nice forum! It would be nice if we had a guide describing how many XP points you need to complete 1 level. I didn't really keep track, but I'd suggest everybody lists it for the level they are currently playing. It's not that difficult: Before harvesting some crops, write down: current percentage of completion and XP per crop. Then, monitor how many crops are needed to add 1%. for example: I was in level 18. I had 44%, and was about to harvest corn (155 xp each).
% - #corn 44 - 0 45 - 2 46 - 5 47 - 4 48 - 5
How to analyze this? First, the fact i only needed 2 corns to go from 44-45 is not relevant. You have to look at the number of corn needed after the 1st added %. You will notice it alternates between 5 and 4 number of corns. This corresponds to 775 and 620 XP. My educated guess is now that you need 750XP to add 1%.
Hence: level - XP/% - XP/level 18 - 750 - 75000
Hope this helps, and I'll add more when I'm in 19. Please help if you are in another level.