Plants require nutrients in order to grow. The roots absorb the nutrients from the water as dissolved salts. These are the simple compounds found in chemical fertilizers. Organic fertilizers travel a more circuitous route, first breaking down from complex molecules through microbial action, and then dissolving into the water. Nitrogen (N), Phosphorous (P) and Potassium (K) are called the macro-nutrients because plants use large quantities of them. The percentages of N, P and K are always listed in the same order (N-P-K) on fertilizer packages. Calcium (Ca), sulfur (S), and magnesium (Mg) are also required in fairly large quantities. They are often called secondary nutrients. Smaller amounts of iron (Fe), zinc (Zn), manganese (Mn), boron (B), cobalt (Co), copper (Cu), molybdenum (Mo), and chlorine (Cl) are also required to grow cannabis seeds like white widow feminized. These are called the micro-nutrients.
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