Effects of Rational Ratio of Magnesium and Potassium on Yield of Rice(Oryza sativa L.) in Cold Region

[Objective] The purpose was to study the effects of rational ratio of magnesium and potassium on yield of rice in cold region,to confirm suitable ration of magnesium and potassium.[Method] Kongyu 131 was used as the material in this test to research the effect of magnesium fertilizer and potassium fertilizer on rice yield and quality,and prove up the rational ratio of magnesium fertilizer and potassium fertilizer by the randomized block design.[Result] In high,middle and low application potassium fertilizer region,fertilizer application of MgSO4·7H2O∶K2O 1∶1(magnesium fertilizer 100.5 kg/hm2,potassium fertilizer 165.0 kg/hm2) or 1∶2(magnesium fertilizer 100.5 kg/hm2,potassium fertilizer 276.0 kg/hm2) reasonably increased nitrogen content of rice leaf at critical growth periods;fertilizer application of MgSO4·7H2O∶K2O 1∶2(magnesium fertilizer 100.5 kg/hm2,potassium fertilizer 276.0 kg/hm2) kept population leaf area index toward reasonable,against premature senility or remaining green;fertilizer application of MgSO4·7H2O∶K2O 2∶1(magnesium fertilizer 201.0 kg/hm2,potassium fertilizer 165.0 kg/hm2) promoted yield by increasing ear number and seed setting rate,and yield reached 9 660 kg/hm2.[Conclusion] The study has a far-researching significance for keeping soil nutrition balance,then increasing rice yield and modifying rice quality to promote rice industrial sustainable development.