Seed Selection and Stratification

You will identify size grading thresholds that correlate directly with embryo vigor in Prunus rootstocks. Master mechanical separation methods to discard hollow pits before allocating nursery bed space.

You will calculate required chill hours and moisture levels for Malus and Pyrus wild selections. Maintain clean conditions throughout long chilling periods to prevent early fungus formation.

You will execute cut tests and embryo evaluations to estimate actual germination capacity before stratifying seeds. Calculate accurate seeding rates from viable embryo percentages.