Storage of seed
The germination of seed is influenced by
– species
– quality at collection
– conditions between collection and storage
– conditions of storage
Proper storage of seeds is crucial to maintain their viability and germination rate over time. Temperature and humidity are the most important conditions for storing seed. Seeds should be kept in a cool, dry and dark environment to slow down the aging process.
A temperature range of 32°F to 41°F (0°C to 5°C) and 25-30 % relative humidity is ideal for most seeds.
Avoid temperature and humidity fluctuations. Fluctuating temperatures and humidity can harm seeds, so choose a storage location where the temperature remains relatively constant.
Exposure to light can also decrease seed viability. Store them in opaque containers or in a dark area to protect them from light.
There are two rules that are important for optimum seed storage:
Harrington’s Rule: Seed longevity decreases by 50 % for every
– 1% increase in moisture content within the seed
– every 10ºF (6ºC) increase in temperature.
James Rule (or rule of 100):
The total temperature in Fahrenheit and relative humidity (RH) should not be greater than 100.
For example: 43oF + 50 % RH = 93 and suitable storage conditions.
Important:
If a seed package is removed from a cold store and moved to a room with relatively high humidity, condensation will occur.
When seed packages are opened the risk of condensation forming on the seeds is harmful and the seed can become active. You cannot restore the seeds afterwards.
For unopened seed packages wait 24 hours before opening the package, to ensure the temperature is equal to room temperature to prevent condensation.
If an open seed package it returned to the storage room, leave the package for 24 hours to allow the moisture content of the seed to balance.
Please note:
Treated seeds, such as pelleted or primed seeds, cannot be stored for more than a few months and should be sown immediately.
