Agriculture Reference
In-Depth Information
Figure 5.18 - This is a picture of two cheap pH meters that can be
purchased from most grow shops.
NUTRIENTS
The three major nutrients that are found in soil are Nitrogen,
Phosphorous and Potassium or NPK for short. NPK can come in two
forms - with the soil or as a stand-alone fertilizer (usually in a bottle).
When you look at the bag you will see that the % of each part is stated.
Such as 20:20:20. This means 20% N, 20% P, 20% K. The remaining
40% is just other elements that make-up the soil. In liquid it would
usually be water. This ratio can change between different types of
nutrient and soil brands so we need to understand what Cannabis likes.
Cannabis plants like good levels of N and a normal level of P
and K during vegetative growth. You need to pick a bag that has all
three, not just 10:20:0. When looking at chemical fertilizers you need
a mixture that has the first number higher or equal to the rest. 12-12-
