摘要
为明确减量施氮对甘蔗产量、氮肥利用率、氮磷钾含量、含糖量及土壤呼吸的影响,为广西蔗区氮肥优化管理提供理论支撑。本研究在广西典型蔗区开展田间定位试验,设置4个施氮水平梯度处理,分别为常规施氮量500 kg/hm^(2)(N500),减量20%施氮(N400)、减量40%施氮(N300)和不施氮肥处理(N0)。2019~2021年连续3个甘蔗生长季的观测结果表明,减量施氮未显著影响甘蔗产量、茎部氮磷钾含量、含糖量及土壤呼吸速率,但是显著提高了氮肥偏生产力。与常规施氮(500 kg/hm^(2))相比,减量40%处理(N300)的氮肥偏生产力提高了105.40 kg/kg。综上,优化施氮量可在维持甘蔗高产的同时显著提升氮肥利用效率,降低环境污染风险。
Elucidating the effects of nitrogen(N)fertilizer reduction on sugarcane yield,nitrogen use efficiency,nitrogen,phosphorus(P),and potassium(K)content,sugar content,and soil respiration could provide a theoretical basis for optimizing nitrogen fertilizer management in sugarcane fields in Guangxi.A field experiment was conducted in a typical sugarcane-growing region of Guangxi to evaluate four N application rates:a conventional rate of 500 kg/hm^(2)(N500),and reduced rate of 20%(N400),40%(N300),and a zero-N control(N0).Over three consecutive growing seasons(2019~2021),the observation results showed that N reduction up to 40%did not significantly affect sugarcane yield,stalk N,P,K content,sugar content,or soil respiration rate.However,it significantly increased the partial factor productivity of applied N(PFPN).Compared with conventional N application rate(500 kg/hm^(2)),the PFPN increased by 105.40 kg/kg under N300.These findings demonstrate that optimizing N application rate can significantly enhance nitrogen use efficiency without compromising sugarcane yield,offering a strategy for sustainable sugarcane production with lower environmental risks.
作者
陆艳妮
李卓亭
徐强胜
宁文婷
詹双庆
苏宏新
胡宝清
LU Yanni;LI Zhuoting;XU Qiangsheng;NING Wenting;ZHAN Shuangqing;SU Hongxin;HU Baoqing(Key Laboratory of Environment Change and Resources Use in Beibu Gulf,Ministry of Education,Nanning Normal University,Nanning 530001,Guangxi,China;Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation,Nanning Normal University,Nanning 530001,Guangxi,China;School of Geography and Planning,Nanning Normal University,Nanning 530001,Guangxi,China)
出处
《甘蔗糖业》
2025年第6期26-35,共10页
Sugarcane and Canesugar
基金
广西自然科学基金项目(2025GXNSFAA069581、2018GXNSFBA281177)
广西高校引进海外高层次人才“百人计划”(6020303891350)。
关键词
甘蔗
氮肥
产量
肥料利用率
养分吸收量
土壤呼吸
Sugarcane
Nitrogen fertilizer
Yield
Fertilizer utilization rate efficiency
Nutrient uptake
Soil respiration
