Chemical Weathering. Chemical weathering takes place in almost all types of rocks. Smaller rocks are more susceptible, however, because they have a greater amount of surface area. Chemical reactions break down the bonds holding the rocks together, causing them to fall apart, forming smaller and smaller pieces.
Autos generally are ready to harvest sooner than photoperiod. Most autos are ready to harvest 65-90 days after being sprouted from seed. Some super autos have been bred to grow very big and can take up to 100 days before harvest.
Since pods ripen at different stages, farmers must carefully examine each one to determine if it is ready for harvesting. Farmers typically begin to harvest opium about two weeks after the petals have fallen. While still on the stem, the farmer makes vertical incisions on two or three sides of the pod.