Final answer:
The mood of Rukmani's family after the harvest is likely to be 'relieved', assuming a successful harvest and a time of hard work coming to fruition.
Step-by-step explanation:
The mood of Rukmani's family after the harvest can be best described as relieved. This can be inferred from the context of completing a period of hard labor and finally having the fruits of their effort ready, which typically brings a sense of relief.
However, it should be noted that without a specific textual reference from the novel 'Nectar in a Sieve' by Kamala Markandaya, which tells the story of Rukmani's life and struggles including those around harvest time, identifying the precise mood is based on understanding typical human reactions in such circumstances.
Levels of comfort and positive emotions increase with the duration of exposure to plants, according to one research review; the authors noted that purple and green plants were particularly effective at reducing negative feelings.