1. Components of System of Rice Intensification (SRI)  | 
                
                
                  
                    
                      
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                        Young Seedling
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                            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  |