Fertilize the soil to plant tomatoes It's the fundamental starting point for enjoying a bountiful, tasty, and healthy harvest. Choosing the right fertilizer, application technique, and optimal timing can make the difference between vigorous, productive plants or, conversely, stunted, disease-prone crops. If you want to grow tomatoes and get the most out of your soil, here's everything you need to know, combining traditional techniques, current recommendations, and advice based on the most successful experiences of gardening experts and enthusiasts.
The importance of fertilizing the soil to plant tomatoes
Tomatoes are one of the most popular vegetables in urban and home gardens due to their versatility in the kitchen and their many varieties. However, their cultivation is more demanding than it seems, and the Soil preparation is crucial for optimal plant development. and the quality of the fruits.
- Provide key nutrients: Soil alone is often insufficient to meet the needs of tomatoes, a nutrient-demanding plant. Fertilizer provides nitrogen, phosphorus and potassium, essential elements that contribute to the development of roots, stems, leaves and, above all, fruits.
- Physical and biological improvement of the substrate: Using organic fertilizers such as compost or manure helps make the soil more fertile. airy, spongy and rich in microorganisms, thus facilitating the absorption of water and nutrients.
- Water retention capacity: A soil enriched with compost retains moisture better, which reduces water stress on the plant during periods of drought.
- Greater resistance to pests and diseases: Plants grown in fertile and balanced soils are more resistant, reducing the incidence of phytosanitary problems.
- Increase in quantity and quality: Proper soil management results in larger, tastier fruits with higher sugar and nutrient content. It also promotes continued production throughout the season.
What type of fertilizer can be used to plant tomatoes?
The choice of fertilizer depends on the type of crop, soil characteristics, and growing methods (in the ground, in pots, under cover, etc.). Below, we explain the most commonly used fertilizers, always recommending prioritizing organic fertilizers for their long-term benefits to the soil.
Recommended organic fertilizers
- Compost: Obtained from the decomposition of plant and organic remains, compost gradually provides nutrients and improves the physical structure of the soil.
- Manure: Coming from animals (horse or cow are usually preferred), Well-composted manure provides stable organic matter and micronutrients. It is advisable to apply it in autumn or at least a few weeks before sowing to avoid phytotoxicity.
- Earthworm humus: Considered one of the most balanced fertilizers, rich in both nutrients and beneficial microorganisms. Ideal for application during the growing season, providing vigor and resistance to the plant.
- Guano: Fertilizer of animal origin (mainly birds or bats) especially rich in nitrogen and phosphorus. It is used diluted in water to avoid excess.
Other products and soil improvers
- Peat: Its use, although increasingly regulated for environmental reasons, helps retain moisture and improves the texture of light soils. It's ideal for potting mixes or very sandy soils.
- Animal manure: Pre-treated pig slurry applied in appropriate doses can provide a rapid supply of nutrients, especially during the initial development stage.
Chemical fertilizers and mineral fertilizers
Although there is an increasing trend towards organic farming and the reduction of synthetic fertilizers, in some cases the NPK fertilizers (mixtures of nitrogen, phosphorus and potassium) may be necessary, especially if the soil is poor or if a quick boost is desired at specific times.
- Granulated fertilizers: They are applied to the ground and are released progressively depending on irrigation or rainfall.
- Liquid fertilizers: They are used in irrigation water for immediate absorption, ideal for application during specific phases such as flowering or fruiting.
- Foliar fertilizers: They are preparations that are applied directly to the leaves to correct specific deficiencies that the plant may experience during its development.
How to choose the right fertilizer according to the tomato cycle
The type and quantity of fertilizer to be used varies depending on the stage of plant development:
- Seedlings and early development: Greater amount of nitrogen to enhance vegetative growth (leaves and stems).
- Flowering: Balanced NPK fertilizers to promote flower formation and prepare the plant for fruiting.
- Fructification: Increase of potassium to improve the size, flavor and color of the fruits.
Before overpaying, it is advisable analyze the soil If possible, to know the starting nutrients and adjust the doses.
How to prepare and fertilize the soil for planting tomatoes: step by step
- Land cleaning: Remove weeds and debris from previous crops to prevent the transmission of pests and diseases.
- Tilling and aeration: Till the soil to a depth of at least 30 cm to promote root development and oxygenation of the substrate.
- Marking the rows or planting lines: Leave some 80 cm between lines to be able to work and for the plants to receive sufficient light and air circulation.
- Opening of furrows: Use hand tools (hoe, spade) to open furrows where the fertilizer will be applied.
- Application of fertilizer:
- Organic fertilizer (compost, manure, worm castings): Spread an even layer at the bottom of the furrow. You can use about 5 kg of worm castings per row of 20-30 plants; 10-15 kg of well-aged manure per row. Remember not to overdo it to avoid burning the roots. You can find out more about how to fertilize tomato crops..
- Granulated fertilizers: Spread the granules over the surface according to the package instructions and make a light mix with the soil.
- Liquid fertilizers: Dilute in irrigation water and apply before planting.
- Mixing the compost with the soil: Cover the compost with soil from the sides and hoe or till again to ensure proper integration.
- Preparing the planting holes: Sow seeds or seedlings in prepared holes, taking care never to bury the seeds/seedlings directly in pure compost.
Fertilization in protected crops and pots
For those who grow tomatoes in pots, planters or urban gardens, the key is to mix Universal substrate, organic fertilizer such as compost or worm humus and some sand If the soil is very compact, the pot should be at least 30 cm in diameter and have good drainage at the base. It is recommended to add a layer of humus at the time of planting and add liquid or granular fertilizers every 15-20 days during growth.
- In very clayey soils: Add coarse sand to improve aeration and prevent waterlogging.
- In sandy soils: It is advisable to incorporate organic matter to increase water and nutrient retention.
Essential care after fertilization
- Irrigation: Maintain constant humidity but avoid flooding, especially in the early stages. Drip irrigation is ideal for maintaining moisture and facilitating the absorption of liquid fertilizers.
- Mulching: Cover the soil with straw, dry leaves, or bark to retain moisture, prevent weed growth, and encourage the activity of beneficial microorganisms.
- Pruning and staking: Remove side shoots and lower leaves to promote aeration, ripening, and prevent diseases such as mildew.
- Pest control: Watch for the appearance of aphids, spider mites, and worms. Use organic products when necessary and regularly check the plant's condition.
- Additional fertilizer contributions: During the tomato cycle, you can apply liquid fertilizers every 15-20 days, especially during the fruit formation phase.
Common mistakes and expert tips for efficient fertilization
- Do not overdo it with fertilizers: Excessive fertilizer can cause excessive leaf growth, which can be detrimental to fruit and increase susceptibility to disease.
- Do not bury seeds or seedlings directly into pure compost: It can cause burns and stunt development.
- Intersperse organic and mineral fertilizers: Alternating both types allows for maintaining a fertile and balanced soil in the long term.
- Perform soil analysis if possible: This helps to adjust doses and avoid unnecessary expenses.
Fertilizing your soil before planting tomatoes is crucial to ensuring a quality harvest. By choosing the right fertilizer, preparing the soil properly, and following the correct application schedule throughout the growing season, you'll enjoy strong, resilient plants and a production of tomatoes rich in flavor and texture. Protect yourself from pests like red spiders and other problems and share your results to keep improving every season.
