Calculations are needed for all kinds of applications in greenhouse production. For example, when mixing pesticides, or calculating the number of containers that will fit in a greenhouse based on spacing, or how much growing media to purchase based on the number of containers. This information is available in table format from:
"Conversion Tables, Formulas and Suggested Guidelines for Horticulture Use" (University of Georgia)
Back Pocket Grower™
http://Backpocketgrower.com from University of Florida
An easy to use on-line calculator for figuring stock solutions for injectors.
Click "tools" for calculations for chemicals, fertilizers, pesticides and PGR's
Click "Guides" for production information for spring greenhouse plug production
Four grower tools: AlkCalc, DLICalc, FertCalc and PGRCalc
See: Grower Tools for Greenhouse & Floriculture from Univ of New Hampshire
AlkCalc - This calculator provides the recommendations for the amount of acid to add to irrigation water in order to modify the pH and alkalinity levels. It also provides the amount of added phosphorus, nitrogen, and sulfur that the corresponding acids will provide, plus an economic comparison of each acid.
DLICalc - Estimates DLI from supplemental light sources and estimates hours of lamp operation
FertCalc - An on-line spreadsheet capable of calculating fertilizer formulations for water soluble fertilizers for up to four injectors.
PGRCalc - Web based calculator for plant growth regulator mixing rates.