摘要
为研究莴苣高产、优质、低污染、高氮肥利用率的合理氮肥施用量,采用盆栽试验与15N标记示踪技术,分析了氮肥施用量与莴苣产量和品质及氮肥利用率的关系.根据试验结果,将每1kg土的氮肥施用量x(g)与每盆莴苣的产量y(g)拟合成回归方程为y=104.21+2476.31x-5181.97x2,表明莴苣产量随氮肥施用量的增加呈先增加后下降的变化趋势.每1kg土的合理氮肥施用量为0.1750～0.2125g.适宜的氮肥施用量能改善莴苣品质,降低氮肥损失,提高氮肥利用率.
To rationalize nitrogen application aiming at high yield,good quality,low pollution and high nitrogen use efficiency effects of nitrogen rates on yield and quality and nitrogen use efficiency of asparagus lettuce were studied by way of using N trace technique in pot experiment.The results showed that the correlation between nitrogen rates and 15 yield of Asparagus lettuce followed regression equation ?=104.21+2 476.31x-5 181.97x2 indicating yield increased and decreased in order accompanied by the increasing of nitrogen application;the adequate nitrogen rates could improve quality of asparagus lettuce,reduce nitrogen loss and increase nitrogen use efficiency.Adequate nitrogen rates for asparagus lettuce growth ranged from 0.175 0 to 0.212 5 g/kg.
出处
《湖南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2005年第1期47-49,共3页
Journal of Hunan Agricultural University(Natural Sciences)
基金
湖南省科技厅重点项目(04NK2006)
关键词
氮肥施用量
莴苣
产量
品质
氮肥利用率
nitrogen rates
asparagus lettuce
yield
quality
nitrogen use efficiency
