1. Components of System of Rice Intensification (SRI) |
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Young Seedling
(14 days old) |
Single Seedling/hill |
Square Planting |
Weeding by Cono Weeder |
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Alternate Wetting & Drying |
LCC based N Management |
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2. System of Rice Intensification (SRI) Cultivation |
2.1. Season |
- Dry season with assured irrigation is more suitable.
- Difficulty in crop establishment may be seen in areas with heavy downpour (NE Monsoon periods of Tamil Nadu)
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2.2. Varieties |
- Hybrids and varieties with heavy tillering
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3. Nursery |
3.1. Seed Rate |
- 7- 8 kg for single seedling per hill
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3.2. Preparation of Nursery Area |
Prepare 100 m2 nurseries to plant 1 ha. Select a levelled area near the water source. Spread a plastic sheet or used polythene gunny bags on the shallow raised bed to prevent roots growing deep into soil. |
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3.3.Preparation of Soil Mixture |
Four (4) m3 of soil mix is needed for each 100 m2 of nursery. Mix 70% soil + 20% well-decomposed pressmud / bio-gas slurry / FYM + 10% rice hull. Incorporate in the soil mixture 1.5 kg of powdered di -ammonium phosphate or 2 kg 17-17-17 NPK fertilizer.
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3.4. Blending Soil Mixture |
Filling in soil mixture: Place a wooden frame of 0.5 m long, 1 m wide and 4 cm deep divided into 4 equal segments on the plastic sheet or banana leaves. Fill the rame almost to the top with the soil mixture.
Pre-germinating the seeds 2 days before sowing: Soak the seeds for 24 h, drain and incubate the soaked seeds for 24 h, sow when the seeds sprout and radical (seed root) grows to 2-3 mm long.
Sowing: Sow the pre-germinated seeds weighing 90 -100 g / m-2 (100g dry seed may weigh 130g after sprouting) uniformly and cover them with dry soil to a hickness of 5mm. Sprinkle water immediately using rose can to soak the bed and remove the wooden frame and continue the process until the required area is completed. |
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3.5. Sowing Sprouted Seeds |
Watering: Water the nursery with rose can as and when needed
(twice or thrice a day) to keep the soil moist. Protect the nursery from heavy rains for the first 5 DAS. At 6 DAS, maintain thin film of water all around the seedling mats. Drain the water 2 days before removing the seedling mats for transplanting. |
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Spraying fertilizer solution (optional): If seedling growth is slow, sprinkle 0.5% urea + 0.5% zinc sulfate solution at 8-10 DAS. |
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Lifting seedling mats: Seedlings reach sufficient height for planting at 15 days. Lift the seedling mats and transport them to main field. |
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4. Main Field Preparation |
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5. Transplanting |
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Single seedling of 15 days old.
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Square planting of 25 x 25 cm.
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Fill up the gaps between 7th and 10th DAT.
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Transplant within 30 minutes of pulling out of seedlings.
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There may be difficulty in crop establishment in areas with heavy downpour (North East Monsoon periods of Tamil Nadu)
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6. Irrigation Management |
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Irrigation only to moist the soil in the early period of 10 days
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Restoring irrigation to a maximum depth of 2.5cm after development of hairline cracks in the soil until panicle initiation
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Increasing irrigation depth to 5.0cm after PI one day after disappearance of ponded water
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7. Weed Management |
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Using rotary weeder / Cono weeder
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Moving the weeder with forward and backward motion to bury the weeds and as well to aerate the soil at 7-10 days interval from 10-15 days after planting on either direction of the rows and column.
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Manual weeding is also essential to remove the weeds closer to rice root zone.
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8. Nutrient Managements |
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Nutrient Management through Leaf Color Chart (LCC) |
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Time of application is decided by LCC score
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Take observations from 14 DAT in transplanted rice or 21 DAS in direct seeded rice.
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Repeat the observations at weekly intervals up to heading
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Observe the leaf colour in the fully opened third leaf from the top as index leaf.
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Match the leaf color with the colours in the chart during morning hours (8-10 am).
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Take observation in 10 places.
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LCC critical value is 3.0 in low N response cultures like White Ponni and 4.0 in other cultivars and hybrids
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When 6/10 observations show less than the critical colour value, N can be applied @ 35kg N/ha in dry season and 30kg N/ha in wet season per application per ha.
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Green manure and farm yard manure application will enhance the growth and yield of rice in this system approach.
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Source: http://www.pustaka-deptan.go.id/rkb/knowledgeBank |