种植密度对夏玉米主要农艺性状和产量产值的影响OA

In order to explore the suitable planting densities for summer sowing corn Cangnong 199 and Zhengdan 958 in Cangzhou,a field experiment was carried out in Cangzhou from 2021 to 2022,setting 3 density treatments of 60 000,67 500 and 75 000 plants/hm2 to compare and analyze the agronomic traits,yields and output values of the two varieties under di-fferent density treatments.The results showed that,Cangnong 199 was 9.0 days earlier than Zhengdan 958,and its accumu-lated temperature requirement was relatively low.It can fully mature in the late stage of two-crop wheat-corn planting in Cangzhou area.Zhengdan 958 has the highest yield and output value under a planting density of 60 000 plants/hm2,and its suitable planting density for field production is 60 000-67 500 plants/hm2.Cangnong 199 had high yield and output value under densities of 67 500 to 75 000 plants/hm2,and its output value under three planting density treatments was higher than that of Zhengdan 958.Comprehensive analysis shows that Cangnong 199 has excellent characte-ristics such as early maturity,high yield,and machine harvesting,and is suitable for large-scale promotion in Cangzhou ecological type areas.Its suitable planting density is 67 500 to 75 000 plants/hm2.