陇东南部林缘山区青贮玉米品种筛选及其高效栽培研究OA北大核心

The aims of this study were to screen cultivars of silage maize(Zea mays)to identify those suitable for cultivation in forest-margin mountainous areas of southeast Gansu,and to determine the most appropriate cultivation methods.A field experiment was conducted with five varieties of silage maize,and their yields and nutrient contents were determined.A grey correlation analysis was conducted to rank the five varieties from most to least suitable on the basis of their attributes.Overall,the variety Tie Yan 53 performed the best,and could serve as the main variety for cultivation in southeast Gansu.The impact of different nitrogen application rates(0,70,140,210,and 280 kg N·ha-1)and different planting densities(60000,67500,75000,82500 and 90000 plants·ha-1)on the yields and quality of Tie Yan 53 was determined.The results showed that the maximum yield of Tie Yan 53(38.80 t·ha-1)was obtained with 210 kg N·ha-1.Increasing the N application rate to 280 kg N·ha-1 did not increase the yield,but resulted in the best nutrient status.The yield of Tie Yan 53 increased with increasing planting density,with the maximum yield achieved at 90000 plants·ha-1.The crude protein content was highest at a planting density of 75000 plants·ha-1,and the crude protein yield was highest at a planting density of 90000 plants·ha-1.Considering the balance between N application,yield,and economic benefits,280.74 kg N·ha-1 is recommended as the appropriate N application rate for Tie Yan 53 in this area.To achieve the best yield and quality,the recommended planting density is 90000 plants·ha-1.