Objective  Effects of planting season and location on the flavonoids and B vitamins contents in the purple black rice Ziliangyou 737 were studied.

  Method  Contents of anthocyanins, flavonoids, carotenoids, and B vitamins of the rice specimens collected from 12 localities in Fujian in mid-April to mid-October 2021 were determined and statistically analyzed for principal components.

  Result  The contents of anthocyanins, flavonoids, and carotenoids in grains were significantly higher in the rice planted in the late or post-tobacco season than in the early or middle season. The contents also increased with increasing altitude of the area where the rice was cultivated. On the other hand, vitamins were more abundantly found in the rice planted in the early or late season than in the middle or post-tobacco season, but not significantly affected by elevation. VB₆, VB₄, VB₅, anthocyanin, flavonoid, and carotenoids represented a greater load as the first principal components and were the major nutrients in the rice. The 2^nd principal components included VB₃, VB₈, and VB₇, while the 3^rd principal components, VB₁ and VB₂. Overall, the rice planted in the late season from Lanting, Ningde received the highest score among all, while the mid-season rice tended to be low.

  Conclusion   On B vitamins, Ziliangyou 737 contained more VB₅, VB₁, and VB₆ than the others. The rice planted in late season or in areas of high altitude with sufficient sunlight and low temperature appeared to have higher contents of anthocyanin, flavonoids, carotenoids, and B vitamins.