From a table with the consumptions in [L / m 2 ] as well as the surface area and planting frame of the crop, it is possible to calculate and control the dose of pepper irrigation , both by manual irrigation and by drip (controlling the time of irrigation).
CALCULATION OF THE IRRIGATION NEEDS OF PEPPER, TOMATO, EGGPLANT AND ZUCCHINI
From the tables shown, the irrigation of pepper, tomato, aubergine and zucchini can be technically calculated.
The water requirements vary with respect to the calendar depending on the date it is being grown (both outdoors and in the greenhouse). From the table of each crop, the value in [L / m 2 ] is selected, knowing the transplant date.
Here is an example of the calculation method. Depending on the crop, the tables are as follows:
If the transplant date happens in the 2nd half of July (July 16 to 31) and you want to know the irrigation dose for the first 15 days of August, for peppers, in the table we obtain the values ” 1.46 ” and ” 2.11 “. It is very cumbersome to correct the irrigation dose every 8 days, so in this example it is assumed that it is watered with the same amount of water for the first fortnight, so the average irrigation will be between 1.46 and 2.11 , whose result is 1,785 L / m 2 per day . Anyone who wishes to establish an equalizing irrigation dose for the entire month will simply establish the average of the values offered for the month of August. (Irrigation efficiency will be lower, but appropriate for any non-commercial crop).
Let’s take the example that we have 30 m 2 of pepper cultivation.
Pepper irrigation dose [L / m 2 ] = Surface (m 2 ) · Volume of water (L)
Irrigation dose [L / m 2 ] = 30 · 1.785 = 53.55 L / day, for 30 m 2
Even more precisely, if we know the daily dose of irrigation for each plant (pepper, tomato, eggplant or zucchini), knowing the distribution per m 2 of the number of plants, for example 4 m 2 (it has 120 plants) dose daily irrigation of the pepper, for each plant, would be 0.44625 L / plant and day
CALCULATION OF THE WATER DOSE FOR DRIP IRRIGATION
First it is necessary to calculate the flow rate [L / s] of each dripper, as well as the distribution per m 2 . Knowing this value is simple and can be obtained by placing a bucket under a dripper in operation at a controlled time (1 min, 30 s, etc.) and then measuring the volume of water. If, for example, the irrigation flow were 3 L / h and there were 2 drippers in 1 m 2 , the daily irrigation time would be:
There are other guidelines to correct this value, such as solar radiation or the electrical conductivity of water (the higher the concentration of salts, the greater the amount of irrigation) that will be discussed later.