Effects of Different Fertilization and Planting Density on the Photosynthetic Characteristics and Yield of Corn in the Midwest of Heilongjiang Province

[Objective] Effects of different fertilization and density on the photosynthetic characteristics and yield of corn in the Midwest of Heilongjiang Province was studied with the variety of Demeiya No.1 as material.[Method]Three levels of fertilizer and four levels of planting density were adopted.[Result] The results showed that photosynthetic characteristics and yield-related traits of corn could be regulated effectively by treatments of different fertilization and density.Appropriate supply of fertilizer(Pure N 150 kg/hm2,P2O590 kg/hm2,K2O 100 kg/hm2) could increase photosynthetic potential and total chlorophyll content,and ultimately increase the production of corn.In addition,compared to the other planting densities,photosynthetic rate of maize were all higher at the planting density of 90 000/hm2and achieve the better yield.[Conclusion]The relative yield of corn is the highest under the condition of corn planting density 90 000/hm2,fertility level pure N 150 kg/hm2,P2O590 kg/hm2,K2O 100 kg/hm2,which is uitable for corn planting in the Midwest cold regions of Heilongjiang Province currently.