If I planted new additional shade trees last year, should I enter 0 for the size last year?
Create a new entry for the new trees planted. Indicate 0 for density last year, and under size last year indicate the diameter of the new trees at the time they were planted. For size this year enter the measured diameter this year, as well as the number of trees planted. If you also have older additional trees you grew since starting your crop lifecycle, make a separate entry for them with their increase in diameter.