摘要
在设施栽培条件下,采用田间多点位微区试验,研究莴苣、芹菜和生菜3种蔬菜氮肥的当季利用与损失。结果表明:3种蔬菜氮肥施用量在习惯施氮量的基础上减少25%,氮肥当季利用率增加,植株总吸氮量中来自于氮肥的比例降低。经过莴苣、芹菜和生菜一季的吸收,0～20 cm土层氮肥残留显著高于20 cm以下各土层当季氮肥残留。在莴苣种植系统中氮肥有23.90%～31.15%损失,在芹菜种植系统中氮肥有18.69%～27.71%损失,生菜种植系统中氮肥损失低于15%。
The utilization and loss of chemical nitrogen fertilizer in soil-vegetable system were studied by field 15N micro-plot.The results showed that nitrogen use efficiency of asparagus lettuce,celery and leaf lettuce increased with 25% reduction in N fertilizer.The proportion of N derived from fertilizer reduced with 25% reduction in N fertilizer.After the current vegetable harvest,nitrogen residue of 0-20 cm soil was significantly higher than that of below 20 cm.23.9%-31.15% of nitrogen was lost from soil-asparagus lettuce system,18.69%-27.71% of nitrogen was lost from soil-celery system,and less than 15% of nitrogen was lost from soil-leaf lettuce system.
出处
《土壤通报》
CAS
CSCD
北大核心
2011年第6期1446-1450,共5页
Chinese Journal of Soil Science
基金
国家科技部973项目(2002CB410806)
云南省院省校科技合作计划(2006YX35)
中央级公益性科研院所基本科研业务费(农业部环境保护科研监测所)专项资金(2007-aepi-6)资助
关键词
蔬菜
氮利用率
氮素去向15N
Vegetable
Nitrogen utilization
Fate of nitrogen
15N
