This is the big question of all amateur gardeners!
Too much water can rot the roots of some plants or cause various diseases.
Too little water means that the fruit does not grow well or does not grow well, the plant dries up and can die.
A magic number to remember: 2.5
Either 2.5 cm or 1 inch of water per week for a plant.
Of course all plants have different needs, for example tomatoes usually need more and garlic much less. Excellent gardening books, such as Bertrand Dumont's, give you a general indication: little, average, a lot of water. See our overview table below!
2.5 cm, okay, but in liters? … And what do we mean by 2.5 cm of water? Where is this 2.5 cm?
In fact, this is an average of one inch of water per week for a plant, which is actually one inch of water (in height) multiplied by the approximate area of 12 inches by 12 inches. cm. This provides us with 2,250 cubic centimeters of water, or 2.25 liters of water per week! This is a lot of water, you will probably want to water 2-3 times with less water at a time.
Many plants in a square in a pot or vegetable garden?
You do not have to calculate separately for all plants! It is quite simple, we simply calculate the total area of the pot, approximately, or the kitchen area (eg: Vegetable Garden Square). Examples of the calculations below!
A plant or pot versus an entire vegetable garden
If I put tons of plants in a small area, why not calculate the water per plant instead of the area as suggested?
The water given to a small single plant, soil or pot, is partially lost through runoff and evaporation. In fact, the average measurement of 2.25 liters per week takes the losses into account. But the more plants there are in a small space, the less water is lost, because the more roots there are to collect the water, the more leaves there are to keep moisture on the ground and prevent evaporation. So you can rely on the suggested water calculation all season (except when your plants are in seedling or small seedling state).
Example # 1) A red pepper plant
30 xm X 30 cm X 2.5 cm = 2250 cm3, so 2.25 liters per week.
Example # 2) A small balcony pan of 1m by 40cm
100 cm X 40 cm X 2,5 cm = 10,000 cm3, so 10 liters per week
Example # 3) A 4 ‘by 4’ square kitchen garden
122 cm X 122 cm X 2,5 cm = 37210 cm3, so 37 liters per week.
Summary in step
1) The cultivated area (area in cm2) is calculated
2) Multiply by 1 inch to get the volume of water. The result is in cm3.
3) We take the volume in cm3 and convert it to liters to make it more practical! Google cm3 converter in liters
The question then is: which drippers should I choose based on the water needs of my plants, and how long should I water? See the ticket, choose the drippers and the watering time.