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Rice-the staple food-Crop Establishment
Different Methods for Direct Sowing (Seed Broadcasting)
Wet Seeding
How do we perform wet seeding?
- Pre-germinated seeds are used as the planting material.
- Seeds are broadcasted in to the field.
- Randomly OR
- In rows (manually or using mechanical seeders).
- Seed rate – ~400 seeds/sq m.
- After sowing, field is intermittently wetted to avoid seed desiccation.
- After 01 week (5 cm tall seedlings), water is impounded to the field (about 2cm height) .
Important factors to be considered?
- Stand establishment may be affected by various factors and result variable seedling densities in the field, such as,
- quality and vigor of seeds
- quality of land preparation
- weed competition
- water management
- environmental conditions (e.g. rainfall during the initial period after sowing)
- physical damages
- Use of seed paddy with a good seed vigor may help overcoming these issues.
- Row seeding will assit
- mechanical control of weeds.
- better crop management.
- optimum seedling density in the field.
- However, row seeding is practiced in limited scale because of the cost and the difficulty in obtaining implements.
Dry Seding
How do we perform dry seeding?
- Non-germinated (dry) seeds are used as planting material.
- Field is usually at a state of “no-water”.
- Seeds are sawn on to dry soil (Also known as “Kekulan” or “Manawari” method).
- Sowing is done either in rows or in a random manner.
- Required seed rates vary with
- severity of the environmental conditions.
- potential physical damages to the seeds.
- Seed rates could also be adjusted to control weed infestation levels (from 150 kg/ha to 300 kg/ha).
Water Seeding
Water seeding is a novel, recently introduced method of establishment.
How do we perform water seeding?
- Pre-germinated seeds are used as the planting material.
- soaked for 48 hours and incubated for 24 hours.
- Seeds are broadcasted to puddled soil with standing water unlike in wet seeding.
- water may contain suspended clay particles.
- seeds slowly get deposited with a thin layer of mud.
Advantages
- Protect the sown seeds from birds.
- Minimize the growth of weeds including grasses and sedges.