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在大田栽培条件下,研究了减量施氮对广州地区不同甘蔗/大豆间作模式下甘蔗产量、品质、生物量动态变化及甘蔗群体经济效益的影响.结果表明:氮肥和种植模式对甘蔗产量、品质均无显著影响,各处理甘蔗产量、品质均无显著差异.不同施氮水平的甘蔗/大豆间作系统较单作甘蔗提高了土地利用率,其土地当量比(LER)为1.36～2.12.各处理甘蔗总生物量的动态积累随生育期的推进均符合“S”型生长曲线,低氮水平下间作甘蔗的生物量动态积累特征参数最协调,高氮水平下,甘蔗生长高峰期提前,快速生长最大持续期缩短,甘蔗产量下降,因此,可以通过调整氮素的投入量来改善生物量的增长参数,从而获得高产.低氮处理甘蔗/大豆间作系统经济效益比高氮处理高3.2%～26.3%,说明减量施氮可有效提高群体经济效益.甘蔗/大豆1∶2间作模式的经济效益最好.
The effects of nitrogen application rate on sugar cane yield, quality, biomass dynamics and economic benefits of sugar cane population in different sugarcane / soybean intercropping systems in Guangzhou area were studied under field cultivation conditions.The results showed that nitrogen fertilizer and planting mode had significant influence on the yield, There was no significant difference in the quality and yield of sugarcane among different treatments, and the land use efficiency of sugarcane / soybean intercropping system with different N application rates was higher than that of single sugarcane with LER 1.36-2.12. The dynamic accumulation of total biomass of sugarcane was consistent with the growth pattern of “S” during the growth period. The dynamic biomass accumulation characteristics of sugarcane were the most consistent among low nitrogen level. The highest growth rate of sugarcane was under the high nitrogen level , The shortest period of rapid growth was shortened and the output of sugarcane was decreased, therefore, the growth parameters of biomass could be improved by adjusting the amount of nitrogen input, and the high yield could be obtained.The economic benefits of low nitrogen treatment of sugarcane / soybean intercropping system was 3.2 % ~ 26.3%, indicating that reducing nitrogen application can effectively improve the economic efficiency of the population.The sugarcane / soybean 1: 2 intercropping mode has the best economic benefit.