I am a student working on developing a machine to pick fruits. I need some information regarding the same for Citrus and Sapota fruits. I could not find any contact on Internet so had to take the recourse of this forum. Can any one provide me information about Citrus fruits and/or Sapota for the questions like In one acre how many trees are there and what is the average production from one acre area in one harvest season, How many harvest seasons are there for each fruit, How many labours are employed during harvesting for picking and what is the average labour wage. Any/all suggestions are welcome. I would be thankful if some one can provide me useful references too.