Losses can occur at every stage from harvesting to storage.
Especially, losses can occur due to weather conditions. For instance: heavy storm rains at the time of monsoon rice harvest , coincide with start of moonson rain during summer rice harvest time.
Losses include -
(1) Quantitative Losses (reduction of rice yield)
(2) Qualitative Losses (poor seed quality, poor germination, high broken percent while milling, yellow rice, etc)