Long-term nitrogen-phosphorus and organic fertilizer combined application positioning experiment in cinnamon soil area: a dataset of corn yield traits from 1992 to 2021

The long-term positioning experiment on combined application of nitrogen, phosphorus, and organic manure in the Cinnamon soil region followed an orthogonal design with three factors (N, P, and organic manure) at four levels each. Additionally, an unfertilized control (CK) and a high-rate organic manure-only treatment (N0P0M6) were included, resulting in a total of 18 fertilization treatments. This dataset records monitored data including maize yield, sowing date, maturity date, maize cultivar, sowing method, field management practices, and fertilizer application rates, covering the period from 1992 to 2021.