Adonai has the right to collect it by any means He deems fit. It must be paid on the fullness of our increase. In sorrow you shall eat of it all the days of your life. Thorns also and thistles shall it bring forth to you, and you shall eat the herb of the field. The ground is divinely cursed, for which reason there is normally famine and disease.
Food contamination brings every form of plague.
Any society with out enough good food is eventually destroyed. Therefore, G-d provided His covenant people with a way to overcome this curse, just as He has provided us with covering for sin. You must bring all the tithes into the storehouse, that there may be food in My house, and prove Me now with this, says YHVH of hosts, if I will not open to you the windows of heaven, and pour you out a blessing, that there shall not be room enough to receive it. And all nations shall call you blessed, because you shall be a delightful land, says YHVH of hosts. This is a prior condition placed on every person on earth.