Effects of Different Planting Densities on the Yield and Quality of Sweet Corn in the Nenjiang Area of Heilongjiang Province
This study used sweet corn varieties Cuiwang and Damigo as experimental materials,and four plant-ing densities were set up with 52 500 plants/ha(D1),60 000 plants/ha(CK),67 500 plants/ha(D2),and 75 000 plants/ha(D3).Meanwhile,the leaf area,photosynthetic rate,yield,crude protein content and reducing sugar content at dif-ferent growth stages were measured to explore suitable planting patterns.The results indicated that both individual leaf area and leaf area index(LAI)were influenced by planting density,variety,and their interactions.Leaf area per plant of Damigo significantly decreased at higher densities compared to Cuiwang.Population leaf area and net photo-synthetic rate(Pn)were notably affected by planting density but not by varieties.D3 reduced population leaf area by 9.47％and Pn declined with increasing density in Damigo compared to D2.The yield components were significantly influenced by both planting density and variety.Higher densities increased barren stalk rates and bare tip lengths in sweet corn,while reducing ear length,ear thickness,and 100-grain weight.The yield of sweet corn showed increas-ing first and then decreasing with increasing planting density,and D2 showed the highest yield.Meanwhile,the crude protein and reducing sugar content in two types of sweet corn also showed increasing first and then decreased with the increase of planting density.Therefore,the planting density of 67 500 plants/ha(D2)was found to be opti-mal for both Cuiwang and Damigoo in the Nenjiang area of Heilongjiang Province.
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