Why is the urea form of nitrogen not sensed by an EC soluble salt ...

[Jipu 123]

Why is the urea form of nitrogen not sensed by an EC soluble salt meter?
 
  What will be an ideal response?

Question 2

CO2 is injected into greenhouses from the months of _________________ through _______________. Each day in this period, it is injected for the time period from ___________________ ________ unless the following happens: ______________ .
 
  Fill in the blank(s) with correct word

[izzat]

Answer to Question 1

The meter can only detect electrically charged nutrients. Urea is a neutral
nutrient.

Answer to Question 2

Sept or Oct through April or May, 30 minutes before sunrise to sunset,
unless the exhaust fans turn on or the ventilators are open more than 2 inches.

[Jipu 123]

Thanks for the timely response, appreciate it

[Joy Chen]

Wow, this really help