Men were used for such work only when accumulated crops required extra help.

Both crops required three to five years of growth before substantial harvests could be conducted.

These crops required some cool weather during the year, and the orchards were almost entirely in mountainous areas.

These new crops require vast amounts of space for maximum yield.

Commercial sesame crops require 90 to 120 frost free days.

Onions are easily harvested by machine, while the other crops require more manual labor.

The crop requires a relatively dry season during its growing period.

Both crops require moderate temperatures and average rainfall in this period.

Many crops required ploughing up to three times in a season to prepare the fields for planting.