热带作物学报2025，Vol.46Issue(3)：688-694,7.DOI:10.3969/j.issn.1000-2561.2025.03.016
不同缓控释氮肥对甘薯生长、氮素吸收及利用的影响
Effects of Different Slow-releasing Nitrogen Fertilizers on Growth,Nitrogen Absorption and Nitrogen Use Efficiency of Sweet Potato
摘要
Abstract
Sweet potato is often base fertilized with nitrogen and no further dressing nitrogen fertilizer is needed.It is important to develop and screen slow-releasing nitrogen fertilizers that could meet the nitrogen requirements of sweet potato at different growth stages in order to promote yield and reduce nitrogen rate.A greenhouse pot experiment using variety Sushu 16 was conducted to analyze the effects of different slow-releasing nitrogen fertilizers(urea formaldehyde,sulfur-coated urea,urea formaldehyde resin,urea combined with nitrification inhibitors)on leaf photosynthesis,above-ground and underground biomass and nitrogen content,nitrogen use efficiency,and soil mineral nitrogen(nitrate nitro-gen and ammonium nitrogen)content at different growth stages of sweet potato(seedling stage,vine burying stage,bulking stage,and harvest stage).Compared with the control,the sulfur-coated urea and oxamide controlled-release nitrogen fertilizers increased the biomass of sweet potato roots by 96.79%and 103.59%,respectively,significantly higher than that of the urea-formaldehyde and urea combined with nitrification inhibitor treatments(P<0.05).In addi-tion,the photosynthesis rate of sweet potato throughout the entire growth period was significantly higher in the sul-fur-coated urea treatment than that of unfertilized control,which is beneficial to improving the biomass of sweet potato roots.The nitrogen releasing of sulfur-coated urea and oxamide was less in the seedling and closure period and more in the swelling period and harvest period.The sum of ammonium nitrogen and nitrate nitrogen was 1.24-1.60 times that of urea-formaldehyde and urea combined with nitrification inhibitor,and the nitrogen fertilizer utilization rate increased by 1.17-1.80 times.In conclusion,sulfur-coated urea and urea formaldehyde are more suitable for the one-time application of nitrogen fertilizer in sweet potato production.The study results could provide scientific basis for nutrient manage-ment and nitrogen fertilizer reduction and yield enhancement in sweet potato production.关键词
缓控释氮肥/甘薯/光合速率/矿质氮/氮肥利用率Key words
slow-releasing nitrogen fertilizer/sweet potato/photosynthetic rate/mineral nitrogen/nitrogen use effi-ciency分类
农业科技引用本文复制引用
许泽康,石琨,欧阳宇珺,吴建燕,马洪波,张小贝,汪吉东..不同缓控释氮肥对甘薯生长、氮素吸收及利用的影响[J].热带作物学报,2025,46(3):688-694,7.基金项目
海南省重点研发计划项目(No.ZDYF2020226) （No.ZDYF2020226）
财政部农业农村部国家现代农业产业技术体系项目(No.CARS-10-GW10,No.CARS-10-GW2). （No.CARS-10-GW10,No.CARS-10-GW2）
