Everyone now karma law is what you sow is what you reap. so if you sow corn then you will get corn, and if you sow mango then you will get mango. So if we sow 1 corn then we get 1 corn, and if we sow 1 mango then you will get 1 mango. But that is wrong because when you sow a corn then you will get a corn plant and it will give you many corn not just a corn. So be careful with what you sow it is good if it is just a corn because a corn will die in one-time harvest, but if it is a mango then it will harvest many time in many years.
Source: dhamma sermon