If a se'ah of wheat accidentally mixes into 23 se'ah of barley, what must the farmer do before sowing?
Halachah 1 states that when the minority species reaches 1/24 of the mixture (one se'ah in 24), the farmer must either remove some of the forbidden species or add more of the majority species before sowing — otherwise he is liable for lashes.
Question 2
A farmer intentionally mixes two species of seed. What is the minimum quantity that is forbidden to sow?
Halachah 6 teaches that when mixing was intentional, there is no minimum threshold — it is forbidden to sow even one kernel of wheat with an entire grainheap of barley. The 1/24 leniency applies only to unintentional admixtures.
Question 3
Indigo grows on its own in a wheat field, covering more than 1/24 of the area. Must the farmer uproot it?
Halachot 8–9 teach that when circumstances make the farmer's innocent intent obvious — as when the intermingled species damages the primary crop, like indigo in wheat — we do not require him to reduce it, since there is no reasonable suspicion that he sowed it deliberately.
Question 4
A farmer sowed wheat, then changed his mind and wants to sow barley in the same field before the wheat sprouted. What steps are required?
Halachah 13 requires two steps: wait three days (in a well-irrigated field) until the wheat seeds rot and decompose, then plow the field as one would before rainfall — after both steps, the barley may be sown. The Ra'avad disagreed, but the Rambam requires both waiting and plowing.
Question 5
What did the Rabbis institute when field owners grew lax because court agents were cleaning their fields for them?
Halachah 16 records that when owners were happy to let agents clean their fields — and thus neglected the mitzvah themselves — the courts instituted that any field containing a second species of 1/24 or more would be declared ownerless, creating a strong disincentive for complacency.