Welcome, visitor! [ Register | Login

Overcoming Seed Dormancy for planting: Methods of Improving Germination

Uncategorized August 14, 2017

letstalkagric - seed dormancy

For every farmer when you have seeds that take too long to germinate, there are some methods of overcoming seed dormancy for planting. But you will first need to know what dormancy really mean before you take any step.

Seed dormancy is the inability of seeds to germinate under the required conditions for germination. It may be due to physical or physiological conditions of a viable seed. Seed dormancy affects crop establishment, growth and harvest and uniformity of seed development and maturation. The un-germinated dormant seed that remain in the soil will produce unwanted plants or volunteer plants in future.

In some crops, dormancy may be desirable when it prevents pre-harvest and post-harvest sprouting or germination during wet weather thereby maintaining seed quality or quality of planting material. Dormancy also protects the entire crop against total loss during drought.

Causes of seed dormancy

Certain factors may cause seed dormancy too and this could be due to;

Immature embryo. E.g. lettuce
Seed coat impermeable to water. E.g. okra, mungbean and amaranthus
Seed coat impermeable to gas. E.g. cucumber, lettuce and beets
Presence of germination inhibitors. E.g. phenolic compounds such as abscissic acid (ABA) and caffeic acid. These acids can be found in beets.
Physiological immaturity (absence of some growth substances or excess amount of inhibitors than promoters)
Light sensitivity
Mechanical restriction to seedling growth by seed coat. E.g. amaranthus and corchorus.
Examples of growth inhibitors include; cyanide, ammonia compounds, mustard oil, alkaloids (e.g. caffeic acid and cocaine), organic acids or compounds, unsaturated lactose, phenolic compounds, synthetic growth retarders and essential oils.

Overcoming seed dormancy

Use of suitable temperature regime:
Use the correct optimum temperature and alternating temperatures. E.g. 8hrs at 300C and 16hrs at 200C. Pre-chilling moist seeds at 5-80C.

Modification of seed coat:
It can be modified by cutting e.g. mango, milling to remove apparent appendages, scarification by abrasion or use of chemicals, e.g. acetone, alcohol, hydrogen peroxide, sulfuric acid, hydrochloric acid and sodium hydroxide. The use of chemicals requires that correct dosage per species is applied to avoid injury.

Removal or neutralization of growth inhibitors

Chemical treatment of the seed;
E.g. potassium nitrate, hydrogen peroxide, plant growth regulators (PGR) such as GA3 (Gibberellins), Auxins, cytokinins and ethylene.

 

Credit: Lets talk agric

No Tags

174 total views, 1 today

  

Leave a Reply

  • Overcoming Seed Dormancy for planting: Methods of Improving Germination

    by on August 14, 2017 - 0 Comments

    For every farmer when you have seeds that take too long to germinate, there are some methods of overcoming seed dormancy for planting. But you will first need to know what dormancy really mean before you take any step. Seed dormancy is the inability of seeds to germinate under the required conditions for germination. It […]

  • Learn Marcotting, It’s Quite Easy

    by on August 14, 2017 - 0 Comments

    Marcotting or air layering, an asexual or vegetative method of plant propagation, can be easily performed with less skill. Air layering is just slightly different from other methods of layering such as tip layering, simple layering, compound or serpentine layering, etc. In all these methods, the induction of root development is usually done by wounding the […]

  • Improving Breeds of Livestock

    by on August 4, 2017 - 0 Comments

    In animal farming, what every farmer need to know is to study the principles of inheritance of animals. That is if you want to improve breeds of livestock. This is concerned with how animals inherit features from their ancestors. In genetics, it tries to identify which features are inherited and work out the details of […]

  • How to Build Egg Incubator For Chickens

    by on August 4, 2017 - 0 Comments

    Have you thought about hatching chick in an egg incubator ?. It can be a fun project for yourself or to do with your kids. If you don’t already keep a flock, obtain some fertile eggs from a fellow chicken keeper or have fertile eggs shipped from a hatchery that offers a specific breed you’re […]