Lets compare vitamin content per 100 grams of Oranges vs Buckwheat:
Raw Oranges have more Vitamin A and more Vitamin C than Buckwheat.
While Buckwheat contains 10.6 times more Vitamin B2, 24.9 times more Vitamin B3, 4.9 times more Vitamin B5 and 3.5 times more Vitamin B6 than Raw Oranges.
Both Raw Oranges and Buckwheat have similar amounts of Vitamin B1 and Vitamin B9 per 100 g.
Both Raw Oranges as well as Buckwheat have insufficient amounts of Vitamin B12 and Vitamin D in 100 g.
Comparing minerals per 100 grams for Oranges vs Buckwheat:
Raw Oranges have 2.2 times more Calcium and 8.9 times more Water than Buckwheat.
While Buckwheat contains 24.4 times more Copper, 22 times more Iron, 23.1 times more Magnesium, 52 times more Manganese, 24.8 times more Phosphorus, 2.5 times more Potassium, 16.6 times more Selenium and 34.3 times more Zinc than Raw Oranges.
Comparison of macro-nutrients per 100 grams:
Buckwheat contains 7.3 times more Energy, 28.3 times more Fat, 49.4 times more Saturated Fat, 11.1 times more Omega 3, 53.4 times more Omega 6, 6.1 times more Carbohydrate, 4.2 times more Fiber and 14.1 times more Protein than Raw Oranges.
Both Raw Oranges as well as Buckwheat have insufficient amounts of Cholesterol, Glucose and Sucrose in 100 g.