When diverse species are sown in the midst of a vineyard, what is the diameter of the circle of hallowing under standard conditions?
Halachah 1 establishes a radius of 16 cubits, making the full diameter 32 cubits. The 40-cubit circle (Halachah 2) applies only when the surrounding vine rows are within four cubits of the standard circle.
Question 2
A vine is embedded underground with soft earth above it. How much earth must cover it to permit sowing crops directly above?
Halachah 7 rules that three or more handbreadths of earth covering the buried vine permits sowing above it. Three fingerbreadths suffices only in hard, impermeable ground (Halachah 8).
Question 3
Someone sows crops next to a single vine (not a vineyard). What area around the vine becomes hallowed?
Halachah 3 specifies that a single vine hallos only a circle of six handbreadths radius in the sown area — this corresponds to the space needed to tend one vine, and is far smaller than the full vineyard circle.
Question 4
A person drapes a vine over some branches of a non-fruit-bearing tree, then sows under the un-draped branches. Later the vine spreads and covers the sown area. What must he do?
Halachah 13 rules that when a person sows under an un-draped portion of a trellis or non-fruit tree (which is prohibited), and the vine subsequently spreads there, he must uproot the crops — shifting the branches is not sufficient because the initial sowing was a violation.
Question 5
Three vines are extended underground with their bases visible, spaced five cubits apart. How are they treated?
Halachah 9 rules that three embedded vines with visible bases, spaced between four and eight cubits apart, combine with the surrounding vineyard and are treated as ordinary vines — the burial is irrelevant when the base is visible and spacing fits vineyard parameters.