Context: As is known from the "Sumerian Farmer's Almanac", after the flood season and after the Spring Equinox and the Akitu or New Year Festival, using the canals, farmers would flood their fields and then drain the water. Next they made oxen stomp the ground and kill weeds. They then dragged the fields with pickaxes. After drying, they plowed, harrowed, and raked the ground three times, and pulverized it with a mattock, before planting seed. Unfortunately the high evaporation rate resulted in a gradual increase in the salinity of the fields. By the Ur III period, farmers had switched from wheat to the more salt-tolerant barley as their principal crop.

Question: How do archaeologists know about Sumerian agricultural practices? 
Answer: from the "Sumerian Farmer's Almanac"

Question: When would farmers flood their fields?
Answer: after the Spring Equinox and the Akitu

Question: Why did the Sumerian farmers make their oxen stomp the ground?
Answer: kill weeds

Question: How many times did Sumerian farmers plow, harrow and rake the ground?
Answer: three times

Question: The the Ur III period, what crop had Sumerians switched to from wheat for their primary crop?
Answer: salt-tolerant barley

Question: What people first wrote an Almanac?
Answer: Unanswerable

Question: What was the name of the first Almanac?
Answer: Unanswerable

Question: What did farmers flood just before the new year?
Answer: Unanswerable

Question: When did farmers switch from barley to wheat?
Answer: Unanswerable