Introduction

Tomato is one of the most widely grown and consumed vegetables in the world. It is a key source of vitamins A and C and is used fresh, cooked, or processed into paste, sauce, and juice. In Nigeria and many other tropical countries, tomato farming provides income for thousands of smallholder farmers and plays an important role in food security.

This updated guide provides practical, easy to understand information on tomato production, including climate needs, variety selection, seedling management, transplanting, field preparation, and nutrient management.

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Climate and Soil Requirements for Tomato

Tomatoes grow best in warm weather. The ideal temperature range is between 20°C and 27°C.

• Fruit setting reduces when temperatures rise above 30°C
• Growth slows when temperatures fall below 10°C

Tomatoes prefer well drained soils because they are sensitive to waterlogging. Poor drainage can lead to root diseases and low yields.

The ideal soil pH for tomato production is between 6.0 and 7.0. A simple soil test can help farmers determine whether lime or other soil amendments are needed.

Crop Rotation

Tomatoes benefit greatly from crop rotation. Planting tomatoes after crops like paddy rice can help reduce disease and nematode problems.

Avoid planting tomatoes after:

• Pepper
• Eggplant
• Irish potato
• Any other solanaceous crop

These crops share similar pests and diseases, which can remain in the soil and infect new tomato plants.

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Choosing the Right Tomato Variety

Selecting the right variety is one of the most important decisions in tomato farming. Yield, market demand, disease resistance, and climate adaptation all depend on this choice.

1. Fruit Type

Tomato varieties fall into three main market groups:

Fresh market varieties
These are usually red but may vary in size, shape, and color. They are sold for direct consumption.

Cherry tomatoes
Small fruits weighing less than 30 grams. They grow in clusters and are popular in salads.

Processing varieties
These have deep red color and high solid content. They are ideal for paste, ketchup, and sauces.

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2. Plant Growth Habit

Tomato plants are also grouped based on how they grow.

Determinate varieties
Short and bushy. They stop growing once a flower cluster forms. They mature at about the same time and are easier to manage.

Semi determinate varieties
Slightly taller than determinate types and produce fruit over a short period.

Indeterminate varieties
Continue growing and producing flowers throughout the season. They grow tall and require staking and pruning. However, they provide a longer harvest period and steady income.

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3. Disease Resistance

Common tomato diseases in tropical regions include:

• Bacterial wilt
• Bacterial spot
• Fusarium wilt
• Tomato yellow leaf curl virus
• Gray leaf spot

Many improved varieties are resistant to one or more of these diseases. Farmers should always check seed packets for resistance information before planting.

The Horticulture International research emphasizes the importance of choosing varieties suited to local conditions.

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4. Seasonal Adaptation

Most tomato varieties perform best in the dry season. However, heat tolerant varieties that set fruit above 30°C can be grown during hot periods when market prices are higher.

Wet season production requires:

• Raised beds
• Good drainage
• Possible use of shelters
• Careful disease management

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Hybrid or Open Pollinated Varieties

Hybrid seeds often produce higher yields and more uniform fruits. However:

• Hybrid seeds are more expensive
• Farmers cannot save seeds for replanting

Open pollinated varieties allow farmers to save seeds, reducing production costs.

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Seedling Production

About 250 grams of seed are needed to plant one hectare of indeterminate tomatoes. Determinate varieties require about 125 grams.

Seeds should be sown 0.5 cm deep. At soil temperatures between 20°C and 30°C, seedlings emerge within 8 days.

Tray Method

Growing seedlings in trays produces stronger and healthier plants. Use well drained media such as:

• Peat moss
• Potting soil
• A mix of sand, compost, and rice hull

Sow two seeds per hole and thin to one healthy seedling after the first true leaves appear.

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Seedbed Method

Choose a well drained site that has not recently grown solanaceous crops.

To reduce soil borne diseases:

• Burn rice straw lightly on the seedbed
• Prepare raised beds about 15 cm high

Sow 750 to 900 seeds per square meter in rows 6 cm apart. Keep the soil moist but not waterlogged.

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Fertilizing Seedlings

At the two leaf stage, apply one of the following:

• 0.5 percent ammonium sulfate solution
• 0.25 percent urea solution
• 0.1 percent NPK solution

Avoid excess nitrogen, as it can cause tall, weak seedlings.

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Pest and Disease Protection in Nursery

Fungal diseases can cause damping off. Fungicides such as Ridomil Gold may be used where necessary.

Insects like whiteflies, thrips, and aphids can spread viruses. Covering seedlings with fine mesh netting helps prevent infestation.

More on pest management can be found here:
https://www.agriculturenigeria.com/farming/sustainable-agriculture-in-nigeria/

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Transplanting Tomatoes

Seedlings are ready for transplanting at four to five leaves, about four weeks after planting.

Before transplanting:

• Reduce watering slightly
• Expose seedlings gradually to sunlight

Transplant in the late afternoon or on a cloudy day to reduce stress.

Place seedlings deep enough so cotyledons remain above soil level. Press soil firmly and water immediately.

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Plant Spacing

Spacing depends on variety and management system.

For indeterminate varieties:

• Two rows per 1 meter bed
• 60 cm between rows
• 40 cm between plants
• About 33,333 plants per hectare

For determinate varieties:

• One row per bed
• 40 cm between plants
• About 16,666 plants per hectare

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Field Preparation

Prepare raised beds to improve drainage and irrigation efficiency.

• Bed width about 1 meter
• Furrows about 50 cm wide
• Bed height 20 cm in dry season
• Bed height 35 cm in wet season

Mulching with rice straw or plastic helps:

• Conserve moisture
• Reduce weeds
• Minimize nutrient loss

If temperatures exceed 28°C, cover plastic mulch with straw to prevent overheating.

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Nutrient Management

Tomatoes require balanced fertilization for high yield.

To estimate nitrogen needs:

Target yield in tons per hectare × 2.4 = Nitrogen required in kg

For example, a 40 ton per hectare target requires:

40 × 2.4 = 96 kg Nitrogen

Phosphorus and potassium needs are calculated as:

Nitrogen × 0.35 = P2O5
Nitrogen × 1.45 = K2O

So for 96 kg Nitrogen:

96 × 0.35 = 34 kg P2O5
96 × 1.45 = 140 kg K2O

Half of the fertilizer should be applied at planting. The remaining half should be applied at first fruit set.

Common fertilizer ranges in the tropics:

• 60 to 120 kg Nitrogen per hectare
• 60 to 140 kg P2O5 per hectare
• 60 to 120 kg K2O per hectare

A soil test is strongly recommended before fertilizer application.

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Disclaimer

This article is for informational purposes only. Agriculturenigeria.com makes no guarantees about the completeness or accuracy of this information and will not be liable for any losses arising from its use. Farmers are encouraged to consult local agricultural extension officers before making major production decisions.

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Source: Adapted from research published by Horticulture International.