基施氮肥用量对甘薯生长及产量的影响  

Effect of Nitrogen Applied as Basal Fertilizer on the Growth and Tuber Yield of Sweet Potato

作　　者：杨国才[1] 滕艳[1] 陈香颖[1] 杨庆飞[1] 唐道彬[1] 高旭[1] 黄庭荣 王季春[1] 

机构地区：[1]西南大学农学与生物科技学院重庆市甘薯工程技术研究中心,重庆400716 [2]重庆市酉阳县农业委员会,重庆酉阳409800

出　　处：《西南大学学报（自然科学版）》2015年第3期53-59,共7页Journal of Southwest University(Natural Science Edition)

基　　金：重庆市科委创新项目(CSTC2012ggB80007);国家自然科学基金(31101192);现代农业产业体系建设专项(CARS-11-C-20)

摘　　要：试验采用7个氮肥施用量结合不同磷钾肥用量处理,主要研究了不同氮肥用量对甘薯生长及产量的影响.结果表明：不同氮肥用量对甘薯的产量、茎蔓长、茎叶总鲜质量、茎叶干率、块根干率均具有显著影响;干物质含量与氮肥施用量呈显著的负相关性.施用氮肥和磷钾肥均能增加块根产量,以施氮135kg/hm2产量最高,但降低淀粉含量,氮用量超过180kg/hm2块根干率明显降低,90~135kg/hm2经济效益最好.In a field experiment, nitrogen at seven rates was applied to sweet potato in combination with P and K to study their effects on the growth and yield of the crop. The results showed that nitrogen at differ ent rates had a significant impact on tuber yield, vine length, shoot fresh weight, shoot dry matter content and tuber dry matter content, and that dry matter content was in a significant negative correlation with ni- trogen application rate. Application of nitrogen with phosphorus and potash increased tuber yield but re- duced starch content. The maximum tuber yield was obtained in the treatment of 135 kg N/hma. dry matter content was significantly lowered with a nitrogen application rate of 〉180 kg/hm2^. The conomie benefit was gained with a nitrogen application rate in the range of 90-135 kg/hm2^. Tuber best e-

关 键 词：甘薯 氮肥 生长势 产量 

分 类 号：S531[农业科学—作物学]