1. Variables Lab 10/4/17, 10/9
If you went to the college fair: Please copy the lab on loose leaf to put into your lab book for next class.

2. Do Now………...10/9/17
In your LAB section copy and answer the Probe/ Hypothesis question
Title: Monitoring Greenhouse Variables Date: _______
Essential Question: How do we monitor and control greenhouse variables?
Probe/Hypothesis: What variables do you think we can monitor in the greenhouse? Put an asterisk * by those you think we can control
Analysis Questions (left side page)
Complete the variable chart for today and each time we enter the greenhouse.
What variables can we control? Which can we not?
What is the ideal pH and electroconductivity?
What would you do if the pH were 8? What would you do if it were 4?
What would you do if the electroconductivity was 3.0 m/S?

3. Analysis Questions: Check your answers
Variable chart for 3/9: Electroconductivity was 2.6. This is a measure of how much chemicals (nutrient salts) are dissolved in the water. Ideal EC=3.0 mS/M (milliSiemens per meter).
pH: was 7.5. This is a measure of the “power of hydrogen.” It is a measure of the acidity of a solution.
What variables can we control? Which can we not?
We can control: pH and electroconductivity, temperature with a heater and fans, sunlight to a degree (with a tarp)
We cannot control: climate (number of hours of sunlight)
What is the ideal pH and electroconductivity? pH= 6.0, EC= mS/cm
What would you do if the pH were 8? It is too high. We can add pH down
What would you do if it were 4? It is too low. We can add water or pH up.
What would you do if the electroconductivity was 3.0 m/S? Nothing. It is perfect.

4. Lab book pages: make sure your lab book is complete
Inside front cover: Data recording for system variables per day
Page 1: About the Author Page
Table of Contents. Number all pages in your book
Lab book rubric
Performance Rubric
Variables Lab
Seeding Lab/Transplanting Lab