Taking KCI and K₂SO₄ produced in Russia,Luobupu K₂SO₄ produced in Xinjiang and K₂SO₄ produced in

Kaifeng as experimental materials,the experiment was carried out to study the effects of different K sources

and applying dosage on cabbage varieties of‘Redai’and‘Moyu’.The results showed:potassium application

could increase cabbage yield，the content of protein and VC,decrease the content of nitrate.When the amount

of K application was 300 kg·hm^-2,the effects of Luobupu K₂SO₄ was better than or close to the other K

sources.K₂SO₄ produced in Russia and K₂SO₄ produced in Kaifeng had the worst effect.Potassium application

increased‘Redai’output value by 29.9 %-33.2 %,and that of‘Moyu’by 15.8 %-20.5 %.Utilizing return

equation,it gained the best economical potassium application for‘Redai’was 354.0 kg·hm^-2,the highest

output value was 98 463.4 Yuan·hm^-2;that for‘Moyu’was 333.0 kg·hm^-2 and the highest output value was 98

201.2 Yuan·hm^-2.