殖
ショク, ふ.える, ふ.やす, うえ, え, げ

augment, increase, multiply, raise

JLPT1 G7 S12 F1362

直 here an abbreviated form# of 植 plant (v.) + a now-obsolete element of uncertain significance that came to be written 歹 → *breed*; *increase*; *multiply*.

[Full Kanji Etymology List]