For the source text click/tap here: Bava Metzia 106
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According to the last Mishna on our daf, if the agreement was to plant barley he cannot plant wheat, but if the agreement was to plant wheat, he would be allowed to plant barley. Similarly, if the agreement was to plant grain, he cannot plant legumes (kitnit), but if they had agreed that he would plant kitnit, he can choose to plant grain. In both of these cases Rabban Shimon ben Gamliel disagrees, ruling that no change can be made.
The Gemora records an incident: A man leased a field to grow aspasta for kors of barley (which he would buy and pay the landowner with). The field produced a crop of aspasta, and he plowed and replanted it with barley (instead of aspasta), which grew stunted.
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