A Czech agricultural student, Šimon Plánička, arrives at the small South Bohemian town of Hoštice, and joins the local JZD (agricultural co-op) with the intention of trying out his experiment regarding the "Milk yield of cows in regards to a cultured environment". He runs into difficulty with the directorship of the JZD, but he finds them eager to help once they hear he's the son of the local agricultural commissioner, as his last name is also Plánička. Blažena Škopková is given the task of finding out how things are looking. However everything is complicated by the jealousy of Blažena's boyfriend Venca.

A third and last part of an adventures of a villagers from the "Sun, Hay..." series.

For a second time this film leads us to the village in South Bohemia. We meet again Konopnik family and Skopek family. Venca Konopnik is marrying Blazena Skopek but there is another woman Milada who is very jealous and she is spreading gossips about Venca Konopnik. Those gossips are so powerful that they lead to big fights between Konopnik and Skopek families. You will also see what a progress on milk-yielding-cows-project has been made.