Direct measures, in the context of this section, refer to fertilization measures.
For determining the rate and timing of nutrient supply, there are two concepts:
- The Quantity Concept: Based on the
nutrient requirement, a portion of the total amount is
applied at specific time intervals. This is common in open-field cultivation for vegetables,
nursery stock, and fruit.
- The Concentration Concept: The total
requirement is determined, and it is calculated what
concentration must be present in the irrigation solution in order to deliver the elements in this
quantity to the plant.
