Watering tomatoes: how much water do you need?

Tomato is a crop very demanding of water and nutrients. In addition, when grown outdoors, it is usually planted in spring and harvested throughout the summer, so with high temperatures, irrigation of tomatoes is a key factor in obtaining good productions.

What amount is appropriate? Good It’s very difficult to saysince it influences the climatology (temperature and relative humidity), the type of soil, the development of the plant, etc.

However, for those who are starting to grow tomatoes, we are going to establish approximate values ​​that everyone can adapt according to the situation of their cultivation, since it is not the same to cultivate in the summer in the region of Murcia as in Asturias. , where temperatures and humidity change completely.

To establish the irrigation of the tomato, we will differentiate the outdoor grown tomato and the greenhouse tomato.


Outdoor watering of tomatoes

Considering an area with warm temperatures and direct sun, and a tomato transplanted outdoors in early or mid-spring and production until the end of September:

  • Transplant until flowering (spring): 0.5-1 L/m2 and day.
  • Flowering and production of the first bunches of fruit (until July 15): 1-1.5 L/m2 and day.
  • Full production (2nd half of July, August and September): 1.5-2.0 L/m2 and day.

This doesn’t mean it needs to be watered every day, although it is recommended during the hotter summer months. This means that if it is watered day after day, the amount accumulates. In this case, we would speak for the beginning of summer of a quantity of 3 L/irrigation.

Data correction: To determine whether to use the lower or higher rate, the soil moisture should be checked at a depth of 10 cm (using a small hoe or a shovel). If the humidity is light, we will keep the lower dose. If the humidity is very low or almost imperceptible, we will go up to the higher dose.

We repeat the operation after a week to check that everything is fine.

Greenhouse tomato irrigation

According to the date of transplant. Water dose in L/m2 and day

MONTH THE WEEK August 15-31 September 1-15 September 16-30 October 1-15
AUGUST 3rd week4th week 0.700.72
SEPTEMBER 1st week 2nd week 3rd week 4th week 1,682,483,093.41 0.690,661,241.78


OCTOBER 1st week 2nd week 3rd week 4th week 3,573,042,752.39 2,252,382,592.39 0.871 211,541.72 0.450,380,40.8
NOVEMBER 1st week 2nd week 3rd week 4th week 2,041,841,71,41 2,041,841,71,41 1,721,761,71,41 0.941.051.151.08
DECEMBER 1st week 2nd week 3rd week 4th week 1,171,090,990.97 1,171,090,990.97 1,171,090,990.97 0.991.00.980.97
January 1st week 2nd week 3rd week 4th week 0.991.051.031.14 0.991.051.031.14 0.991.051.031.14 0.991.051.031.14
FEBRUARY 1st week 2nd week 3rd week 4th week 1,311,331,391.39 1,311,331,391.39 1,311,331,391.39 1,311,331,391.39
MARCH 1st week 2nd week 3rd week 4th week 1,481,631,932.07 1,481,631,932.07 1,481,631,932.07 1,481,631,932.07
APRIL 1st week 2nd week 3rd week 4th week 2,422,592,853.02 2,422,592,853.02 2,422,592,853.02 2,422,592,853.02

source cajamar.es

If you want to go deeper into the subject, according to the Autonomous Community of origin, there are online consultation programs where, providing a series of data on the cultivation and irrigation of tomatoes, they establish a Fertigation schedule with time and frequency.

For example, the one for the Region of Murcia is this one, through Siam (Agrarian Information Service of Murcia).

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In the blog we have a lot of information about tomato cultivation and its varieties. If you have specific questions, check out our entire manual where you’ll find the solution to many common problems in this culture.

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