AN OUTLINE OF TREE SEED BIOLOGY
Robbins, AMJ (2004)
Abstract: This technical note provides an outline of the biological principles behind the various practices of tree seed handling, so that they may be carried out with a better understanding of why they are done. It is not intended to be a detailed treatise (for which there are many good texts available), but rather a means by which forest officers can refresh their memories as to the principles, and provide a framework within which they can expand their knowledge, when necessary.
GUIDELINES FOR SEED COLLECTION
Robbins, AMJ (2004)
this manual has been written for District Forest Controllers and their staff, with the aim of ensuring
that proper seed handling practices are used in each forest district.
SEED PROCESSING AND TREATMENT
Robbins, AMJ (2004)
This leaflet explains how seed should be handled after collection and before storage or sowing in the Seed processing, and treatment covers such activities as: after-ripening of the seed; removal of unwanted seed parts; separation of empty seed; cleaning; preparation for storage; treatment against pests; treatment to improve germination.
BASIC RULES FOR SEED STORAGE
Robbins, AMJ (2004)
There are two main methods of storage, determined by the class of seed that has to be stored. Most species have seeds that store best when dry ('orthodox' seed), but some species have seed that will lose viability if dried and must therefore be kept moist during storage ('recalcitrant' seed).
SIMPLE GERMINATION TESTING
Robbins, AMJ (2004)
A lot of time, effort and seeds can be wasted in the nursery if seeds are sown without knowing how many are viable and have the potential of producing a seedling. A guess can be made from past experience, but collection, processing and storage methods can cause large differences between seed lots.
It is therefore important to test each seed lot for viability after collection, and also before sowing if some period of storage has been needed.