HORDI Crop – Sweet Potato

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Sweet Potato

Ipomea batatas

Originated in southern American Tropical countries. Cultivated throughout the year with irrigation easy management due to low input requirement, short duration and low pests and disease problems.

Released Varieties

Climate requirements/ Areas suitable for cultivation

Can cultivate throughout the country except arid zone temperature in between 20-40.

Soil

Sandy/ loam soil with good drainage is suitable.

Cutting requirement

For 1 ha – 55,000 – 60,000 cuttings.

Nursery Management

Nursery has to be practice for every 5 season to increase vigor. Maintain nursery for tuber planting and get cuttings from the tubers from the nursery for field planting.

Land preparation

Plough the land about 25 cm depth. Hence Soil aeration and good drainage is facilitated.

Planting

However, vegetative growth is high in yala with good irrigation.

Spacing

1) In ridge and farrow system – 90 cm distance within farrow .keep 20 cm distance within plants.

2) In beds – Beds are prepared 6ocm width and keep 20 cm within plants.

Fertilizer

Add organic fertilizer. Apply inorganic fertilizer 2 weeks and 6 weeks after planting.

Inorganic fertilizer

Time of Application

Urea Kg/ha

TSP Kg/ha

MOP Kg/ha

Basal(2weeks after planting

60

120

120

Top Dressing(6 weeks after planting)

60

60

Water supply

At the crop initial growth stage water supply is important.

Excess water reduces tuber production

Weed Control

It is important to remove weeds at early stage of the crop, to reduce plant competition.

Pest Management

Crop rotation, on time harvesting and removing of debries.

Sweet potato weevil is the most harmful pest.

Disease Management

Diseases which affect to the yield of sweet potato have not been reported so far in Sri Lanka. Root rot diseases can be caused by rare soil-borne fungal species.

Causal organism: This is caused by Fusarium spp., which live in the soil.

Symptoms

  • Leaves turn to the Yellowing and then can see the wilting of vines and rotting of roots.

Management

  • Remove diseased plants from the field along with soil.

Harvesting

Recommended varieties can be harvested at 3 to 4 months .Maturity can be identified by secretions of from damaged place of vine. If tubers are immature latex production is high.

Yield

15-25 t/ha