Tomato Growing Program: Practical Guide for Global Production

By Ihumate

Ripe tomato fruits

Table of Contents

Crop Background and Variety Selection

  • Select the type by market: large fresh-market tomato, cluster tomato, cherry tomato or processing tomato. Do not mix fresh-market and processing goals in one management plan.
  • For open fields, prioritize crack resistance, heat tolerance, virus resistance and shelf life. For greenhouses, prioritize indeterminate varieties with continuous fruit set and uniform fruit shape.
  • Check resistance codes such as TYLCV, ToMV, TSWV, V, F and N. Hot regions need virus resistance and heat tolerance; continuous-cropping fields need resistance to wilt, root-knot nematodes and bacterial wilt.
  • Transplants should have 4-6 true leaves, strong stems, short internodes and dense white roots, without aphids, whiteflies, mosaic symptoms or root galls.

Soil Preparation and Planting

  • Choose deep, well-drained soil with enough organic matter. Tomatoes perform best in slightly acidic to neutral soil, with pH around 6.0-6.8.
  • Test soil before planting, especially pH, EC, organic matter, nitrate nitrogen, available phosphorus, available potassium, calcium, magnesium, boron and root-knot nematodes.
  • Avoid continuous planting after solanaceous crops. Tomato, pepper, eggplant and potato rotations increase bacterial wilt, fusarium wilt, nematodes and soil-borne disease pressure.
  • Apply fully composted organic fertilizer or compost and incorporate it with basal fertilizer. Fresh manure can burn roots, introduce pathogens and raise soil salinity.
  • Raised beds are better for rainy regions and greenhouse drip irrigation. Plastic mulch or organic mulch reduces soil splash, conserves water and suppresses weeds.
  • Adjust spacing by variety and pruning system. Indeterminate tomatoes are usually trained as one or two stems; determinate and processing tomatoes can be planted more densely.
  • Irrigate immediately after transplanting. Before plants recover, avoid high-concentration fertilizers; focus on rooting, salt control and stable moisture.

Nutrient Management

  • Principle: build roots and canopy early, stabilize flowering and fruit set in the middle stage, raise potassium and calcium during fruit expansion, and avoid excess nitrogen late in the season.
  • Basal fertilizer: supplement phosphorus, potassium, calcium, magnesium and organic matter according to soil tests. Place phosphorus near the root zone to support transplant recovery and root growth.
  • Nitrogen: apply small split doses in seedling and vegetative stages. Reduce nitrogen if leaves are too dark, internodes are too long or flowering is weak.
  • Potassium: increase supply after the first cluster starts fruit expansion. Deficiency reduces fruit size, coloring, sugar-acid balance and storability.
  • Calcium: maintain stable calcium after flowering and fruit set, especially under heat, drought, salinity or weak roots, to reduce blossom-end rot. Calcium uptake depends on steady water and active roots.
  • Magnesium, boron, zinc and iron: high-yield and greenhouse tomatoes often need micronutrient correction. Use EDTA chelated micronutrients by foliar spray or fertigation after diagnosis.
  • Humic acid: use after transplanting, in replanted soil, saline soil or weak-root fields to improve soil structure, fertilizer efficiency and white root growth.
  • Amino acids: useful for transplant recovery, low light, heat, drought, phytotoxicity recovery and continuous picking periods, mainly by foliar spray or fertigation.
  • Seaweed extract: apply before flowering, after fruit set and before stress to support roots, fruit uniformity and recovery. It does not replace NPK.
  • Fertigation: drip-irrigated tomatoes should receive low-concentration, high-frequency fertilizer to avoid EC spikes and root injury.

Irrigation Recommendations

  • Avoid alternating drought and excess water. Stable root-zone moisture reduces cracking, blossom-end rot and flower or fruit drop.
  • Use small frequent irrigation during transplant recovery; avoid drought or flood irrigation during flowering; increase water during fruit expansion with potassium and calcium feeding.
  • Prefer drip irrigation to reduce leaf humidity and disease pressure. Drain open fields in rainy seasons and avoid long-term high humidity in greenhouses.
  • Morning irrigation is safer. Heavy evening irrigation raises night humidity and increases leaf mold and gray mold risk.
  • In saline soils or substrate systems, monitor EC. If leaf edges scorch, roots brown or growth stops, check salinity and drainage first.

Pest and Disease Management

  • Core practice: healthy seedlings, rotation, field sanitation, ventilation, humidity reduction, yellow/blue sticky traps and early action are more effective than heavy late spraying.
  • Whiteflies and aphids: focus on virus prevention. Use insect screens in nurseries and greenhouse entrances, and rotate mineral oil, soap solution or registered pesticides when populations rise.
  • Leafminers and tomato leaf miner: remove heavily infested leaves, use traps and biological control, and rotate pesticide modes of action if needed.
  • Gray mold, leaf mold, early blight and late blight: avoid long leaf wetness, remove old leaves and improve ventilation. Prevent before rainy or high-humidity greenhouse periods.
  • Bacterial wilt, fusarium wilt and root-knot nematodes: prioritize rotation, resistant rootstock grafting, solarization, composted organic matter and beneficial microbes. Remove diseased plants with roots.
  • Biopesticides: Beauveria bassiana, Bacillus thuringiensis, Trichoderma, Bacillus subtilis, matrine and botanical products can support IPM, but work best at low pressure or early disease stages.
  • Follow local registration, label rates and pre-harvest intervals. Rotate modes of action to reduce resistance.

Harvest and Post-Harvest Handling

  • Choose harvest maturity by market distance. Harvest at breaker stage for long-distance shipping and pink to red stage for local fresh markets.
  • Handle gently and avoid compression, abrasion and sun exposure. Do not seal wet fruit in piles after rain.
  • Grade out cracked, diseased, insect-damaged, misshapen and mechanically injured fruit. Diseased fruit accelerates decay in the whole box.
  • Tomatoes are sensitive to chilling. Mature-green and breaker fruit should not be stored too cold for long periods. Match storage temperature with maturity to avoid chilling injury and flavor loss.
  • Keep fruit dry and ventilated before packing. Use clean crates and keep away from pesticides, fuel and strong odors.

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