What is the primary reason for differences in performance of the same mango variety within a single orchard when the rootstocks are grown from seeds?

Explanation

The variation in performance is mainly attributed to polyembryony in the rootstocks. Polyembryonic seeds produce multiple embryos, leading to genetic uniformity in some seedlings and variability in others, which affects the growth and yield consistency. Other factors like rootstock size and monoembryony also influence performance but polyembryony is the key reason.