System of Rice Intensification (SRI)
About SRI technique :
- The System of Rice Intensification(SRI) is a farming methodology aimed at increasing the yield of rice produced in farming.
- It is a low-water, labor-intensive method that uses younger seedlings singly spaced and typically hand weeded with special tools.
- The System of Rice Intensification involves cultivating rice with as much organic manure as possible, starting with young seedlings planted singly at wider spacing in a square pattern.
- It involves intermittent irrigation that keeps the soil moist but not inundated, and frequent inter cultivation with weeder that actively aerates the soil.
- SRI is not a standardised, fixed technological method.
- It is rather a set of ideas, a methodology for comprehensively managing and conserving resources by changing the way that land, seeds, water, nutrients, and human labour are used to increase productivity from a small but well-tended number of seeds.
A comparison of SRI and conventional method of rice cultivation is as follows :
|Spacing||15×10 cm||25×25 cm|
|No of plants per sq.m||66||16|
|No. of seedlings per hill||3||1|
|No. of plants per acre||792000||64000|
|Seed requirement per acre||20 kg||2 kg|
SRI is initially labour intensive :
- Needs 50% more man-days for transplanting and weeding.
- Mobilises labour to work for profit.
- It offers an alternative to the resource poor, who put in their family labour.
- Once the right skills are learnt and implemented, the labour costs will be lesser.
SRI encourages rice plant to grow healthy with :
- Large root volume
- Profuse and strong tillers – Maximum tillering (30 tillers/plant can be easily achieved; 50 tillers per plant are quite attainable) occurs concurrently with panicle initiation.
- Under excellent management even 100 fertile tillers per plant or even more can be achieved due to early transplanting and absence of die back of roots.
- Non lodging
- Big panicles
- More and well filled grain panicles and higher grain weight
- Resists insects because it allows rice to absorb soil nutrients naturally
Syllabus : Prelims + Mains; GS3 – Agriculture