Developing yield survey methodologies is very difficult and time-consuming. When estimating yield, either before or after harvest, the current data should be compared with the relevant past data. In this way, we can examine and confirm the validity of the new data. Also, when we estimating final yield, coherency between the obtained total production of the crop and data concerning harvested area should be observed carefully. Estimating yield of fruits on a tree, too, is difficult.
Many fruit trees grow very tall.
It is almost impossible to count the fruits on such tall trees. Whether trees are young or old can greatly affect their productivity. In addition, different fruit trees have their own fruiting cycles. This factor must be considered when estimating yield of fruits. Training for local staff and field enumerators First, survey method manuals should be written.