Soil Ph for Tomatoes

Soil Ph for Tomatoes

Needless to say, tomatoes growth, strength, and other essential qualities depend on the quality of the soil ph. But for every gardener or amateur gardener, the question is always open how to prepare the best soil for tomatoes.

First, tomatoes love phosphorus. No, not so that the gardener could find them on a dark summer night. Phosphorus is extremely important for fruit formation in tomatoes. It is the lack of this “glowing” mineral that causes the color change in tomatoes, they become faded, one might even say cyanotic.

One can, of course, appeal to the fact that tomatoes take much less phosphorus from the soil than other minerals. But it is precisely the lack of phosphorus that will make the future harvest inferior. Also, for growing tomatoes, the soil must contain sufficient potassium and nitrogen. Potash, nitrogenous, and phosphate fertilizers, applied in sufficient quantities to the soil, are the key to successful cultivation and a rich harvest of tomatoes.

In addition to the mineral composition, tomatoes love light, loose, well-moisturized soil. They grow well in places that have a low level of groundwater. If the soil retains moisture, the earth is waterlogged, the water stagnates, then it is not recommended to plant tomatoes in such a place.

In terms of acidity, the soil for growing these vegetables should be slightly acidic – pH 6-6.5, acidity 7.5 pH too high for tomatoes If the soil is more acidic, then liming is necessary before planting tomatoes. Tomatoes also love warmth, everyone knows that, so if the weather conditions are not too favorable, tomatoes are grown in greenhouses.

How do you lower the pH of a tomato plant?

So, what acidity of the soil should be known for tomatoes is no more than 6.5. If the ph tomatoes are higher than normal, the tomatoes will be sore. You can determine the acidity of the earth yourself, just look at the weeds that grow on it. In areas with a low ph level, creeping wheatgrass grows, an almost indestructible pest. But in very acidic soil, woodlice feel good, so the thickets of this grass clearly indicate that the soil for tomatoes must be deacidified.

It is not difficult to check acidity at home. To do this, boil currant leaves with boiling water and let the broth brew. Then add a little soil from the site to the jar and watch the reaction. If there is a lot of acids, the water will turn red, blue indicates low ph, and green indicates neutral soil.

What to use to deoxidize the soil:

  • Lime. In autumn, 1 m2 of land is poured into a bucket of fluffy lime, and then the soil is loosened. Mulching for the winter is not recommended, in the spring such soil will thaw for a long time. If the alkaline reaction is too high, sulfate granules are added to the soil.
  • Dolomite flour. For 1 m2, ¾ of a bucket of flour is used, and then the soil is poured for winter.
  • Ash. For the first time, take a three-liter can of ash per 1 m2 of soil, the next year the amount of fertilizer can be reduced.
  • Phacelia. The beautiful lilac flowers grow quickly, reduce the acidity of the earth and prevent wireworms. The plot is sown with phacelia for the whole summer; next year, tomatoes can be grown in such soil.

From the point of view of the ph level, peat is suitable for tomato seedlings, it has low and sometimes neutral acidity. The main disadvantage of such soil in the absence of a large amount of nutrients, the peat soil will need to be refined with turf, sand, and organic matter.

Important!  Peat is often used as an inert component in the soil, but it should be remembered that its horse variety is more acidic. Such peat must be deacidified before planting tomatoes.

Folk advise for preparing the beds for growing tomatoes

If you don’t have your own compost, purchased vermicompost or sapropel (silt from the bottom of freshwater lakes and rivers) will do.It is known what kind of soil tomatoes love, but what if the soil on the site does not quite meet the requirements? Here are some tips from seasoned gardeners on how to prepare the soil for planting and growing tomatoes:

  • Seedlings grow well on a mixture of sawdust and sand in a ratio of 2 to 1. For additional nutrition, such soil is impregnated with mineral fertilizers.
  • Hardwood sawdust is an excellent baking powder. Stale sawdust is best suited, fresh ones must first be soaked in boiling water and squeezed out. Next, wet sawdust is mixed with urea (about 40 g of the substance is enough for one bucket), they are added to the soil already slightly dried.
  • If the soil is acidic, it must be treated with ash every two years, or lime added every four years.
  • Before planting tomatoes on open ground, the beds must be treated with antifungal drugs.
  • The soil for growing tomatoes must be loose – the roots of the plants are rather weak, it is difficult for them to absorb nutrients when the soil is too dense.
  • Tomatoes grow best in those beds where cucumbers, pumpkins, potatoes, onions, or cabbage were cultivated before them.
  • Mulching after planting tomatoes prevents weeds from appearing in the beds. You can use thin scraps of newspaper, the paper will gradually rot in the garden while retaining moisture.

Subject to simple recommendations, tomatoes will quickly take root after planting in the ground and will grow.

So, what kind of soil do tomatoes need? Tomatoes can grow in almost any kind of outdoor or greenhouse soil, as long as they have enough moisture, nutrients and light. It is better to use mixtures containing peat, sand, humus, and humus with the addition of mineral fertilizers. Such substrates can be prepared by hand or purchased at a specialized store. It is also important to monitor the ph tomatoes and keep it at 5.5 – 6.5, deoxidizing the soil if necessary.

Good luck!


  1. M

    Jessica on October 2021

    A very good accessible article, I faced such a misfortune two years ago, tomatoes, cabbage, eggplants stopped growing. It turned out that the soil is acidic, the roots do not develop at all and the plants die. This year, 60 tomatoes, 30 eggplants, 30 cabbage have gone missing. She pulled everything out and planted it with mustard. In the fall, I want to add dolomite flour. In general, there are a lot of problems. The vegetable garden is no longer happy, she cried for a whole month, the second year without a crop.


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