Tweak or even dissalow the power of Bone Meal
It is natural to use bone meal to accelerate crops in minecraft, but you may want to make them work better or worse.
FertilizerEfficiency: [Decimal value between 0.0 and 1.0]
Number by which the remaining time will be multiplied when a bone meal is used on the shrub.
A shrub has 100 seconds remaining to produce next fruit, and has 0.9 (10%) fertilizer efficiency:
A player uses bone meal once, reducing it to 90 seconds (-10s)
Immediately after, the player uses it again, reducing it to 81 seconds (-9s)
Immediately after, the player uses yet it again, reducing it to 72.9 seconds (-8s)
And so on, every time the player uses bone meal, the remaining time is multiplied by the fertilizer eficiency.
A higher number actually means that bone meal will have less and less effect, so that 1.0 disables this feature completely (the particles wont even be shown). In contrast, using a Fertilizer Efficiency of 0.0 makes it infinitely effective, one being enough to produce the next fruit always.
Perhaps I named it wrongly