What it does

Poor seed quality leads to low vigor and poor growth. They are also prone to weeds, insects, and diseases.

Why and where it occurs

The problem arises as most farmers in Asia keep their own seed and do not tend to do any seed processing to ensure varietal purity or seed quality.

How to identify

The following are symptoms of poor quality seeds:

• low germination, mixed varieties, low plant vigor, diseased plants or the introduction of weeds
• Seed source may be discolored
• Seeds may be of different sizes and varieties
• Seed sources may contain inert, weeds or other matter

The pattern of damage is usually general across the field.

Various problems causing problems of crop establishment (e.g., cloddy soil, seed too deep, soil too soft at seeding, poor emergence in low spots in fields, heavy rainfall at seeding, soil crusting, poor seed distribution, low seed rate, water stress, muddy water at seeding, clogged seeder and/or pests such as ants, birds and rats that remove seed at planting.

To confirm the cause of problem, check or ask farmer about seed source and quality. It may be necessary to check germination, thousand-grain weight, seed purity and the extent of non-seed materials (e.g., inert matter or weeds).

How to manage

• Use good quality seeds (high viability, high germination rates, varietal purity and seed should be full i.e., high thousand grain weight for the variety and free of insects, diseases and weed seeds)
• Perform seed processing to ensure varietal purity or seed quality

Learn more

View full fact sheet:
Poor seed quality on IRRI Rice Knowledge Bank