Land Requirement

Land should be free of volunteer plants. The previous crop should not be the other varieties of the same crop. It can be the same variety, if it is certified as per the procedures of certification agency.

Field Standards

A. General Requirements

Isolation

• Rice seed production fields shall be isolated from the contaminants by allowing the isolation distance as specified below.

B. Specific requirements

• In dormant cultivars, break the seed dormancy by soaking the seeds in equal volume of 0.1 N conc. HNO₃ or 0.5 % KNO₃ for 12 - 16 h.
• Upgrade the seeds by specific gravity grading method with salt solution by dissolving 1.5 kg of common salt in 10 lit of water. Remove the floaters, and use the sinkers for sowing after repeated washing with water.
• For rainfed or direct sowing, harden the seeds by soaking in equal volume of 1% KCl solution for 16 h, and dry back the seeds to original moisture content.
• For sowing in saline / sodic soils, soak the seeds in equal volume of 80 micro molar of sodium nitroprusside for 16 h.

• SRI method can be adopted.

• Incorporation of green manure like daincha in soil.
• Shallow planting at 3 - 4 seedlings / hill.
• Basal application of gypsum @ 500 kg / ha.
• Foliar spray with 0.5 % FeSO ₄ and ZnSO₄ at tillering stage.

1. Short duration        : NPK @ 120:40:40 kg / ha
2. Medium duration    : NPK @ 150:50:60 kg / ha
3. Long duration        : NPK @ 150:50:80 kg / ha
   

• Apply ZnSO₄ @ 25 kg / ha.

• Leave a roguing space of 30 cm for every 150 cm.


                                                                   
Roguing space in rice seed crop                                                                                                            Roguing

• A minimum of two inspections shall be made from the time the crop approaches flowering until it is ready for harvesting.

• Foliar spray of 2 % DAP at boot leaf stage and at 5 - 10% flowering.

• When 90% of the panicle are in straw colour with the moisture content of 20% for short and medium duration varieties and 17% moisture for long duration varieties

Threshing

• Threshing at 16-17% moisture content either manually or using mechanical threshers for seed separation

Drying

• Dry the seeds to 12-13% moisture content for short term storage and 8-9% moisture for long term storage

Grading

• For getting better seed quality, size grade the seeds using 1.3 mm x 19 mm oblong sieve.
• Size graded seeds may be upgraded by density grading using specific gravity separator.
• Heavy and medium fractions with 90 - 92% recovery are selected for seed purpose.

• Treat the seeds with carbendazim @ 2 g / kg of seed.
• Treat the seeds with halogen mixture @ 3 g / kg (CaOCl₂ + CaCO₃+ arappu (Albizzia amara) leaf powder mixed in the ratio of 5:4:1) as eco-friendly treatment.

Storage

• Store the seeds in gunny or cloth bags for short term storage (8 - 9 months) with a seed moisture content of 12 - 13 %.
• Store the seeds in polylined gunny bag for medium term storage (12 - 15 months) with a seed moisture content of 8 - 9 %.
• Store the seeds in 700 gauge polythene bag for long term storage (more than 15 months) with a seed moisture content of less than 8 %.

Seed Standards