HORDI Crop – Raddish

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Radish

Raphanus sativus L.

Radish belongs to the family Brassicaceae which can be grown in all agro-climatic zones of Sri Lanka. Well drained soil with pH between 6-7.5 is best for cultivation

Released Varieties

Climate requirements/ Areas suitable for cultivation

Radish can be grown in all agro-ecological regions in the country

Soil

Well-drained soils are suitable, poorly drained soils can cause growth problems. A pH range of 6.0 – 7.5 is appropriate for cultivation

Seed requirement

5 kg/ha

Nursery Management

A direct seeded crop

Land preparation

Soils should be ploughed to a depth of 30-40 cm to provide the necessary depth and fine tilth.

Planting

Can be grown throughout the year if adequate moisture is available.

Spacing

a) Spacing: 25-30 cm between rows; 10 cm between plants

b) Sow seeds in rows on raised beds.

Fertilizer

Time of application

Urea

kg/ha

TSP

kg/ha

MOP

kg/ha

Basal12520075
Top dressing – apply 3 weeks after planting12575

Water supply

Irrigate daily for the first 4-5 days and then every 3-4 days, depending on rainfall

Weed Control

One hand weeding is enough after 2 weeks of planting

Pest Management

Young larvae are light green in color and then turn into dark green when mature

Damage symptoms

In severe damage, leaves are skeletonized

Control

In severe cases, apply DOA recommended insecticides

Adult is a small fly and larvae cause the damage. Irregular or serpentine pale grey lines appear on both sides of the leaf blades as the larvae feed. These burrows are usually limited by the leaf veins and contain black fecal material visible as slim trace inside the tunnels

The caterpillar causes the damage. A well-developed caterpillar is about 4-6 cm long and black or brown in color.

Symptoms

  • Larvae hide in the soil during the day and cause damage at night
  • Eats young plants at the soil level
  • Eats leaves of mature plants

Management

  • Plough soil, pick up and discard caterpillars hiding in the soil.
  • Caterpillars in the soil are destroyed by birds when the soil ploughed.
  • Apply a suitable insecticide to the plant and soil on the day of planting.
  • Apply more organic manure to the soil
  • Keep fields weed free

Disease Management

Symptoms

When grown in low pH (acidic) soils it can cause serious damage to the crop. The roots of the plant become thick and club shaped.

Disease control

  • The causal organism remains in the soil for a long time and cannot be destroyed by chemicals.
  • Check the soil before planting and, if necessary, increase the pH by applying lime.
  • Uproot and burn the infected plants. Don’t use infected plants for compost preparation
  • Disease can be minimized by transplanting crops which are not in the same genus for about four years

Harvesting

Harvest when plants are at correct maturity stage (depend on the variety).

Delayed harvesting reduces the quality of the harvest.

Yield

a) Japanese ball: 40-50 t/ha

b) Beeralu Radish: 20-30 t/ha

Post-harvesting

a) Grade roots and handle them carefully to avoid mechanical damage

b) Pack roots in well-ventilated containers for long distance transport