiny apps make calculations, or generate charts, to provide answers or comparisons about fundamental turfgrass management practices.
Returns the reference and crop evapotranspiration for a day given inputs of latitude, maximum and minimum air temperatures, and crop coefficient. Based on the Hargreaves equation.
Returns the sustainability index (SI) based on soil test inputs. This is a direct comparison of input soil test results to the MLSN data.
Calculates the fertilizer K requirement given inputs of grass species, soil test K, and annual N rate. A diagonal line on the chart displays how the fertilizer K will change based on the amount of K in the soil.
Calculates the daily soil water balance using precipitation and evapotranspiration data for three locations in the Philippines, matching a user-specified set of irrigation rules.
Calculates the quantity of irrigation water required to satisfy a user-selected set of soil and irrigation conditions.
Plots the combination of climatological normal sunshine and temperature for 11 cities in Japan. This combination of sun and temperature gives an indication of the growing environment for turfgrass at different locations.
Returns the expected photosynthetic photon flux density (PPFD) for a second within any specified minute, given inputs of latitude, longitude, date, and time. Also returns expected daily light integral (DLI) at that location if it is sunny all day.
このプログラムは、標準蒸発散値(ETo) を、年月日、緯度、その日の最高気温と最低気温を基にしてmm 単位で計算します。算出された ETo に、作物係数を乗算すると、 その作物の蒸発散値（ETc）が求められます。これらの計算はHargreaves の ETo
ここでの計算は、持続可能な最低栄養 （MLSNガイドライン） をベースとしています。
This app from PACE Turf generates a downloadable avatar that shows two lines – blue and red. Blue is the cool-season growth potential through the year, and red is the warm season growth potential. We put this together in a hackathon when I visited PACE Turf headquarters a few years ago.